diff --git a/src/generator/default/dbmodel.php b/src/generator/default/dbmodel.php
index f8c3ba3c..15c9f722 100644
--- a/src/generator/default/dbmodel.php
+++ b/src/generator/default/dbmodel.php
@@ -146,12 +146,14 @@ public function get<?= $relation->getCamelName() ?>()
 <?php endif;?>
     }
 <?php endforeach; ?>
-<?php $i = 1; foreach ($model->inverseRelations as $relationName => $relation): ?>
+<?php $i = 1; $usedRelationNames = [];
+foreach ($model->belongsToRelations as $relationName => $relation): ?><?php $number = in_array($relation->getCamelName(), $usedRelationNames) ? $i : '' ?>
 
-    public function get<?= $relation->getCamelName().($i===1 ? '' : $i) ?>()
+    # belongs to relation
+    public function get<?= $relation->getCamelName() . ($number) ?>()
     {
         return $this-><?= $relation->getMethod() ?>(\<?= trim($relationNamespace, '\\') ?>\<?= $relation->getClassName() ?>::class, <?php
-    echo $relation->linkToString() ?>)->inverseOf('<?= $relation->getInverse() ?>');
+    echo $relation->linkToString() ?>);
     }
-<?php $i++; endforeach; ?>
+<?php $i++; $usedRelationNames[] = $relation->getCamelName(); endforeach; ?>
 }
diff --git a/src/lib/AttributeResolver.php b/src/lib/AttributeResolver.php
index cc41a6fb..0c0c41c9 100644
--- a/src/lib/AttributeResolver.php
+++ b/src/lib/AttributeResolver.php
@@ -37,6 +37,11 @@ class AttributeResolver
      */
     public array $relations = [];
 
+    /**
+     * @var array keys contains class names and value contains array of belongs to relations
+     */
+    public array $belongsToRelations = [];
+
     /**
      * @var NonDbRelation[]|array
      */
@@ -60,11 +65,6 @@ class AttributeResolver
 
     private ?Config $config;
 
-    /**
-     * @var AttributeRelation[]|array
-     */
-    public array $inverseRelations = [];
-
     public function __construct(string $schemaName, ComponentSchema $schema, JunctionSchemas $junctions, ?Config $config = null)
     {
         $this->schemaName = $schemaName;
@@ -232,6 +232,7 @@ protected function resolveProperty(
                   ->setForeignKeyColumnName($property->fkColName)
                   ->setFakerStub($this->guessFakerStub($attribute, $property))
                   ->setTableName($this->componentSchema->resolveTableName($this->schemaName));
+
         if ($property->isReference()) {
             if ($property->isVirtual()) {
                 throw new InvalidDefinitionException('References not supported for virtual attributes');
@@ -277,12 +278,17 @@ protected function resolveProperty(
             $relation->onDeleteFkConstraint = $property->onDeleteFkConstraint;
             if ($property->isRefPointerToSelf()) {
                 $relation->asSelfReference();
+            } else { # belongs to relations https://github.com/php-openapi/yii2-openapi/issues/90
+                $belongsToRelation = Yii::createObject(
+                    AttributeRelation::class,
+                    [$this->schemaName, $this->tableName, $this->schemaName]
+                )
+                    ->asHasOne([$attribute->columnName => $fkProperty->getName()]);
+                $this->belongsToRelations[$property->getRefClassName()][] = $belongsToRelation;
             }
             $this->relations[$property->getName()] = $relation;
-            if (!$property->isRefPointerToSelf()) {
-                $this->addInverseRelation($relatedClassName, $attribute, $property, $fkProperty);
-            }
         }
+
         if (!$property->isReference() && !$property->hasRefItems()) {
             [$min, $max] = $property->guessMinMax();
             $attribute->setIsVirtual($property->isVirtual())
@@ -338,6 +344,7 @@ protected function resolveProperty(
                         ->asHasMany([$foreignPk => $this->componentSchema->getPkName()]);
                 return;
             }
+
             $relatedClassName = $property->getRefClassName();
             $relatedTableName = $property->getRefSchema()->resolveTableName($relatedClassName);
             if ($this->catchManyToMany(
@@ -518,22 +525,4 @@ public static function relationName(string $propertyName, ?string $fkColumnName)
         }
         return $relationName;
     }
-
-    /**
-     * @throws InvalidConfigException
-     */
-    public function addInverseRelation(
-        string $relatedClassName,
-        Attribute $attribute,
-        PropertySchema $property,
-        PropertySchema $fkProperty
-    ): void {
-        $inverseRelation = Yii::createObject(
-            AttributeRelation::class,
-            [$this->schemaName, $this->tableName, $this->schemaName]
-        )
-            ->asHasOne([$attribute->columnName => $fkProperty->getName()]);
-        $inverseRelation->setInverse($property->getName());
-        $this->inverseRelations[$relatedClassName][] = $inverseRelation;
-    }
 }
diff --git a/src/lib/SchemaToDatabase.php b/src/lib/SchemaToDatabase.php
index ccb230a3..14a8ac24 100644
--- a/src/lib/SchemaToDatabase.php
+++ b/src/lib/SchemaToDatabase.php
@@ -94,7 +94,7 @@ public function prepareModels(): array
 
         $openApi = $this->config->getOpenApi();
         $junctions = $this->findJunctionSchemas();
-        foreach ($openApi->components->schemas as $schemaName => $openApiSchema) {
+        foreach ($openApi->components->schemas ?? [] as $schemaName => $openApiSchema) {
             $schema = Yii::createObject(ComponentSchema::class, [$openApiSchema, $schemaName]);
 
             if (!$this->canGenerateModel($schemaName, $schema)) {
@@ -106,18 +106,15 @@ public function prepareModels(): array
             /** @var AttributeResolver $resolver */
             $resolver = Yii::createObject(AttributeResolver::class, [$schemaName, $schema, $junctions, $this->config]);
 
-            // $models[$schemaName] = $resolver->resolve();
             $resolvers[$schemaName] = $resolver;
             $models[$schemaName] = $resolvers[$schemaName]->resolve();
         }
 
-        // handle inverse relation
+        // handle belongs to relation
         foreach ($resolvers as $aResolver) {
-            foreach ($aResolver->inverseRelations as $name => $relations) {
-                foreach ($relations as $relation) {
-                    /** @var AttributeRelation $relation */
-                    $models[$name]->inverseRelations[] = $relation;
-                }
+            foreach ($aResolver->belongsToRelations as $name => $relations) {
+                /** @var AttributeRelation[] $relations */
+                $models[$name]->belongsToRelations = [...$models[$name]->belongsToRelations, ...$relations];
             }
         }
 
@@ -153,7 +150,7 @@ public function findJunctionSchemas(): JunctionSchemas
     {
         $junctions = [];
         $openApi = $this->config->getOpenApi();
-        foreach ($openApi->components->schemas as $schemaName => $openApiSchema) {
+        foreach ($openApi->components->schemas ?? [] as $schemaName => $openApiSchema) {
             /**@var ComponentSchema $schema */
             $schema = Yii::createObject(ComponentSchema::class, [$openApiSchema, $schemaName]);
             if ($schema->isNonDb()) {
diff --git a/src/lib/generators/ControllersGenerator.php b/src/lib/generators/ControllersGenerator.php
index bd749c9f..ea0c73c4 100644
--- a/src/lib/generators/ControllersGenerator.php
+++ b/src/lib/generators/ControllersGenerator.php
@@ -59,7 +59,7 @@ public function generate():CodeFiles
             $controllerPath = $path;
             /**
              * @var RestAction|FractalAction $action
-            **/
+             **/
             $action = $actions[0];
             if ($action->prefix && !empty($action->prefixSettings)) {
                 $controllerNamespace = trim($action->prefixSettings['namespace'], '\\');
@@ -126,15 +126,31 @@ protected function makeCustomController(
         ];
         $reflection->addMethod('checkAccess', $params, AbstractMemberGenerator::FLAG_PUBLIC, '//TODO implement checkAccess');
         foreach ($abstractActions as $action) {
+            $responseHttpStatusCodes = '';
+            foreach ($this->config->getOpenApi()->paths->getPaths()[$action->urlPath]->getOperations() as $verb => $operation) {
+                $codes = array_keys($operation->responses->getResponses());
+
+                $only200OrDefault = false;
+                if ($codes === [200] || $codes === ['default']) {
+                    $only200OrDefault = true;
+                }
+                if (in_array('default', $codes) && in_array(200, $codes) && count($codes) === 2) {
+                    $only200OrDefault = true;
+                }
+
+                if ($verb === strtolower($action->requestMethod) && !$only200OrDefault) {
+                    $responseHttpStatusCodes = implode(', ', $codes);
+                }
+            }
+
             $params = array_map(static function ($param) {
                 return ['name' => $param];
             }, $action->getParamNames());
-
             $reflection->addMethod(
                 $action->actionMethodName,
                 $params,
                 AbstractMemberGenerator::FLAG_PUBLIC,
-                '//TODO implement ' . $action->actionMethodName
+                '//TODO implement ' . $action->actionMethodName . ($responseHttpStatusCodes ? PHP_EOL . '// In order to conform with OpenAPI spec, response of this action must have one of the following HTTP status code: ' . $responseHttpStatusCodes : '')
             );
         }
         $classFileGenerator->setClasses([$reflection]);
diff --git a/src/lib/items/DbModel.php b/src/lib/items/DbModel.php
index fcfa6d40..226acb15 100644
--- a/src/lib/items/DbModel.php
+++ b/src/lib/items/DbModel.php
@@ -67,11 +67,6 @@ class DbModel extends BaseObject
      */
     public array $many2many = [];
 
-    /**
-     * @var array|AttributeRelation[] inverse relations
-     */
-    public array $inverseRelations = [];
-
     public array $junctionCols = [];
 
     /**
@@ -91,9 +86,9 @@ class DbModel extends BaseObject
     public bool $descriptionIsComment = false;
 
     /**
-     * @var array Automatically generated scenarios from the model 'x-scenarios'.
+     * @var AttributeRelation[] belongs to relations
      */
-    private $_scenarios;
+    public array $belongsToRelations = [];
 
     /**
      * @var bool
@@ -103,6 +98,11 @@ class DbModel extends BaseObject
      */
     public $drop = false;
 
+    /**
+     * @var array Automatically generated scenarios from the model 'x-scenarios'.
+     */
+    private $_scenarios;
+
     public function getTableAlias(): string
     {
         return '{{%' . $this->tableName . '}}';
diff --git a/tests/specs/blog/models/base/Category.php b/tests/specs/blog/models/base/Category.php
index 188ec03c..287bdc9f 100644
--- a/tests/specs/blog/models/base/Category.php
+++ b/tests/specs/blog/models/base/Category.php
@@ -39,8 +39,9 @@ public function getPosts()
         return $this->hasMany(\app\models\Post::class, ['category_id' => 'id'])->inverseOf('category');
     }
 
+    # belongs to relation
     public function getPost()
     {
-        return $this->hasOne(\app\models\Post::class, ['category_id' => 'id'])->inverseOf('category');
+        return $this->hasOne(\app\models\Post::class, ['category_id' => 'id']);
     }
 }
diff --git a/tests/specs/blog/models/base/Post.php b/tests/specs/blog/models/base/Post.php
index 633de3f4..2a97d0fa 100644
--- a/tests/specs/blog/models/base/Post.php
+++ b/tests/specs/blog/models/base/Post.php
@@ -62,8 +62,9 @@ public function getComments()
         return $this->hasMany(\app\models\Comment::class, ['post_id' => 'uid'])->inverseOf('post');
     }
 
+    # belongs to relation
     public function getComment()
     {
-        return $this->hasOne(\app\models\Comment::class, ['post_id' => 'uid'])->inverseOf('post');
+        return $this->hasOne(\app\models\Comment::class, ['post_id' => 'uid']);
     }
 }
diff --git a/tests/specs/blog/models/base/User.php b/tests/specs/blog/models/base/User.php
index dbd3a708..557328f9 100644
--- a/tests/specs/blog/models/base/User.php
+++ b/tests/specs/blog/models/base/User.php
@@ -45,13 +45,15 @@ public function rules()
         ];
     }
 
+    # belongs to relation
     public function getPost()
     {
-        return $this->hasOne(\app\models\Post::class, ['created_by_id' => 'id'])->inverseOf('created_by');
+        return $this->hasOne(\app\models\Post::class, ['created_by_id' => 'id']);
     }
 
-    public function getComment2()
+    # belongs to relation
+    public function getComment()
     {
-        return $this->hasOne(\app\models\Comment::class, ['author_id' => 'id'])->inverseOf('author');
+        return $this->hasOne(\app\models\Comment::class, ['author_id' => 'id']);
     }
 }
diff --git a/tests/specs/blog_v2/controllers/CommentController.php b/tests/specs/blog_v2/controllers/CommentController.php
index 0448ec72..c46307ed 100644
--- a/tests/specs/blog_v2/controllers/CommentController.php
+++ b/tests/specs/blog_v2/controllers/CommentController.php
@@ -18,6 +18,7 @@ public function actionListForPost($postId)
     public function actionCreateForPost($postId)
     {
         //TODO implement actionCreateForPost
+        // In order to conform with OpenAPI spec, response of this action must have one of the following HTTP status code: 201, default
     }
 
     public function actionViewForPost($slug, $id)
@@ -28,6 +29,7 @@ public function actionViewForPost($slug, $id)
     public function actionDeleteForPost($slug, $id)
     {
         //TODO implement actionDeleteForPost
+        // In order to conform with OpenAPI spec, response of this action must have one of the following HTTP status code: 204
     }
 
     public function actionUpdateForPost($slug, $id)
diff --git a/tests/specs/blog_v2/models/base/Category.php b/tests/specs/blog_v2/models/base/Category.php
index 4207f516..1b97af75 100644
--- a/tests/specs/blog_v2/models/base/Category.php
+++ b/tests/specs/blog_v2/models/base/Category.php
@@ -39,8 +39,9 @@ public function getPosts()
         return $this->hasMany(\app\models\Post::class, ['category_id' => 'id'])->inverseOf('category');
     }
 
+    # belongs to relation
     public function getPost()
     {
-        return $this->hasOne(\app\models\Post::class, ['category_id' => 'id'])->inverseOf('category');
+        return $this->hasOne(\app\models\Post::class, ['category_id' => 'id']);
     }
 }
diff --git a/tests/specs/blog_v2/models/base/Post.php b/tests/specs/blog_v2/models/base/Post.php
index debc5008..0b82cefc 100644
--- a/tests/specs/blog_v2/models/base/Post.php
+++ b/tests/specs/blog_v2/models/base/Post.php
@@ -74,8 +74,9 @@ public function getTags()
                     ->viaTable('posts2tags', ['post_id' => 'id']);
     }
 
+    # belongs to relation
     public function getComment()
     {
-        return $this->hasOne(\app\models\Comment::class, ['post_id' => 'id'])->inverseOf('post');
+        return $this->hasOne(\app\models\Comment::class, ['post_id' => 'id']);
     }
 }
diff --git a/tests/specs/blog_v2/models/base/User.php b/tests/specs/blog_v2/models/base/User.php
index 45c5b4e0..820b8259 100644
--- a/tests/specs/blog_v2/models/base/User.php
+++ b/tests/specs/blog_v2/models/base/User.php
@@ -48,13 +48,15 @@ public function rules()
         ];
     }
 
+    # belongs to relation
     public function getPost()
     {
-        return $this->hasOne(\app\models\Post::class, ['created_by_id' => 'id'])->inverseOf('created_by');
+        return $this->hasOne(\app\models\Post::class, ['created_by_id' => 'id']);
     }
 
-    public function getComment2()
+    # belongs to relation
+    public function getComment()
     {
-        return $this->hasOne(\app\models\Comment::class, ['user_id' => 'id'])->inverseOf('user');
+        return $this->hasOne(\app\models\Comment::class, ['user_id' => 'id']);
     }
 }
diff --git a/tests/specs/fk_col_name/app/models/base/Delivery.php b/tests/specs/fk_col_name/app/models/base/Delivery.php
index 75a64400..3bb543a1 100644
--- a/tests/specs/fk_col_name/app/models/base/Delivery.php
+++ b/tests/specs/fk_col_name/app/models/base/Delivery.php
@@ -28,8 +28,9 @@ public function rules()
         ];
     }
 
+    # belongs to relation
     public function getWebhook()
     {
-        return $this->hasOne(\app\models\Webhook::class, ['redelivery_of' => 'id'])->inverseOf('redelivery_of');
+        return $this->hasOne(\app\models\Webhook::class, ['redelivery_of' => 'id']);
     }
 }
diff --git a/tests/specs/fk_col_name/app/models/base/User.php b/tests/specs/fk_col_name/app/models/base/User.php
index ede2e7c0..7847f799 100644
--- a/tests/specs/fk_col_name/app/models/base/User.php
+++ b/tests/specs/fk_col_name/app/models/base/User.php
@@ -29,8 +29,9 @@ public function rules()
         ];
     }
 
+    # belongs to relation
     public function getWebhook()
     {
-        return $this->hasOne(\app\models\Webhook::class, ['user_id' => 'id'])->inverseOf('user');
+        return $this->hasOne(\app\models\Webhook::class, ['user_id' => 'id']);
     }
 }
diff --git a/tests/specs/fk_col_name_index/app/models/base/Delivery.php b/tests/specs/fk_col_name_index/app/models/base/Delivery.php
index a17531d1..98b9c801 100644
--- a/tests/specs/fk_col_name_index/app/models/base/Delivery.php
+++ b/tests/specs/fk_col_name_index/app/models/base/Delivery.php
@@ -28,13 +28,15 @@ public function rules()
         ];
     }
 
+    # belongs to relation
     public function getWebhook()
     {
-        return $this->hasOne(\app\models\Webhook::class, ['redelivery_of' => 'id'])->inverseOf('redelivery_of');
+        return $this->hasOne(\app\models\Webhook::class, ['redelivery_of' => 'id']);
     }
 
+    # belongs to relation
     public function getWebhook2()
     {
-        return $this->hasOne(\app\models\Webhook::class, ['rd_abc_2' => 'id'])->inverseOf('rd2');
+        return $this->hasOne(\app\models\Webhook::class, ['rd_abc_2' => 'id']);
     }
 }
diff --git a/tests/specs/fk_col_name_index/app/models/base/User.php b/tests/specs/fk_col_name_index/app/models/base/User.php
index ede2e7c0..7847f799 100644
--- a/tests/specs/fk_col_name_index/app/models/base/User.php
+++ b/tests/specs/fk_col_name_index/app/models/base/User.php
@@ -29,8 +29,9 @@ public function rules()
         ];
     }
 
+    # belongs to relation
     public function getWebhook()
     {
-        return $this->hasOne(\app\models\Webhook::class, ['user_id' => 'id'])->inverseOf('user');
+        return $this->hasOne(\app\models\Webhook::class, ['user_id' => 'id']);
     }
 }
diff --git a/tests/specs/issue_fix/159_bug_giiapi_generated_rules_emailid/maria/models/base/Mailing.php b/tests/specs/issue_fix/159_bug_giiapi_generated_rules_emailid/maria/models/base/Mailing.php
index 57bb103f..2639a486 100644
--- a/tests/specs/issue_fix/159_bug_giiapi_generated_rules_emailid/maria/models/base/Mailing.php
+++ b/tests/specs/issue_fix/159_bug_giiapi_generated_rules_emailid/maria/models/base/Mailing.php
@@ -31,8 +31,9 @@ public function rules()
         ];
     }
 
+    # belongs to relation
     public function getContact()
     {
-        return $this->hasOne(\app\models\Contact::class, ['mailing_id' => 'id'])->inverseOf('mailing');
+        return $this->hasOne(\app\models\Contact::class, ['mailing_id' => 'id']);
     }
 }
diff --git a/tests/specs/issue_fix/162_bug_dollarref_with_x_faker/app/models/base/Invoice.php b/tests/specs/issue_fix/162_bug_dollarref_with_x_faker/app/models/base/Invoice.php
index cf4c0f73..1f685781 100644
--- a/tests/specs/issue_fix/162_bug_dollarref_with_x_faker/app/models/base/Invoice.php
+++ b/tests/specs/issue_fix/162_bug_dollarref_with_x_faker/app/models/base/Invoice.php
@@ -24,8 +24,9 @@ public function rules()
         return [];
     }
 
+    # belongs to relation
     public function getOrder()
     {
-        return $this->hasOne(\app\models\Order::class, ['invoice_id' => 'id'])->inverseOf('invoice');
+        return $this->hasOne(\app\models\Order::class, ['invoice_id' => 'id']);
     }
 }
diff --git a/tests/specs/issue_fix/163_generator_crash_when_using_reference_inside_an_object/pgsql/controllers/ContactController.php b/tests/specs/issue_fix/163_generator_crash_when_using_reference_inside_an_object/pgsql/controllers/ContactController.php
index 10422b18..5f21cabb 100644
--- a/tests/specs/issue_fix/163_generator_crash_when_using_reference_inside_an_object/pgsql/controllers/ContactController.php
+++ b/tests/specs/issue_fix/163_generator_crash_when_using_reference_inside_an_object/pgsql/controllers/ContactController.php
@@ -13,11 +13,13 @@ public function checkAccess($action, $model = null, $params = [])
     public function actionListForAccount($accountId)
     {
         //TODO implement actionListForAccount
+        // In order to conform with OpenAPI spec, response of this action must have one of the following HTTP status code: 200, 403
     }
 
     public function actionViewForAccount($accountId, $contactId)
     {
         //TODO implement actionViewForAccount
+        // In order to conform with OpenAPI spec, response of this action must have one of the following HTTP status code: 200, 403
     }
 
 
diff --git a/tests/specs/issue_fix/175_bug_allof_with_multiple_dollarrefs/pgsql/controllers/AccountController.php b/tests/specs/issue_fix/175_bug_allof_with_multiple_dollarrefs/pgsql/controllers/AccountController.php
index b4044b8f..cfa4a6d3 100644
--- a/tests/specs/issue_fix/175_bug_allof_with_multiple_dollarrefs/pgsql/controllers/AccountController.php
+++ b/tests/specs/issue_fix/175_bug_allof_with_multiple_dollarrefs/pgsql/controllers/AccountController.php
@@ -13,6 +13,7 @@ public function checkAccess($action, $model = null, $params = [])
     public function actionView($id)
     {
         //TODO implement actionView
+        // In order to conform with OpenAPI spec, response of this action must have one of the following HTTP status code: 200, 404
     }
 
 
diff --git a/tests/specs/issue_fix/175_bug_allof_with_multiple_dollarrefs/pgsql/models/base/Account.php b/tests/specs/issue_fix/175_bug_allof_with_multiple_dollarrefs/pgsql/models/base/Account.php
index cd597631..079b93b9 100644
--- a/tests/specs/issue_fix/175_bug_allof_with_multiple_dollarrefs/pgsql/models/base/Account.php
+++ b/tests/specs/issue_fix/175_bug_allof_with_multiple_dollarrefs/pgsql/models/base/Account.php
@@ -31,8 +31,9 @@ public function rules()
         ];
     }
 
+    # belongs to relation
     public function getContact()
     {
-        return $this->hasOne(\app\models\Contact::class, ['account_id' => 'id'])->inverseOf('account');
+        return $this->hasOne(\app\models\Contact::class, ['account_id' => 'id']);
     }
 }
diff --git a/tests/specs/issue_fix/25_generate_inverse_relations/mysql/models/base/User.php b/tests/specs/issue_fix/25_generate_inverse_relations/mysql/models/base/User.php
index 7e26bb25..c1b63234 100644
--- a/tests/specs/issue_fix/25_generate_inverse_relations/mysql/models/base/User.php
+++ b/tests/specs/issue_fix/25_generate_inverse_relations/mysql/models/base/User.php
@@ -35,18 +35,21 @@ public function getAccounts()
         return $this->hasMany(\app\models\Account::class, ['user_id' => 'id'])->inverseOf('user');
     }
 
+    # belongs to relation
     public function getAccount()
     {
-        return $this->hasOne(\app\models\Account::class, ['user_id' => 'id'])->inverseOf('user');
+        return $this->hasOne(\app\models\Account::class, ['user_id' => 'id']);
     }
 
+    # belongs to relation
     public function getAccount2()
     {
-        return $this->hasOne(\app\models\Account::class, ['user2_id' => 'id'])->inverseOf('user2');
+        return $this->hasOne(\app\models\Account::class, ['user2_id' => 'id']);
     }
 
+    # belongs to relation
     public function getAccount3()
     {
-        return $this->hasOne(\app\models\Account::class, ['user3' => 'id'])->inverseOf('user3');
+        return $this->hasOne(\app\models\Account::class, ['user3' => 'id']);
     }
 }
diff --git a/tests/specs/issue_fix/29_extension_fk_column_name_cause_error_in_case_of_column_name_without_underscore/mysql/models/base/User.php b/tests/specs/issue_fix/29_extension_fk_column_name_cause_error_in_case_of_column_name_without_underscore/mysql/models/base/User.php
index 390d8bdb..547aa903 100644
--- a/tests/specs/issue_fix/29_extension_fk_column_name_cause_error_in_case_of_column_name_without_underscore/mysql/models/base/User.php
+++ b/tests/specs/issue_fix/29_extension_fk_column_name_cause_error_in_case_of_column_name_without_underscore/mysql/models/base/User.php
@@ -28,8 +28,9 @@ public function rules()
         ];
     }
 
+    # belongs to relation
     public function getPost()
     {
-        return $this->hasOne(\app\models\Post::class, ['user' => 'id'])->inverseOf('user');
+        return $this->hasOne(\app\models\Post::class, ['user' => 'id']);
     }
 }
diff --git a/tests/specs/issue_fix/52_bug_dependenton_allof_with_x_faker_false/mysql/models/base/Animal.php b/tests/specs/issue_fix/52_bug_dependenton_allof_with_x_faker_false/mysql/models/base/Animal.php
index 81e157ac..bfd317f7 100644
--- a/tests/specs/issue_fix/52_bug_dependenton_allof_with_x_faker_false/mysql/models/base/Animal.php
+++ b/tests/specs/issue_fix/52_bug_dependenton_allof_with_x_faker_false/mysql/models/base/Animal.php
@@ -28,8 +28,9 @@ public function rules()
         ];
     }
 
+    # belongs to relation
     public function getInvoice()
     {
-        return $this->hasOne(\app\models\Invoice::class, ['animal_id' => 'id'])->inverseOf('animal');
+        return $this->hasOne(\app\models\Invoice::class, ['animal_id' => 'id']);
     }
 }
diff --git a/tests/specs/issue_fix/52_bug_dependenton_allof_with_x_faker_false/mysql/models/base/Fruit.php b/tests/specs/issue_fix/52_bug_dependenton_allof_with_x_faker_false/mysql/models/base/Fruit.php
index d56f106c..ab5c4054 100644
--- a/tests/specs/issue_fix/52_bug_dependenton_allof_with_x_faker_false/mysql/models/base/Fruit.php
+++ b/tests/specs/issue_fix/52_bug_dependenton_allof_with_x_faker_false/mysql/models/base/Fruit.php
@@ -28,8 +28,9 @@ public function rules()
         ];
     }
 
+    # belongs to relation
     public function getInvoice()
     {
-        return $this->hasOne(\app\models\Invoice::class, ['fruit_id' => 'id'])->inverseOf('fruit');
+        return $this->hasOne(\app\models\Invoice::class, ['fruit_id' => 'id']);
     }
 }
diff --git a/tests/specs/issue_fix/52_bug_dependenton_allof_with_x_faker_false/mysql/models/base/User.php b/tests/specs/issue_fix/52_bug_dependenton_allof_with_x_faker_false/mysql/models/base/User.php
index a6ce6e79..c132c14b 100644
--- a/tests/specs/issue_fix/52_bug_dependenton_allof_with_x_faker_false/mysql/models/base/User.php
+++ b/tests/specs/issue_fix/52_bug_dependenton_allof_with_x_faker_false/mysql/models/base/User.php
@@ -28,13 +28,15 @@ public function rules()
         ];
     }
 
+    # belongs to relation
     public function getInvoice()
     {
-        return $this->hasOne(\app\models\Invoice::class, ['user_id' => 'id'])->inverseOf('user');
+        return $this->hasOne(\app\models\Invoice::class, ['user_id' => 'id']);
     }
 
+    # belongs to relation
     public function getInvoice2()
     {
-        return $this->hasOne(\app\models\Invoice::class, ['user_2_id' => 'id'])->inverseOf('user_2');
+        return $this->hasOne(\app\models\Invoice::class, ['user_2_id' => 'id']);
     }
 }
diff --git a/tests/specs/issue_fix/78_properties_that_are_marked_as_readonly_are_not_read_only/index.php b/tests/specs/issue_fix/78_properties_that_are_marked_as_readonly_are_not_read_only/index.php
new file mode 100644
index 00000000..9a6fa0f2
--- /dev/null
+++ b/tests/specs/issue_fix/78_properties_that_are_marked_as_readonly_are_not_read_only/index.php
@@ -0,0 +1,13 @@
+<?php
+
+return [
+    'openApiPath' => '@specs/issue_fix/78_properties_that_are_marked_as_readonly_are_not_read_only/index.yaml',
+    'generateUrls' => false,
+    'generateModels' => true,
+    'excludeModels' => [
+        'Error',
+    ],
+    'generateControllers' => false,
+    'generateMigrations' => false,
+    'generateModelFaker' => true, // `generateModels` must be `true` in order to use `generateModelFaker` as `true`
+];
diff --git a/tests/specs/issue_fix/78_properties_that_are_marked_as_readonly_are_not_read_only/index.yaml b/tests/specs/issue_fix/78_properties_that_are_marked_as_readonly_are_not_read_only/index.yaml
new file mode 100644
index 00000000..8f748b8e
--- /dev/null
+++ b/tests/specs/issue_fix/78_properties_that_are_marked_as_readonly_are_not_read_only/index.yaml
@@ -0,0 +1,24 @@
+openapi: 3.0.3
+
+info:
+  title: '#78'
+  version: 1.0.0
+
+paths:
+  /:
+    get:
+      responses:
+        '200':
+          description: The Response
+
+components:
+  schemas:
+    Payment:
+      properties:
+        id:
+          type: integer
+        amount:
+          type: integer
+          readOnly: true
+        currency:
+          type: string
diff --git a/tests/specs/issue_fix/78_properties_that_are_marked_as_readonly_are_not_read_only/mysql/models/BaseModelFaker.php b/tests/specs/issue_fix/78_properties_that_are_marked_as_readonly_are_not_read_only/mysql/models/BaseModelFaker.php
new file mode 100644
index 00000000..c367fbb4
--- /dev/null
+++ b/tests/specs/issue_fix/78_properties_that_are_marked_as_readonly_are_not_read_only/mysql/models/BaseModelFaker.php
@@ -0,0 +1,144 @@
+<?php
+
+namespace app\models;
+
+use Faker\Factory as FakerFactory;
+use Faker\Generator;
+use Faker\UniqueGenerator;
+
+/**
+ * Base fake data generator
+ */
+abstract class BaseModelFaker
+{
+    /**
+     * @var Generator
+    */
+    protected $faker;
+    /**
+     * @var UniqueGenerator
+    */
+    protected $uniqueFaker;
+
+    public function __construct()
+    {
+        $this->faker = FakerFactory::create(str_replace('-', '_', \Yii::$app->language));
+        $this->uniqueFaker = new UniqueGenerator($this->faker);
+    }
+
+    abstract public function generateModel($attributes = []);
+
+    public function getFaker():Generator
+    {
+        return $this->faker;
+    }
+
+    public function getUniqueFaker():UniqueGenerator
+    {
+        return $this->uniqueFaker;
+    }
+
+    public function setFaker(Generator $faker):void
+    {
+        $this->faker = $faker;
+    }
+
+    public function setUniqueFaker(UniqueGenerator $faker):void
+    {
+        $this->uniqueFaker = $faker;
+    }
+
+    /**
+     * Generate and return model
+     * @param array|callable $attributes
+     * @param UniqueGenerator|null $uniqueFaker
+     * @return \yii\db\ActiveRecord
+     * @example MyFaker::makeOne(['user_id' => 1, 'title' => 'foo']);
+     * @example MyFaker::makeOne( function($model, $faker) {
+     *        $model->scenario = 'create';
+     *        $model->setAttributes(['user_id' => 1, 'title' => $faker->sentence]);
+     *        return $model;
+     *  });
+     */
+    public static function makeOne($attributes = [], ?UniqueGenerator $uniqueFaker = null)
+    {
+        $fakeBuilder = new static();
+        if ($uniqueFaker !== null) {
+            $fakeBuilder->setUniqueFaker($uniqueFaker);
+        }
+        $model = $fakeBuilder->generateModel($attributes);
+        return $model;
+    }
+
+    /**
+     * Generate, save and return model
+     * @param array|callable $attributes
+     * @param UniqueGenerator|null $uniqueFaker
+     * @return \yii\db\ActiveRecord
+     * @example MyFaker::saveOne(['user_id' => 1, 'title' => 'foo']);
+     * @example MyFaker::saveOne( function($model, $faker) {
+     *        $model->scenario = 'create';
+     *        $model->setAttributes(['user_id' => 1, 'title' => $faker->sentence]);
+     *        return $model;
+     *  });
+     */
+    public static function saveOne($attributes = [], ?UniqueGenerator $uniqueFaker = null)
+    {
+        $model = static::makeOne($attributes, $uniqueFaker);
+        $model->save();
+        return $model;
+    }
+
+    /**
+     * Generate and return multiple models
+     * @param int $number
+     * @param array|callable $commonAttributes
+     * @return \yii\db\ActiveRecord[]|array
+     * @example TaskFaker::make(5, ['project_id'=>1, 'user_id' => 2]);
+     * @example TaskFaker::make(5, function($model, $faker, $uniqueFaker) {
+     *       $model->setAttributes(['name' => $uniqueFaker->username, 'state'=>$faker->boolean(20)]);
+     *       return $model;
+     * });
+     */
+    public static function make(int $number, $commonAttributes = [], ?UniqueGenerator $uniqueFaker = null):array
+    {
+        if ($number < 1) {
+            return [];
+        }
+        $fakeBuilder = new static();
+        if ($uniqueFaker !== null) {
+            $fakeBuilder->setUniqueFaker($uniqueFaker);
+        }
+        return array_map(function () use ($commonAttributes, $fakeBuilder) {
+            $model = $fakeBuilder->generateModel($commonAttributes);
+            return $model;
+        }, range(0, $number -1));
+    }
+
+    /**
+     * Generate, save and return multiple models
+     * @param int $number
+     * @param array|callable $commonAttributes
+     * @return \yii\db\ActiveRecord[]|array
+     * @example TaskFaker::save(5, ['project_id'=>1, 'user_id' => 2]);
+     * @example TaskFaker::save(5, function($model, $faker, $uniqueFaker) {
+     *       $model->setAttributes(['name' => $uniqueFaker->username, 'state'=>$faker->boolean(20)]);
+     *       return $model;
+     * });
+     */
+    public static function save(int $number, $commonAttributes = [], ?UniqueGenerator $uniqueFaker = null):array
+    {
+        if ($number < 1) {
+            return [];
+        }
+        $fakeBuilder = new static();
+        if ($uniqueFaker !== null) {
+            $fakeBuilder->setUniqueFaker($uniqueFaker);
+        }
+        return array_map(function () use ($commonAttributes, $fakeBuilder) {
+            $model = $fakeBuilder->generateModel($commonAttributes);
+            $model->save();
+            return $model;
+        }, range(0, $number -1));
+    }
+}
diff --git a/tests/specs/issue_fix/78_properties_that_are_marked_as_readonly_are_not_read_only/mysql/models/Payment.php b/tests/specs/issue_fix/78_properties_that_are_marked_as_readonly_are_not_read_only/mysql/models/Payment.php
new file mode 100644
index 00000000..660670f4
--- /dev/null
+++ b/tests/specs/issue_fix/78_properties_that_are_marked_as_readonly_are_not_read_only/mysql/models/Payment.php
@@ -0,0 +1,10 @@
+<?php
+
+namespace app\models;
+
+class Payment extends \app\models\base\Payment
+{
+
+
+}
+
diff --git a/tests/specs/issue_fix/78_properties_that_are_marked_as_readonly_are_not_read_only/mysql/models/PaymentFaker.php b/tests/specs/issue_fix/78_properties_that_are_marked_as_readonly_are_not_read_only/mysql/models/PaymentFaker.php
new file mode 100644
index 00000000..d2f22af6
--- /dev/null
+++ b/tests/specs/issue_fix/78_properties_that_are_marked_as_readonly_are_not_read_only/mysql/models/PaymentFaker.php
@@ -0,0 +1,42 @@
+<?php
+namespace app\models;
+
+use Faker\UniqueGenerator;
+
+/**
+ * Fake data generator for Payment
+ * @method static Payment makeOne($attributes = [], ?UniqueGenerator $uniqueFaker = null);
+ * @method static Payment saveOne($attributes = [], ?UniqueGenerator $uniqueFaker = null);
+ * @method static Payment[] make(int $number, $commonAttributes = [], ?UniqueGenerator $uniqueFaker = null)
+ * @method static Payment[] save(int $number, $commonAttributes = [], ?UniqueGenerator $uniqueFaker = null)
+ */
+class PaymentFaker extends BaseModelFaker
+{
+
+    /**
+     * @param array|callable $attributes
+     * @return Payment|\yii\db\ActiveRecord
+     * @example
+     *  $model = (new PostFaker())->generateModels(['author_id' => 1]);
+     *  $model = (new PostFaker())->generateModels(function($model, $faker, $uniqueFaker) {
+     *            $model->scenario = 'create';
+     *            $model->author_id = 1;
+     *            return $model;
+     *  });
+    **/
+    public function generateModel($attributes = [])
+    {
+        $faker = $this->faker;
+        $uniqueFaker = $this->uniqueFaker;
+        $model = new Payment();
+        //$model->id = $uniqueFaker->numberBetween(0, 1000000);
+        $model->amount = $faker->numberBetween(0, 1000000);
+        $model->currency = $faker->currencyCode;
+        if (!is_callable($attributes)) {
+            $model->setAttributes($attributes, false);
+        } else {
+            $model = $attributes($model, $faker, $uniqueFaker);
+        }
+        return $model;
+    }
+}
diff --git a/tests/specs/issue_fix/78_properties_that_are_marked_as_readonly_are_not_read_only/mysql/models/base/Payment.php b/tests/specs/issue_fix/78_properties_that_are_marked_as_readonly_are_not_read_only/mysql/models/base/Payment.php
new file mode 100644
index 00000000..129cce90
--- /dev/null
+++ b/tests/specs/issue_fix/78_properties_that_are_marked_as_readonly_are_not_read_only/mysql/models/base/Payment.php
@@ -0,0 +1,31 @@
+<?php
+
+/**
+ * This file is generated by Gii, do not change manually!
+ */
+
+namespace app\models\base;
+
+/**
+ * This is the model class for table "payments".
+ *
+ * @property int $id
+ * @property int $amount
+ * @property string $currency
+ *
+ */
+abstract class Payment extends \yii\db\ActiveRecord
+{
+    public static function tableName()
+    {
+        return '{{%payments}}';
+    }
+
+    public function rules()
+    {
+        return [
+            'trim' => [['currency'], 'trim'],
+            'currency_string' => [['currency'], 'string'],
+        ];
+    }
+}
diff --git a/tests/specs/issue_fix/79_response_status_codes_are_not_the_codes_defined_in_spec/index.php b/tests/specs/issue_fix/79_response_status_codes_are_not_the_codes_defined_in_spec/index.php
new file mode 100644
index 00000000..cf88e27a
--- /dev/null
+++ b/tests/specs/issue_fix/79_response_status_codes_are_not_the_codes_defined_in_spec/index.php
@@ -0,0 +1,13 @@
+<?php
+
+return [
+    'openApiPath' => '@specs/issue_fix/79_response_status_codes_are_not_the_codes_defined_in_spec/index.yml',
+    'generateUrls' => false,
+    'generateModels' => false,
+    'excludeModels' => [
+        'Error',
+    ],
+    'generateControllers' => true,
+    'generateMigrations' => false,
+    'generateModelFaker' => false,
+];
diff --git a/tests/specs/issue_fix/79_response_status_codes_are_not_the_codes_defined_in_spec/index.yml b/tests/specs/issue_fix/79_response_status_codes_are_not_the_codes_defined_in_spec/index.yml
new file mode 100644
index 00000000..df5b1314
--- /dev/null
+++ b/tests/specs/issue_fix/79_response_status_codes_are_not_the_codes_defined_in_spec/index.yml
@@ -0,0 +1,36 @@
+openapi: "3.0.0"
+info:
+  version: 1.0.0
+  title: 79_response_status_codes_are_not_the_codes_defined_in_spec
+paths:
+  /mango/cake:
+    get:
+      responses:
+        '200':
+          description: The information
+        '403':
+          description: The information
+        '404':
+          description: The information
+    post:
+      responses:
+        '201':
+          description: The information
+        '403':
+          description: The information
+        '404':
+          description: The information
+        '422':
+          description: The information
+
+components:
+  schemas:
+    Address:
+      type: object
+      description: desc
+      properties:
+        id:
+          type: integer
+        name:
+          type: string
+          maxLength: 64
diff --git a/tests/specs/issue_fix/79_response_status_codes_are_not_the_codes_defined_in_spec/mysql/controllers/MangoController.php b/tests/specs/issue_fix/79_response_status_codes_are_not_the_codes_defined_in_spec/mysql/controllers/MangoController.php
new file mode 100644
index 00000000..46c40ad1
--- /dev/null
+++ b/tests/specs/issue_fix/79_response_status_codes_are_not_the_codes_defined_in_spec/mysql/controllers/MangoController.php
@@ -0,0 +1,27 @@
+<?php
+
+namespace app\controllers;
+
+class MangoController extends \app\controllers\base\MangoController
+{
+
+    public function checkAccess($action, $model = null, $params = [])
+    {
+        //TODO implement checkAccess
+    }
+
+    public function actionCake()
+    {
+        //TODO implement actionCake
+        // In order to conform with OpenAPI spec, response of this action must have one of the following HTTP status code: 200, 403, 404
+    }
+
+    public function actionCreateCake()
+    {
+        //TODO implement actionCreateCake
+        // In order to conform with OpenAPI spec, response of this action must have one of the following HTTP status code: 201, 403, 404, 422
+    }
+
+
+}
+
diff --git a/tests/specs/issue_fix/79_response_status_codes_are_not_the_codes_defined_in_spec/mysql/controllers/base/MangoController.php b/tests/specs/issue_fix/79_response_status_codes_are_not_the_codes_defined_in_spec/mysql/controllers/base/MangoController.php
new file mode 100644
index 00000000..8962c319
--- /dev/null
+++ b/tests/specs/issue_fix/79_response_status_codes_are_not_the_codes_defined_in_spec/mysql/controllers/base/MangoController.php
@@ -0,0 +1,34 @@
+<?php
+
+namespace app\controllers\base;
+
+abstract class MangoController extends \yii\rest\Controller
+{
+    public function actions()
+    {
+        return [
+            'options' => [
+                'class' => \yii\rest\OptionsAction::class,
+            ],
+        ];
+    }
+
+    /**
+     * Checks the privilege of the current user.
+     *
+     * This method checks whether the current user has the privilege
+     * to run the specified action against the specified data model.
+     * If the user does not have access, a [[ForbiddenHttpException]] should be thrown.
+     *
+     * @param string $action the ID of the action to be executed
+     * @param object $model the model to be accessed. If null, it means no specific model is being accessed.
+     * @param array $params additional parameters
+     * @throws \yii\web\ForbiddenHttpException if the user does not have access
+     */
+    abstract public function checkAccess($action, $model = null, $params = []);
+
+    abstract public function actionCake();
+
+    abstract public function actionCreateCake();
+
+}
diff --git a/tests/specs/issue_fix/88_in_case_of_updating_a_model_generator_creates_redundant_inverse_relations/index.php b/tests/specs/issue_fix/88_in_case_of_updating_a_model_generator_creates_redundant_inverse_relations/index.php
new file mode 100644
index 00000000..59eb14b0
--- /dev/null
+++ b/tests/specs/issue_fix/88_in_case_of_updating_a_model_generator_creates_redundant_inverse_relations/index.php
@@ -0,0 +1,13 @@
+<?php
+
+return [
+    'openApiPath' => '@specs/issue_fix/88_in_case_of_updating_a_model_generator_creates_redundant_inverse_relations/index.yaml',
+    'generateUrls' => false,
+    'generateModels' => true,
+    'excludeModels' => [
+        'Error',
+    ],
+    'generateControllers' => false,
+    'generateMigrations' => false,
+    'generateModelFaker' => false, // `generateModels` must be `true` in order to use `generateModelFaker` as `true`
+];
diff --git a/tests/specs/issue_fix/88_in_case_of_updating_a_model_generator_creates_redundant_inverse_relations/index.yaml b/tests/specs/issue_fix/88_in_case_of_updating_a_model_generator_creates_redundant_inverse_relations/index.yaml
new file mode 100644
index 00000000..8acbf164
--- /dev/null
+++ b/tests/specs/issue_fix/88_in_case_of_updating_a_model_generator_creates_redundant_inverse_relations/index.yaml
@@ -0,0 +1,31 @@
+openapi: "3.0.0"
+
+info:
+  version: 1.0.0
+  title: '#88'
+
+paths:
+  /:
+    get:
+      responses:
+        '200':
+          description: The response
+
+components:
+  schemas:
+    Address:
+      type: object
+      properties:
+        id:
+          type: integer
+        name:
+          type: string
+    Human:
+      type: object
+      properties:
+        id:
+          type: integer
+        name:
+          type: string
+        address:
+          $ref: '#/components/schemas/Address'
diff --git a/tests/specs/issue_fix/88_in_case_of_updating_a_model_generator_creates_redundant_inverse_relations/mysql/models/Address.php b/tests/specs/issue_fix/88_in_case_of_updating_a_model_generator_creates_redundant_inverse_relations/mysql/models/Address.php
new file mode 100644
index 00000000..abfd7d59
--- /dev/null
+++ b/tests/specs/issue_fix/88_in_case_of_updating_a_model_generator_creates_redundant_inverse_relations/mysql/models/Address.php
@@ -0,0 +1,10 @@
+<?php
+
+namespace app\models;
+
+class Address extends \app\models\base\Address
+{
+
+
+}
+
diff --git a/tests/specs/issue_fix/88_in_case_of_updating_a_model_generator_creates_redundant_inverse_relations/mysql/models/Human.php b/tests/specs/issue_fix/88_in_case_of_updating_a_model_generator_creates_redundant_inverse_relations/mysql/models/Human.php
new file mode 100644
index 00000000..06817db9
--- /dev/null
+++ b/tests/specs/issue_fix/88_in_case_of_updating_a_model_generator_creates_redundant_inverse_relations/mysql/models/Human.php
@@ -0,0 +1,10 @@
+<?php
+
+namespace app\models;
+
+class Human extends \app\models\base\Human
+{
+
+
+}
+
diff --git a/tests/specs/issue_fix/88_in_case_of_updating_a_model_generator_creates_redundant_inverse_relations/mysql/models/base/Address.php b/tests/specs/issue_fix/88_in_case_of_updating_a_model_generator_creates_redundant_inverse_relations/mysql/models/base/Address.php
new file mode 100644
index 00000000..e42f43c1
--- /dev/null
+++ b/tests/specs/issue_fix/88_in_case_of_updating_a_model_generator_creates_redundant_inverse_relations/mysql/models/base/Address.php
@@ -0,0 +1,36 @@
+<?php
+
+/**
+ * This file is generated by Gii, do not change manually!
+ */
+
+namespace app\models\base;
+
+/**
+ * This is the model class for table "addresses".
+ *
+ * @property int $id
+ * @property string $name
+ *
+ */
+abstract class Address extends \yii\db\ActiveRecord
+{
+    public static function tableName()
+    {
+        return '{{%addresses}}';
+    }
+
+    public function rules()
+    {
+        return [
+            'trim' => [['name'], 'trim'],
+            'name_string' => [['name'], 'string'],
+        ];
+    }
+
+    # belongs to relation
+    public function getHuman()
+    {
+        return $this->hasOne(\app\models\Human::class, ['address_id' => 'id']);
+    }
+}
diff --git a/tests/specs/issue_fix/88_in_case_of_updating_a_model_generator_creates_redundant_inverse_relations/mysql/models/base/Human.php b/tests/specs/issue_fix/88_in_case_of_updating_a_model_generator_creates_redundant_inverse_relations/mysql/models/base/Human.php
new file mode 100644
index 00000000..dadaa276
--- /dev/null
+++ b/tests/specs/issue_fix/88_in_case_of_updating_a_model_generator_creates_redundant_inverse_relations/mysql/models/base/Human.php
@@ -0,0 +1,39 @@
+<?php
+
+/**
+ * This file is generated by Gii, do not change manually!
+ */
+
+namespace app\models\base;
+
+/**
+ * This is the model class for table "humans".
+ *
+ * @property int $id
+ * @property string $name
+ * @property int $address_id
+ *
+ * @property \app\models\Address $address
+ */
+abstract class Human extends \yii\db\ActiveRecord
+{
+    public static function tableName()
+    {
+        return '{{%humans}}';
+    }
+
+    public function rules()
+    {
+        return [
+            'trim' => [['name'], 'trim'],
+            'name_string' => [['name'], 'string'],
+            'address_id_integer' => [['address_id'], 'integer'],
+            'address_id_exist' => [['address_id'], 'exist', 'targetRelation' => 'address'],
+        ];
+    }
+
+    public function getAddress()
+    {
+        return $this->hasOne(\app\models\Address::class, ['id' => 'address_id']);
+    }
+}
diff --git a/tests/specs/issue_fix/90_implement_belongs_to_relations_in_models/index.php b/tests/specs/issue_fix/90_implement_belongs_to_relations_in_models/index.php
new file mode 100644
index 00000000..2c6dfb9b
--- /dev/null
+++ b/tests/specs/issue_fix/90_implement_belongs_to_relations_in_models/index.php
@@ -0,0 +1,13 @@
+<?php
+
+return [
+    'openApiPath' => '@specs/issue_fix/90_implement_belongs_to_relations_in_models/index.yaml',
+    'generateUrls' => false,
+    'generateModels' => true,
+    'excludeModels' => [
+        'Error',
+    ],
+    'generateControllers' => false,
+    'generateMigrations' => false,
+    'generateModelFaker' => false, // `generateModels` must be `true` in order to use `generateModelFaker` as `true`
+];
diff --git a/tests/specs/issue_fix/90_implement_belongs_to_relations_in_models/index.yaml b/tests/specs/issue_fix/90_implement_belongs_to_relations_in_models/index.yaml
new file mode 100644
index 00000000..b62591f0
--- /dev/null
+++ b/tests/specs/issue_fix/90_implement_belongs_to_relations_in_models/index.yaml
@@ -0,0 +1,26 @@
+openapi: "3.0.0"
+info:
+  version: 1.0.0
+  title: \#90
+paths:
+  /:
+    get:
+      responses:
+        '200':
+          description: The information
+
+components:
+  schemas:
+    User:
+      type: object
+      properties:
+        id:
+          type: integer
+
+    Address:
+      type: object
+      properties:
+        id:
+          type: integer
+        user:
+          $ref: '#/components/schemas/User'
diff --git a/tests/specs/issue_fix/90_implement_belongs_to_relations_in_models/mysql/models/Address.php b/tests/specs/issue_fix/90_implement_belongs_to_relations_in_models/mysql/models/Address.php
new file mode 100644
index 00000000..abfd7d59
--- /dev/null
+++ b/tests/specs/issue_fix/90_implement_belongs_to_relations_in_models/mysql/models/Address.php
@@ -0,0 +1,10 @@
+<?php
+
+namespace app\models;
+
+class Address extends \app\models\base\Address
+{
+
+
+}
+
diff --git a/tests/specs/issue_fix/90_implement_belongs_to_relations_in_models/mysql/models/User.php b/tests/specs/issue_fix/90_implement_belongs_to_relations_in_models/mysql/models/User.php
new file mode 100644
index 00000000..9b837d6e
--- /dev/null
+++ b/tests/specs/issue_fix/90_implement_belongs_to_relations_in_models/mysql/models/User.php
@@ -0,0 +1,10 @@
+<?php
+
+namespace app\models;
+
+class User extends \app\models\base\User
+{
+
+
+}
+
diff --git a/tests/specs/issue_fix/90_implement_belongs_to_relations_in_models/mysql/models/base/Address.php b/tests/specs/issue_fix/90_implement_belongs_to_relations_in_models/mysql/models/base/Address.php
new file mode 100644
index 00000000..a0a09431
--- /dev/null
+++ b/tests/specs/issue_fix/90_implement_belongs_to_relations_in_models/mysql/models/base/Address.php
@@ -0,0 +1,36 @@
+<?php
+
+/**
+ * This file is generated by Gii, do not change manually!
+ */
+
+namespace app\models\base;
+
+/**
+ * This is the model class for table "addresses".
+ *
+ * @property int $id
+ * @property int $user_id
+ *
+ * @property \app\models\User $user
+ */
+abstract class Address extends \yii\db\ActiveRecord
+{
+    public static function tableName()
+    {
+        return '{{%addresses}}';
+    }
+
+    public function rules()
+    {
+        return [
+            'user_id_integer' => [['user_id'], 'integer'],
+            'user_id_exist' => [['user_id'], 'exist', 'targetRelation' => 'user'],
+        ];
+    }
+
+    public function getUser()
+    {
+        return $this->hasOne(\app\models\User::class, ['id' => 'user_id']);
+    }
+}
diff --git a/tests/specs/issue_fix/90_implement_belongs_to_relations_in_models/mysql/models/base/User.php b/tests/specs/issue_fix/90_implement_belongs_to_relations_in_models/mysql/models/base/User.php
new file mode 100644
index 00000000..a6a35b66
--- /dev/null
+++ b/tests/specs/issue_fix/90_implement_belongs_to_relations_in_models/mysql/models/base/User.php
@@ -0,0 +1,32 @@
+<?php
+
+/**
+ * This file is generated by Gii, do not change manually!
+ */
+
+namespace app\models\base;
+
+/**
+ * This is the model class for table "users".
+ *
+ * @property int $id
+ *
+ */
+abstract class User extends \yii\db\ActiveRecord
+{
+    public static function tableName()
+    {
+        return '{{%users}}';
+    }
+
+    public function rules()
+    {
+        return [];
+    }
+
+    # belongs to relation
+    public function getAddress()
+    {
+        return $this->hasOne(\app\models\Address::class, ['user_id' => 'id']);
+    }
+}
diff --git a/tests/specs/issue_fix/96_component_schema_should_be_optional/index.php b/tests/specs/issue_fix/96_component_schema_should_be_optional/index.php
new file mode 100644
index 00000000..34db291a
--- /dev/null
+++ b/tests/specs/issue_fix/96_component_schema_should_be_optional/index.php
@@ -0,0 +1,13 @@
+<?php
+
+return [
+    'openApiPath' => '@specs/issue_fix/96_component_schema_should_be_optional/index.yml',
+    'generateUrls' => false,
+    'generateModels' => true,
+    'excludeModels' => [
+        'Error',
+    ],
+    'generateControllers' => false,
+    'generateMigrations' => false,
+    'generateModelFaker' => true,
+];
diff --git a/tests/specs/issue_fix/96_component_schema_should_be_optional/index.yml b/tests/specs/issue_fix/96_component_schema_should_be_optional/index.yml
new file mode 100644
index 00000000..5dcbc3cb
--- /dev/null
+++ b/tests/specs/issue_fix/96_component_schema_should_be_optional/index.yml
@@ -0,0 +1,13 @@
+openapi: "3.0.0"
+info:
+  version: 1.0.0
+  title: 96_component_schema_should_be_optional
+
+paths:
+  /:
+    get:
+      summary: List
+      operationId: list
+      responses:
+        '200':
+          description: The information
diff --git a/tests/specs/issue_fix/96_component_schema_should_be_optional/mysql/models/BaseModelFaker.php b/tests/specs/issue_fix/96_component_schema_should_be_optional/mysql/models/BaseModelFaker.php
new file mode 100644
index 00000000..c367fbb4
--- /dev/null
+++ b/tests/specs/issue_fix/96_component_schema_should_be_optional/mysql/models/BaseModelFaker.php
@@ -0,0 +1,144 @@
+<?php
+
+namespace app\models;
+
+use Faker\Factory as FakerFactory;
+use Faker\Generator;
+use Faker\UniqueGenerator;
+
+/**
+ * Base fake data generator
+ */
+abstract class BaseModelFaker
+{
+    /**
+     * @var Generator
+    */
+    protected $faker;
+    /**
+     * @var UniqueGenerator
+    */
+    protected $uniqueFaker;
+
+    public function __construct()
+    {
+        $this->faker = FakerFactory::create(str_replace('-', '_', \Yii::$app->language));
+        $this->uniqueFaker = new UniqueGenerator($this->faker);
+    }
+
+    abstract public function generateModel($attributes = []);
+
+    public function getFaker():Generator
+    {
+        return $this->faker;
+    }
+
+    public function getUniqueFaker():UniqueGenerator
+    {
+        return $this->uniqueFaker;
+    }
+
+    public function setFaker(Generator $faker):void
+    {
+        $this->faker = $faker;
+    }
+
+    public function setUniqueFaker(UniqueGenerator $faker):void
+    {
+        $this->uniqueFaker = $faker;
+    }
+
+    /**
+     * Generate and return model
+     * @param array|callable $attributes
+     * @param UniqueGenerator|null $uniqueFaker
+     * @return \yii\db\ActiveRecord
+     * @example MyFaker::makeOne(['user_id' => 1, 'title' => 'foo']);
+     * @example MyFaker::makeOne( function($model, $faker) {
+     *        $model->scenario = 'create';
+     *        $model->setAttributes(['user_id' => 1, 'title' => $faker->sentence]);
+     *        return $model;
+     *  });
+     */
+    public static function makeOne($attributes = [], ?UniqueGenerator $uniqueFaker = null)
+    {
+        $fakeBuilder = new static();
+        if ($uniqueFaker !== null) {
+            $fakeBuilder->setUniqueFaker($uniqueFaker);
+        }
+        $model = $fakeBuilder->generateModel($attributes);
+        return $model;
+    }
+
+    /**
+     * Generate, save and return model
+     * @param array|callable $attributes
+     * @param UniqueGenerator|null $uniqueFaker
+     * @return \yii\db\ActiveRecord
+     * @example MyFaker::saveOne(['user_id' => 1, 'title' => 'foo']);
+     * @example MyFaker::saveOne( function($model, $faker) {
+     *        $model->scenario = 'create';
+     *        $model->setAttributes(['user_id' => 1, 'title' => $faker->sentence]);
+     *        return $model;
+     *  });
+     */
+    public static function saveOne($attributes = [], ?UniqueGenerator $uniqueFaker = null)
+    {
+        $model = static::makeOne($attributes, $uniqueFaker);
+        $model->save();
+        return $model;
+    }
+
+    /**
+     * Generate and return multiple models
+     * @param int $number
+     * @param array|callable $commonAttributes
+     * @return \yii\db\ActiveRecord[]|array
+     * @example TaskFaker::make(5, ['project_id'=>1, 'user_id' => 2]);
+     * @example TaskFaker::make(5, function($model, $faker, $uniqueFaker) {
+     *       $model->setAttributes(['name' => $uniqueFaker->username, 'state'=>$faker->boolean(20)]);
+     *       return $model;
+     * });
+     */
+    public static function make(int $number, $commonAttributes = [], ?UniqueGenerator $uniqueFaker = null):array
+    {
+        if ($number < 1) {
+            return [];
+        }
+        $fakeBuilder = new static();
+        if ($uniqueFaker !== null) {
+            $fakeBuilder->setUniqueFaker($uniqueFaker);
+        }
+        return array_map(function () use ($commonAttributes, $fakeBuilder) {
+            $model = $fakeBuilder->generateModel($commonAttributes);
+            return $model;
+        }, range(0, $number -1));
+    }
+
+    /**
+     * Generate, save and return multiple models
+     * @param int $number
+     * @param array|callable $commonAttributes
+     * @return \yii\db\ActiveRecord[]|array
+     * @example TaskFaker::save(5, ['project_id'=>1, 'user_id' => 2]);
+     * @example TaskFaker::save(5, function($model, $faker, $uniqueFaker) {
+     *       $model->setAttributes(['name' => $uniqueFaker->username, 'state'=>$faker->boolean(20)]);
+     *       return $model;
+     * });
+     */
+    public static function save(int $number, $commonAttributes = [], ?UniqueGenerator $uniqueFaker = null):array
+    {
+        if ($number < 1) {
+            return [];
+        }
+        $fakeBuilder = new static();
+        if ($uniqueFaker !== null) {
+            $fakeBuilder->setUniqueFaker($uniqueFaker);
+        }
+        return array_map(function () use ($commonAttributes, $fakeBuilder) {
+            $model = $fakeBuilder->generateModel($commonAttributes);
+            $model->save();
+            return $model;
+        }, range(0, $number -1));
+    }
+}
diff --git a/tests/specs/issue_fix/model_name_more_than_once_in_faker_148/app/models/base/Account.php b/tests/specs/issue_fix/model_name_more_than_once_in_faker_148/app/models/base/Account.php
index f875eadd..a296c4c0 100644
--- a/tests/specs/issue_fix/model_name_more_than_once_in_faker_148/app/models/base/Account.php
+++ b/tests/specs/issue_fix/model_name_more_than_once_in_faker_148/app/models/base/Account.php
@@ -29,18 +29,21 @@ public function rules()
         ];
     }
 
+    # belongs to relation
     public function getE123()
     {
-        return $this->hasOne(\app\models\E123::class, ['account_id' => 'id'])->inverseOf('account');
+        return $this->hasOne(\app\models\E123::class, ['account_id' => 'id']);
     }
 
+    # belongs to relation
     public function getE1232()
     {
-        return $this->hasOne(\app\models\E123::class, ['account_2_id' => 'id'])->inverseOf('account_2');
+        return $this->hasOne(\app\models\E123::class, ['account_2_id' => 'id']);
     }
 
+    # belongs to relation
     public function getE1233()
     {
-        return $this->hasOne(\app\models\E123::class, ['account_3_id' => 'id'])->inverseOf('account_3');
+        return $this->hasOne(\app\models\E123::class, ['account_3_id' => 'id']);
     }
 }
diff --git a/tests/specs/petstore/models/base/Store.php b/tests/specs/petstore/models/base/Store.php
index 9589d1b8..d9eafaca 100644
--- a/tests/specs/petstore/models/base/Store.php
+++ b/tests/specs/petstore/models/base/Store.php
@@ -29,8 +29,9 @@ public function rules()
         ];
     }
 
+    # belongs to relation
     public function getPet()
     {
-        return $this->hasOne(\app\models\Pet::class, ['store_id' => 'id'])->inverseOf('store');
+        return $this->hasOne(\app\models\Pet::class, ['store_id' => 'id']);
     }
 }
diff --git a/tests/specs/petstore_jsonapi/models/base/Pet.php b/tests/specs/petstore_jsonapi/models/base/Pet.php
index 6444cf28..0f057dc1 100644
--- a/tests/specs/petstore_jsonapi/models/base/Pet.php
+++ b/tests/specs/petstore_jsonapi/models/base/Pet.php
@@ -64,8 +64,9 @@ public function getDuplicates()
         return $this->hasMany(\app\models\Pet::class, ['tag' => 'tag']);
     }
 
+    # belongs to relation
     public function getPetStatistic()
     {
-        return $this->hasOne(\app\models\PetStatistic::class, ['parentPet_id' => 'id'])->inverseOf('parentPet');
+        return $this->hasOne(\app\models\PetStatistic::class, ['parentPet_id' => 'id']);
     }
 }
diff --git a/tests/specs/petstore_namespace/mymodels/base/Store.php b/tests/specs/petstore_namespace/mymodels/base/Store.php
index 24d0f4e4..35aa907f 100644
--- a/tests/specs/petstore_namespace/mymodels/base/Store.php
+++ b/tests/specs/petstore_namespace/mymodels/base/Store.php
@@ -29,8 +29,9 @@ public function rules()
         ];
     }
 
+    # belongs to relation
     public function getPet()
     {
-        return $this->hasOne(\app\mymodels\Pet::class, ['store_id' => 'id'])->inverseOf('store');
+        return $this->hasOne(\app\mymodels\Pet::class, ['store_id' => 'id']);
     }
 }
diff --git a/tests/specs/relations_in_faker/app/models/base/A123.php b/tests/specs/relations_in_faker/app/models/base/A123.php
index 0c733222..74d782f2 100644
--- a/tests/specs/relations_in_faker/app/models/base/A123.php
+++ b/tests/specs/relations_in_faker/app/models/base/A123.php
@@ -37,8 +37,9 @@ public function getB123()
         return $this->hasOne(\app\models\B123::class, ['id' => 'b123_id']);
     }
 
+    # belongs to relation
     public function getRouting()
     {
-        return $this->hasOne(\app\models\Routing::class, ['a123_id' => 'id'])->inverseOf('a123');
+        return $this->hasOne(\app\models\Routing::class, ['a123_id' => 'id']);
     }
 }
diff --git a/tests/specs/relations_in_faker/app/models/base/Account.php b/tests/specs/relations_in_faker/app/models/base/Account.php
index e1198a95..c5bfedb1 100644
--- a/tests/specs/relations_in_faker/app/models/base/Account.php
+++ b/tests/specs/relations_in_faker/app/models/base/Account.php
@@ -29,8 +29,9 @@ public function rules()
         ];
     }
 
+    # belongs to relation
     public function getDomain()
     {
-        return $this->hasOne(\app\models\Domain::class, ['account_id' => 'id'])->inverseOf('account');
+        return $this->hasOne(\app\models\Domain::class, ['account_id' => 'id']);
     }
 }
diff --git a/tests/specs/relations_in_faker/app/models/base/B123.php b/tests/specs/relations_in_faker/app/models/base/B123.php
index 7ad4eb77..63727b75 100644
--- a/tests/specs/relations_in_faker/app/models/base/B123.php
+++ b/tests/specs/relations_in_faker/app/models/base/B123.php
@@ -37,13 +37,15 @@ public function getC123()
         return $this->hasOne(\app\models\C123::class, ['id' => 'c123_id']);
     }
 
+    # belongs to relation
     public function getA123()
     {
-        return $this->hasOne(\app\models\A123::class, ['b123_id' => 'id'])->inverseOf('b123');
+        return $this->hasOne(\app\models\A123::class, ['b123_id' => 'id']);
     }
 
-    public function getE1232()
+    # belongs to relation
+    public function getE123()
     {
-        return $this->hasOne(\app\models\E123::class, ['b123_id' => 'id'])->inverseOf('b123');
+        return $this->hasOne(\app\models\E123::class, ['b123_id' => 'id']);
     }
 }
diff --git a/tests/specs/relations_in_faker/app/models/base/C123.php b/tests/specs/relations_in_faker/app/models/base/C123.php
index 6c5677dd..7f516f78 100644
--- a/tests/specs/relations_in_faker/app/models/base/C123.php
+++ b/tests/specs/relations_in_faker/app/models/base/C123.php
@@ -28,8 +28,9 @@ public function rules()
         ];
     }
 
+    # belongs to relation
     public function getB123()
     {
-        return $this->hasOne(\app\models\B123::class, ['c123_id' => 'id'])->inverseOf('c123');
+        return $this->hasOne(\app\models\B123::class, ['c123_id' => 'id']);
     }
 }
diff --git a/tests/specs/relations_in_faker/app/models/base/D123.php b/tests/specs/relations_in_faker/app/models/base/D123.php
index 80a5017d..71555b18 100644
--- a/tests/specs/relations_in_faker/app/models/base/D123.php
+++ b/tests/specs/relations_in_faker/app/models/base/D123.php
@@ -28,8 +28,9 @@ public function rules()
         ];
     }
 
+    # belongs to relation
     public function getRouting()
     {
-        return $this->hasOne(\app\models\Routing::class, ['d123_id' => 'id'])->inverseOf('d123');
+        return $this->hasOne(\app\models\Routing::class, ['d123_id' => 'id']);
     }
 }
diff --git a/tests/specs/relations_in_faker/app/models/base/Domain.php b/tests/specs/relations_in_faker/app/models/base/Domain.php
index df6e0822..fa563120 100644
--- a/tests/specs/relations_in_faker/app/models/base/Domain.php
+++ b/tests/specs/relations_in_faker/app/models/base/Domain.php
@@ -45,8 +45,9 @@ public function getRoutings()
         return $this->hasMany(\app\models\Routing::class, ['domain_id' => 'id'])->inverseOf('domain');
     }
 
+    # belongs to relation
     public function getRouting()
     {
-        return $this->hasOne(\app\models\Routing::class, ['domain_id' => 'id'])->inverseOf('domain');
+        return $this->hasOne(\app\models\Routing::class, ['domain_id' => 'id']);
     }
 }
diff --git a/tests/unit/IssueFixTest.php b/tests/unit/IssueFixTest.php
index 08d1a00c..8d57cd1b 100644
--- a/tests/unit/IssueFixTest.php
+++ b/tests/unit/IssueFixTest.php
@@ -1030,6 +1030,20 @@ public function test23ConsiderOpenapiExtensionXNoRelationAlsoInOtherPertinentPla
         $this->runActualMigrations();
     }
 
+    // https://github.com/php-openapi/yii2-openapi/issues/79
+    public function test79ResponseStatusCodesAreNotTheCodesDefinedInSpec()
+    {
+        $testFile = Yii::getAlias("@specs/issue_fix/79_response_status_codes_are_not_the_codes_defined_in_spec/index.php");
+        $this->runGenerator($testFile);
+        $actualFiles = FileHelper::findFiles(Yii::getAlias('@app'), [
+            'recursive' => true,
+        ]);
+        $expectedFiles = FileHelper::findFiles(Yii::getAlias("@specs/issue_fix/79_response_status_codes_are_not_the_codes_defined_in_spec/mysql"), [
+            'recursive' => true,
+        ]);
+        $this->checkFiles($actualFiles, $expectedFiles);
+    }
+
     // https://github.com/php-openapi/yii2-openapi/issues/87
     public function test87ImplementForJsonInIsrefpointertoschema()
     {
@@ -1044,4 +1058,60 @@ public function test87ImplementForJsonInIsrefpointertoschema()
         $this->checkFiles($actualFiles, $expectedFiles);
         $this->runActualMigrations();
     }
+
+    // https://github.com/php-openapi/yii2-openapi/issues/96
+    public function test96ComponentSchemaShouldBeOptional()
+    {
+        $testFile = Yii::getAlias("@specs/issue_fix/96_component_schema_should_be_optional/index.php");
+        $this->runGenerator($testFile);
+        $actualFiles = FileHelper::findFiles(Yii::getAlias('@app'), [
+            'recursive' => true,
+        ]);
+        $expectedFiles = FileHelper::findFiles(Yii::getAlias("@specs/issue_fix/96_component_schema_should_be_optional/mysql"), [
+            'recursive' => true,
+        ]);
+        $this->checkFiles($actualFiles, $expectedFiles);
+    }
+
+    // https://github.com/php-openapi/yii2-openapi/issues/88
+    public function test88InCaseOfUpdatingAModelGeneratorCreatesRedundantInverseRelations()
+    {
+        $testFile = Yii::getAlias("@specs/issue_fix/88_in_case_of_updating_a_model_generator_creates_redundant_inverse_relations/index.php");
+        $this->runGenerator($testFile);
+        $actualFiles = FileHelper::findFiles(Yii::getAlias('@app'), [
+            'recursive' => true,
+        ]);
+        $expectedFiles = FileHelper::findFiles(Yii::getAlias("@specs/issue_fix/88_in_case_of_updating_a_model_generator_creates_redundant_inverse_relations/mysql"), [
+            'recursive' => true,
+        ]);
+        $this->checkFiles($actualFiles, $expectedFiles);
+    }
+
+    // https://github.com/php-openapi/yii2-openapi/issues/78
+    public function test78PropertiesThatAreMarkedAsReadonlyAreNotReadOnly()
+    {
+        $testFile = Yii::getAlias("@specs/issue_fix/78_properties_that_are_marked_as_readonly_are_not_read_only/index.php");
+        $this->runGenerator($testFile);
+        $actualFiles = FileHelper::findFiles(Yii::getAlias('@app'), [
+            'recursive' => true,
+        ]);
+        $expectedFiles = FileHelper::findFiles(Yii::getAlias("@specs/issue_fix/78_properties_that_are_marked_as_readonly_are_not_read_only/mysql"), [
+            'recursive' => true,
+        ]);
+        $this->checkFiles($actualFiles, $expectedFiles);
+    }
+
+    // https://github.com/php-openapi/yii2-openapi/issues/90
+    public function test90ImplementBelongsToRelationsInModels()
+    {
+        $testFile = Yii::getAlias("@specs/issue_fix/90_implement_belongs_to_relations_in_models/index.php");
+        $this->runGenerator($testFile);
+        $actualFiles = FileHelper::findFiles(Yii::getAlias('@app'), [
+            'recursive' => true,
+        ]);
+        $expectedFiles = FileHelper::findFiles(Yii::getAlias("@specs/issue_fix/90_implement_belongs_to_relations_in_models/mysql"), [
+            'recursive' => true,
+        ]);
+        $this->checkFiles($actualFiles, $expectedFiles);
+    }
 }