[10.x] expressions in migration computations fail

src/Illuminate/Database/Schema/Grammars/MySqlGrammar.php

@@ -1071,7 +1071,7 @@ protected function modifyVirtualAs(Blueprint $blueprint, Fluent $column)
         }
 
         if (! is_null($virtualAs = $column->virtualAs)) {
-            return " as ({$virtualAs})";
+            return " as ({$this->getValue($virtualAs)})";
         }
     }
 
@@ -1093,7 +1093,7 @@ protected function modifyStoredAs(Blueprint $blueprint, Fluent $column)
         }
 
         if (! is_null($storedAs = $column->storedAs)) {
-            return " as ({$storedAs}) stored";
+            return " as ({$this->getValue($storedAs)}) stored";
         }
     }
 

src/Illuminate/Database/Schema/Grammars/PostgresGrammar.php

@@ -1183,7 +1183,7 @@ protected function modifyVirtualAs(Blueprint $blueprint, Fluent $column)
         }
 
         if (! is_null($column->virtualAs)) {
-            return " generated always as ({$column->virtualAs})";
+            return " generated always as ({$this->getValue($column->virtualAs)})";
         }
     }
 
@@ -1207,7 +1207,7 @@ protected function modifyStoredAs(Blueprint $blueprint, Fluent $column)
         }
 
         if (! is_null($column->storedAs)) {
-            return " generated always as ({$column->storedAs}) stored";
+            return " generated always as ({$this->getValue($column->storedAs)}) stored";
         }
     }
 

src/Illuminate/Database/Schema/Grammars/SQLiteGrammar.php

@@ -937,7 +937,7 @@ protected function modifyVirtualAs(Blueprint $blueprint, Fluent $column)
         }
 
         if (! is_null($virtualAs = $column->virtualAs)) {
-            return " as ({$virtualAs})";
+            return " as ({$this->getValue($virtualAs)})";
         }
     }
 
@@ -959,7 +959,7 @@ protected function modifyStoredAs(Blueprint $blueprint, Fluent $column)
         }
 
         if (! is_null($storedAs = $column->storedAs)) {
-            return " as ({$column->storedAs}) stored";
+            return " as ({$this->getValue($column->storedAs)}) stored";
         }
     }
 

src/Illuminate/Database/Schema/Grammars/SqlServerGrammar.php

@@ -964,7 +964,7 @@ public function typeMultiPolygon(Fluent $column)
      */
     protected function typeComputed(Fluent $column)
     {
-        return "as ({$column->expression})";
+        return "as ({$this->getValue($column->expression)})";
     }
 
     /**

tests/Database/DatabaseMySqlSchemaGrammarTest.php

@@ -585,6 +585,18 @@ public function testAddingGeneratedColumnWithCharset()
         $this->assertSame('alter table `links` add `url` varchar(2083) character set ascii not null, add `url_hash_virtual` varchar(64) character set ascii as (sha2(url, 256)), add `url_hash_stored` varchar(64) character set ascii as (sha2(url, 256)) stored', $statements[0]);
     }
 
+    public function testAddingGeneratedColumnByExpression()
+    {
+        $blueprint = new Blueprint('products');
+        $blueprint->integer('price');
+        $blueprint->integer('discounted_virtual')->virtualAs(new Expression('price - 5'));
+        $blueprint->integer('discounted_stored')->storedAs(new Expression('price - 5'));
+        $statements = $blueprint->toSql($this->getConnection(), $this->getGrammar());
+
+        $this->assertCount(1, $statements);
+        $this->assertSame('alter table `products` add `price` int not null, add `discounted_virtual` int as (price - 5), add `discounted_stored` int as (price - 5) stored', $statements[0]);
+    }
+
     public function testAddingInvisibleColumn()
     {
         $blueprint = new Blueprint('users');

tests/Database/DatabasePostgresSchemaGrammarTest.php

@@ -3,6 +3,7 @@
 namespace Illuminate\Tests\Database;
 
 use Illuminate\Database\Connection;
+use Illuminate\Database\Query\Expression;
 use Illuminate\Database\Schema\Blueprint;
 use Illuminate\Database\Schema\Builder;
 use Illuminate\Database\Schema\ForeignIdColumnDefinition;
@@ -957,6 +958,13 @@ public function testAddingVirtualAs()
         $statements = $blueprint->toSql($this->getConnection(), $this->getGrammar());
         $this->assertCount(1, $statements);
         $this->assertSame('alter table "users" add column "foo" integer null, add column "bar" boolean not null generated always as (foo is not null)', $statements[0]);
+
+        $blueprint = new Blueprint('users');
+        $blueprint->integer('foo')->nullable();
+        $blueprint->boolean('bar')->virtualAs(new Expression('foo is not null'));
+        $statements = $blueprint->toSql($this->getConnection(), $this->getGrammar());
+        $this->assertCount(1, $statements);
+        $this->assertSame('alter table "users" add column "foo" integer null, add column "bar" boolean not null generated always as (foo is not null)', $statements[0]);
     }
 
     public function testAddingStoredAs()
@@ -967,6 +975,13 @@ public function testAddingStoredAs()
         $statements = $blueprint->toSql($this->getConnection(), $this->getGrammar());
         $this->assertCount(1, $statements);
         $this->assertSame('alter table "users" add column "foo" integer null, add column "bar" boolean not null generated always as (foo is not null) stored', $statements[0]);
+
+        $blueprint = new Blueprint('users');
+        $blueprint->integer('foo')->nullable();
+        $blueprint->boolean('bar')->storedAs(new Expression('foo is not null'));
+        $statements = $blueprint->toSql($this->getConnection(), $this->getGrammar());
+        $this->assertCount(1, $statements);
+        $this->assertSame('alter table "users" add column "foo" integer null, add column "bar" boolean not null generated always as (foo is not null) stored', $statements[0]);
     }
 
     public function testAddingIpAddress()

tests/Database/DatabaseSQLiteSchemaGrammarTest.php

@@ -4,6 +4,7 @@
 
 use Illuminate\Database\Capsule\Manager;
 use Illuminate\Database\Connection;
+use Illuminate\Database\Query\Expression;
 use Illuminate\Database\Schema\Blueprint;
 use Illuminate\Database\Schema\ForeignIdColumnDefinition;
 use Illuminate\Database\Schema\Grammars\SQLiteGrammar;
@@ -888,6 +889,19 @@ public function testAddingGeneratedColumn()
         $this->assertSame($expected, $statements);
     }
 
+    public function testAddingGeneratedColumnByExpression()
+    {
+        $blueprint = new Blueprint('products');
+        $blueprint->create();
+        $blueprint->integer('price');
+        $blueprint->integer('discounted_virtual')->virtualAs(new Expression('"price" - 5'));
+        $blueprint->integer('discounted_stored')->storedAs(new Expression('"price" - 5'));
+        $statements = $blueprint->toSql($this->getConnection(), $this->getGrammar());
+
+        $this->assertCount(1, $statements);
+        $this->assertSame('create table "products" ("price" integer not null, "discounted_virtual" integer as ("price" - 5), "discounted_stored" integer as ("price" - 5) stored)', $statements[0]);
+    }
+
     public function testGrammarsAreMacroable()
     {
         // compileReplace macro.

tests/Database/DatabaseSqlServerSchemaGrammarTest.php

@@ -3,6 +3,7 @@
 namespace Illuminate\Tests\Database;
 
 use Illuminate\Database\Connection;
+use Illuminate\Database\Query\Expression;
 use Illuminate\Database\Schema\Blueprint;
 use Illuminate\Database\Schema\ForeignIdColumnDefinition;
 use Illuminate\Database\Schema\Grammars\SqlServerGrammar;
@@ -911,6 +912,14 @@ public function testAddingGeneratedColumn()
         $statements = $blueprint->toSql($this->getConnection(), $this->getGrammar());
         $this->assertCount(1, $statements);
         $this->assertSame('alter table "products" add "price" int not null, "discounted_virtual" as (price - 5), "discounted_stored" as (price - 5) persisted', $statements[0]);
+
+        $blueprint = new Blueprint('products');
+        $blueprint->integer('price');
+        $blueprint->computed('discounted_virtual', new Expression('price - 5'));
+        $blueprint->computed('discounted_stored', new Expression('price - 5'))->persisted();
+        $statements = $blueprint->toSql($this->getConnection(), $this->getGrammar());
+        $this->assertCount(1, $statements);
+        $this->assertSame('alter table "products" add "price" int not null, "discounted_virtual" as (price - 5), "discounted_stored" as (price - 5) persisted', $statements[0]);
     }
 
     public function testGrammarsAreMacroable()