[5.2] Fix morphTo without SoftDeletes

src/Illuminate/Database/Eloquent/Relations/MorphTo.php

@@ -177,13 +177,11 @@ protected function getResultsByType($type)
 
         $key = $instance->getTable().'.'.$instance->getKeyName();
 
-        $query = clone $this->query;
+        $query = $instance->newQuery();
 
         $query->setEagerLoads($this->getEagerLoadsForInstance($instance));
 
-        $query->setModel($instance);
-
-        $query->useConnection($instance->getConnection());
+        $this->mergeRelationWheresToMorphQuery($this->query, $query);
 
         return $query->whereIn($key, $this->gatherKeysByType($type)->all())->get();
     }
@@ -205,6 +203,22 @@ protected function getEagerLoadsForInstance(Model $instance)
         })->merge($instance->getEagerLoads())->all();
     }
 
+    /**
+     * Merge the "wheres" from a relation query to a morph query.
+     *
+     * @param  \Illuminate\Database\Eloquent\Builder  $relationQuery
+     * @param  \Illuminate\Database\Eloquent\Builder  $morphQuery
+     * @return void
+     */
+    protected function mergeRelationWheresToMorphQuery(Builder $relationQuery, Builder $morphQuery)
+    {
+        $removedScopes = $relationQuery->removedScopes();
+
+        $morphQuery->withoutGlobalScopes($removedScopes)->mergeWheres(
+            $relationQuery->getQuery()->wheres, $relationQuery->getBindings()
+        );
+    }
+
     /**
      * Gather all of the foreign keys for a given type.
      *

src/Illuminate/Database/Query/Builder.php

@@ -2321,23 +2321,6 @@ public function useWritePdo()
         return $this;
     }
 
-    /**
-     * Use a different connection for the query.
-     *
-     * @param  \Illuminate\Database\ConnectionInterface  $connection
-     * @param  \Illuminate\Database\Query\Grammars\Grammar  $grammar
-     * @param  \Illuminate\Database\Query\Processors\Processor  $processor
-     * @return void
-     */
-    public function useConnection(ConnectionInterface $connection,
-                                  Grammar $grammar = null,
-                                  Processor $processor = null)
-    {
-        $this->connection = $connection;
-        $this->grammar = $grammar ?: $connection->getQueryGrammar();
-        $this->processor = $processor ?: $connection->getPostProcessor();
-    }
-
     /**
      * Handle dynamic method calls into the method.
      *

tests/Database/DatabaseEloquentSoftDeletesIntegrationTest.php

@@ -579,6 +579,26 @@ public function testMorphToWithoutConstraints()
         $this->assertEquals(null, $comment->owner);
     }
 
+    public function testMorphToNonSoftDeletingModel()
+    {
+        $taylor = TestUserWithoutSoftDelete::create(['id' => 1, 'email' => 'taylorotwell@gmail.com']);
+        $post1 = $taylor->posts()->create(['title' => 'First Title']);
+        $post1->comments()->create([
+            'body' => 'Comment Body',
+            'owner_type' => TestUserWithoutSoftDelete::class,
+            'owner_id' => $taylor->id,
+        ]);
+
+        $comment = SoftDeletesTestCommentWithTrashed::with('owner')->first();
+
+        $this->assertEquals($taylor->email, $comment->owner->email);
+
+        $taylor->delete();
+        $comment = SoftDeletesTestCommentWithTrashed::with('owner')->first();
+
+        $this->assertEquals(null, $comment->owner);
+    }
+
     /**
      * Helpers...
      */
@@ -611,6 +631,20 @@ protected function schema()
     }
 }
 
+/**
+ * Eloquent Models...
+ */
+class TestUserWithoutSoftDelete extends Eloquent
+{
+    protected $table = 'users';
+    protected $guarded = [];
+
+    public function posts()
+    {
+        return $this->hasMany(SoftDeletesTestPost::class, 'user_id');
+    }
+}
+
 /**
  * Eloquent Models...
  */