[10.x] Allow utilising withTrashed(), withoutTrashed() and onlyTrashed() on MorphTo relationship even without SoftDeletes Model

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

@@ -350,6 +350,57 @@ public function constrain(array $callbacks)
         return $this;
     }
 
+    /**
+     * Indicate that soft deleted models should be included in the results.
+     *
+     * @return $this
+     */
+    public function withTrashed()
+    {
+        $callback = fn ($query) => $query->hasMacro('withTrashed') ? $query->withTrashed() : $query;
+
+        $this->macroBuffer[] = [
+            'method' => 'when',
+            'parameters' => [true, $callback],
+        ];
+
+        return $this->when(true, $callback);
+    }
+
+    /**
+     * Indicate that soft deleted models should not be included in the results.
+     *
+     * @return $this
+     */
+    public function withoutTrashed()
+    {
+        $callback = fn ($query) => $query->hasMacro('withoutTrashed') ? $query->withoutTrashed() : $query;
+
+        $this->macroBuffer[] = [
+            'method' => 'when',
+            'parameters' => [true, $callback],
+        ];
+
+        return $this->when(true, $callback);
+    }
+
+    /**
+     * Indicate that only soft deleted models should be included in the results.
+     *
+     * @return $this
+     */
+    public function onlyTrashed()
+    {
+        $callback = fn ($query) => $query->hasMacro('onlyTrashed') ? $query->onlyTrashed() : $query;
+
+        $this->macroBuffer[] = [
+            'method' => 'when',
+            'parameters' => [true, $callback],
+        ];
+
+        return $this->when(true, $callback);
+    }
+
     /**
      * Replay stored macro calls on the actual related instance.
      *

tests/Integration/Database/EloquentMorphEagerLoadingTest.php

@@ -4,6 +4,7 @@
 
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\MorphTo;
+use Illuminate\Database\Eloquent\SoftDeletes;
 use Illuminate\Database\Schema\Blueprint;
 use Illuminate\Support\Facades\Schema;
 use Illuminate\Tests\Integration\Database\DatabaseTestCase;
@@ -14,6 +15,7 @@ protected function defineDatabaseMigrationsAfterDatabaseRefreshed()
     {
         Schema::create('users', function (Blueprint $table) {
             $table->increments('id');
+            $table->softDeletes();
         });
 
         Schema::create('posts', function (Blueprint $table) {
@@ -25,20 +27,30 @@ protected function defineDatabaseMigrationsAfterDatabaseRefreshed()
             $table->increments('video_id');
         });
 
+        Schema::create('actions', function (Blueprint $table) {
+            $table->increments('id');
+            $table->string('target_type');
+            $table->integer('target_id');
+        });
+
         Schema::create('comments', function (Blueprint $table) {
             $table->increments('id');
             $table->string('commentable_type');
             $table->integer('commentable_id');
         });
 
         $user = User::create();
+        $user2 = User::forceCreate(['deleted_at' => now()]);
 
         $post = tap((new Post)->user()->associate($user))->save();
 
         $video = Video::create();
 
         (new Comment)->commentable()->associate($post)->save();
         (new Comment)->commentable()->associate($video)->save();
+
+        (new Action)->target()->associate($video)->save();
+        (new Action)->target()->associate($user2)->save();
     }
 
     public function testWithMorphLoading()
@@ -49,9 +61,13 @@ public function testWithMorphLoading()
             }])
             ->get();
 
+        $this->assertCount(2, $comments);
+
         $this->assertTrue($comments[0]->relationLoaded('commentable'));
+        $this->assertInstanceOf(Post::class, $comments[0]->getRelation('commentable'));
         $this->assertTrue($comments[0]->commentable->relationLoaded('user'));
         $this->assertTrue($comments[1]->relationLoaded('commentable'));
+        $this->assertInstanceOf(Video::class, $comments[1]->getRelation('commentable'));
     }
 
     public function testWithMorphLoadingWithSingleRelation()
@@ -65,6 +81,30 @@ public function testWithMorphLoadingWithSingleRelation()
         $this->assertTrue($comments[0]->relationLoaded('commentable'));
         $this->assertTrue($comments[0]->commentable->relationLoaded('user'));
     }
+
+    public function testMorphLoadingMixedWithTrashedRelations()
+    {
+        $action = Action::query()
+            ->with('target')
+            ->get();
+
+        $this->assertCount(2, $action);
+
+        $this->assertTrue($action[0]->relationLoaded('target'));
+        $this->assertInstanceOf(Video::class, $action[0]->getRelation('target'));
+        $this->assertTrue($action[1]->relationLoaded('target'));
+        $this->assertInstanceOf(User::class, $action[1]->getRelation('target'));
+    }
+}
+
+class Action extends Model
+{
+    public $timestamps = false;
+
+    public function target()
+    {
+        return $this->morphTo()->withTrashed();
+    }
 }
 
 class Comment extends Model
@@ -90,6 +130,8 @@ public function user()
 
 class User extends Model
 {
+    use SoftDeletes;
+
     public $timestamps = false;
 }