fix: including nested relations

Author: alexzarbn

src/Drivers/Standard/QueryBuilder.php

@@ -340,7 +340,16 @@ public function getQualifiedFieldName(string $field): string
      */
     public function getRelationModelClass(string $relation): string
     {
-        return get_class((new $this->resourceModelClass)->$relation()->getModel());
+        $relations = collect(explode('.', $relation));
+        $relation = $relations[0];
+
+        $resourceModel = (new $this->resourceModelClass)->$relation()->getModel();
+
+        foreach ($relations->skip(1) as $nestedRelation) {
+            $resourceModel = $resourceModel->$nestedRelation()->getModel();
+        }
+
+        return get_class($resourceModel);
     }
 
     /**

tests/Feature/StandardShowOperationsTest.php

@@ -108,4 +108,16 @@ public function getting_a_single_resource_with_included_relation(): void
 
         $this->assertResourceShown($response, $post->fresh('user')->toArray());
     }
+
+    /** @test */
+    public function getting_a_single_resource_with_nested_included_relation(): void
+    {
+        $post = factory(Post::class)->create(['user_id' => factory(User::class)->create()->id]);
+
+        Gate::policy(Post::class, GreenPolicy::class);
+
+        $response = $this->get("/api/posts/{$post->id}?include=user.roles");
+
+        $this->assertResourceShown($response, $post->fresh('user.roles')->toArray());
+    }
 }

tests/Fixtures/app/Http/Controllers/PostsController.php

@@ -58,6 +58,6 @@ public function exposedScopes(): array
      */
     public function includes(): array
     {
-        return ['user'];
+        return ['user', 'user.roles'];
     }
 }

tests/Fixtures/app/Models/User.php

@@ -42,7 +42,6 @@ public function roles()
 
     public function notifications()
     {
-//        $this->roles()->whereDate()
         return $this->belongsToMany(Notification::class)->withPivot('meta');
     }
 }