[JSON:API] Allows JsonApiResource::$attributes (#57638)

* [JSON:API] Allows `JsonApiResource::$attributes`

Signed-off-by: Mior Muhammad Zaki <crynobone@gmail.com>

* Apply fixes from StyleCI

* Update tests

Signed-off-by: Mior Muhammad Zaki <crynobone@gmail.com>

* formatting

---------

Signed-off-by: Mior Muhammad Zaki <crynobone@gmail.com>
Co-authored-by: StyleCI Bot <bot@styleci.io>
Co-authored-by: Taylor Otwell <taylor@laravel.com>

Author: 3 people

src/Illuminate/Http/Resources/JsonApi/JsonApiResource.php

@@ -71,6 +71,22 @@ public function toType(Request $request)
         return null;
     }
 
+    /**
+     * Transform the resource into an array.
+     *
+     * @param  \Illuminate\Http\Request  $request
+     * @return \Illuminate\Contracts\Support\Arrayable|\JsonSerializable|array
+     */
+    #[\Override]
+    public function toAttributes(Request $request)
+    {
+        if (property_exists($this, 'attributes')) {
+            return $this->attributes;
+        }
+
+        return $this->toArray($request);
+    }
+
     /**
      * Get the resource's links.
      *

tests/Integration/Http/Resources/JsonApi/JsonApiResourceTest.php

@@ -186,13 +186,10 @@ public function user()
 
 class PostApiResource extends JsonApiResource
 {
-    public function toAttributes(Request $request)
-    {
-        return [
-            'title',
-            'content',
-        ];
-    }
+    protected array $attributes = [
+        'title',
+        'content',
+    ];
 }
 
 class PostFactory extends Factory