macmotp's avatar

L5 creating API with pagination - Issue

I am trying to create an API with Laravel 5 and in order to refresh my memory for a good architecture I followed again the "Incremental APIs" series. Everything worked perfectly until I tried to paginate my results, this is the error I have (I duplicate my code for help using the same situation as Jeffrey did so you will find 'Lessons' and 'title'):


ErrorException in LessonTransformer.php line 12:
Illegal string offset 'title'

at HandleExceptions->handleError('2', 'Illegal string offset 'title'', '/.../app/Transformers/LessonTransformer.php', '12', array('lessons' => 'http://.../api/v1/lessons/?page=2')) in LessonTransformer.php line 12

In my controller:


public function index(LessonTransformer $lessonTransformer)
 {
    $limit = Input::get('limit', 10);

    $lessons = Lesson::paginate($limit);

    return $this->respond([
   'lessons' => $lessonTransformer->transformCollection($lessons)
    ]);
 }

Only difference you can find is that I index the array with 'lessons' and not with 'data'. Also, I repeat, if in my controller I use Lesson::all() it works. it doesn't work the ->all() method though so I simply used ->toArray().

Hope someone can help, I don't know if it is my mistake or not, or if the issue is in L5

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4 replies
macmotp's avatar

abstract class Transformer {

 /**
  * Transform a collection of items
  *
  * @param array $items
  * @return array
  */
 public function transformCollection(array $items)
 {
  return array_map([$this, 'transform'], $items);
 }

 public abstract function transform($item);

}

class LessonTransformer extends Transformer {

 /**
  * @param $lesson
  * @return array
  */
 public function transform($lesson)
 {
    return [
      'title' => $lesson['title'],
      'description' => $lesson['description']
    ];
 }


}
macmotp's avatar

@thawheinthit I had this issue while L5 was still in beta. Anyway it totally works now: in your controller just add ->all() method after your collection when passing to the transformCollection function:


public function index(LessonTransformer $lessonTransformer)
 {
    $limit = Input::get('limit', 10);

    $lessons = Lesson::paginate($limit);

    return $this->respond([
   'lessons' => $lessonTransformer->transformCollection($lessons->all())
    ]);
 }
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