Pony.fm/app/Http/Controllers/Api/Web/CommentsController.php

<?php

namespace Api\Web;

use App;
use App\Commands\CreateCommentCommand;
use App\Comment;
use Illuminate\Support\Facades\Input;
use Illuminate\Support\Facades\Response;

class CommentsController extends \ApiControllerBase
{
    public function postCreate($type, $id)
    {
        return $this->execute(new CreateCommentCommand($type, $id, Input::all()));
    }

    public function getIndex($type, $id)
    {
        $column = '';

        if ($type == 'track') {
            $column = 'track_id';
        } else {
            if ($type == 'user') {
                $column = 'profile_id';
            } else {
                if ($type == 'album') {
                    $column = 'album_id';
                } else {
                    if ($type == 'playlist') {
                        $column = 'playlist_id';
                    } else {
                        App::abort(500);
                    }
                }
            }
        }

        $query = Comment::where($column, '=', $id)->orderBy('created_at', 'desc')->with('user');
        $comments = [];

        foreach ($query->get() as $comment) {
            $comments[] = Comment::mapPublic($comment);
        }

        return Response::json(['list' => $comments, 'count' => count($comments)]);
    }
}