community-manage/app/Transformers/TopicTransformer.php

<?php
/**
 * Created by PhpStorm.
 * User: Administrator
 * Date: 2019-06-10
 * Time: 18:47
 */
namespace App\Transformers;
use App\Models\Topic;
use League\Fractal\TransformerAbstract;
use Illuminate\Support\Carbon;

class TopicTransformer extends TransformerAbstract{

    public function transform(Topic $topic)
    {
        $category = [];
        foreach ($topic->ct as $key=>$value){
            if($key < 3){
                $category[] = $value->category->name;
            }
        }
        return [
            'id' => $topic['id'],
            'name' => $topic['name'],
            'img' => $topic['img'],
            'is_suggest' => $topic['is_suggest'],
            'is_hot' => $topic['is_hot'],
            'is_open' => $topic['is_open'],
            'desc' => $topic['desc'],
            'post_count' => $topic['use_count'],
            'follow_count' => $topic['follow_count'],
            'page_count' => $topic['pv'],
            'created_at' => Carbon::parse($topic['created_at'])->toDateTimeString(),
            'category_list'=>$category,
        ];
    }
}