community-service/app/Transformers/Topic/TopicDetailTransformer.php

<?php
/**
 * Created by PhpStorm.
 * User: Administrator
 * Date: 2019/6/17
 * Time: 18:10
 */
namespace  App\Transformers\Topic;

use App\Models\Topic;
use Carbon\Carbon;
use League\Fractal\TransformerAbstract;

class TopicDetailTransformer extends TransformerAbstract
{
    public function __construct($uid)
    {
        $this->uid = $uid;
    }
    public function transform(Topic $topic)
    {
        return [
            'id' => $topic['id'],
            'name' => $topic['name'],
            'img' => $topic['img'],
            'follow_count' => $topic->follow->count() + (int) config('customer.add_topic_follow_count'),
            'is_follow' => $topic->follow->where('uid', $this->uid)->count()?1:0,
        ];
    }
}