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\InterestCircle;
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)
    {
        $isFollow = 0;
        if ($this->uid) {
            $isFollow = $topic->follow->where('uid', $this->uid)->count() ? 1 : 0;
        }

        return [
            'id' => $topic['id'],
            'name' => $topic['name'],
            'img' => $topic['img'],
            'follow_count' => getNumber($topic['use_count'] + $topic['base_count']),
            'is_follow' => $isFollow,
            'circle' => $this->getCircleInfo($topic['circle_id'])
        ];
    }

    public function getCircleInfo($circleId)
    {
        $circleInfo = InterestCircle::find($circleId);
        if ($circleInfo) {
            $circle['id'] = $circleInfo->id;
            $circle['name'] = $circleInfo->name;
        } else {
            $circle = new \stdClass();
        }
        return $circle;
    }
}