midi-php/application/api/model/Topic.php

<?php

namespace app\api\model;

use think\Db;
use think\Model;

class Topic extends Model
{
    //  获取话题列表
    public function get_topic_list($page, $page_limit)
    {
        $list = $this->field('id as topic_id,content,pic,title')->where(['is_delete'=>1,'type'=>1])->page($page, $page_limit)->select();
        return $list;
    }

    //获取动态引用最多的话题
    public function get_zone_topic()
    {
        //查询动态表fa_user_zone_topic里面 topic_id 字段 使用次数最多的12条
        $list = db::name('user_zone_topic')
            ->field('topic_id,count(topic_id) as count')
            ->where('topic_id', '<>', 0)
            ->order('count desc')->limit(12)
            ->group('topic_id')
            ->select();

        //获取数组中topic_id
        $topic_ids = array_column((array)$list, 'topic_id');

        //不够12条，查询话题表fa_topic里面最新的补够12条
        if(count($list) < 12){
            $topic_list = $this->field('id as topic_id')
                ->where(['is_delete'=>1,'type'=>1,'id'=>['not in',$topic_ids]])
                ->order('id desc')->limit(12 - count($list))
                ->select();
            $topic_list = array_map(function($item){
                $item['count'] = 0;
                return $item;
            }, (array)$topic_list);
            $list = array_merge((array)$list,$topic_list);
        }

        if($list){
            foreach ($list as &$item){
                $item['content'] = $this->where(['id'=>$item['topic_id']])->value('content');
                $item['pic'] = $this->where(['id'=>$item['topic_id']])->value('pic') ?? get_system_config_value('web_site').'/data/avatar/head_pic.png';;
                $item['title'] = $this->where(['id'=>$item['topic_id']])->value('title');
            }
        }
        return $list;
    }


}