mongo group

    public function test(){
        $app_id=1;
        $res= MongoClient::getInstance()->client()->callback(function (MongoClientDriver $driver) use($app_id){
            $options =[
                'group' => [
                    'ns' => 'ny_room_browse_record',
                    // '$reduce' => new MongoDB\BSON\JavaScript('function(doc, prev){prev.items.push(doc.FUserName);}'),
                    '$reduce' => 'function (obj, prev) { 
                        if (prev.create_time_max < obj.create_time) { 
                            prev.create_time_max = obj.create_time; 
                            prev.room_name=obj.room_name;
                            prev.room_desc=obj.room_desc;
                            prev.room_pic=obj.room_pic;
                            prev.id=obj._id.toString().substr(10,24);
                         }  
                    }',
                    'key' => [ 'room_id' => 1 ],
                    'initial' => ["room_name" =>'',"create_time_max"=> 0,'room_desc'=>'','room_pic'=>'','id'=>''],
                    'cond'=>[ 'wechat_user_space_id' => 1 ],
                ],
            ];
            
            $driver->getDb();
            $driver->collection = 'ny_room_browse_record';
            $ret = $driver->group($options);
            return $ret;
        });
        $this->writeJsonSelf(['code' => StatusCode::success,'msg' => 'success','data' => $res]);
    }