Laravel 模型关联不同数据库之间能否使用关联模型？

  可以关联起来查询的，写了个小demo如下:
     $mongoCollection = DB::connection('mongodb')->collection('｛此处是你mongodb的表名｝');
     $mongoCollection->chunk(1000, function($users) {
            foreach ($users as $user) {
                $phone = $user['_id'];
                $br = ｛此处mysql的表名｝::find($phone)；
                $br->nm = $name;
                $br->save();
            }
        });Copy

$mongo = new MongodbUser();
$mongo->all()->map(function($item){
  return $item->mysqlUserProfile;
});Copy

protected function newRelatedInstance($class)
    {
        return tap(new $class, function ($instance) {
            if (! $instance->getConnectionName()) {
                $instance->setConnection($this->connection);
            }
        });
    }Copy