无法使 "One To Many" 关系在 Laravel 中起作用

Question

这是我的控制器函数中的代码：

$topic = Topic::create([
          'title' => $request->input('title'),
          'content' => $request->input('content'),
          'tags' => $request->input('tags'),
      ]);
      $forum = Forum::find($frid); // $frid = Forum ID
      $topic->myforum($forum->id);// Not working
      $topic->myforum($forum);// Not working
      $topic->myforum()->associate($forum->id);// Not working
      $topic->myforum()->associate($forum);// Not working
      $topic->myforum()->attach($forum->id);// Not working
      $topic->myforum()->attach($forum);// Not working
      $topic->myforum = $forum;// Not working
      $topic->myforum = $forum->id;// Not working
      $topic->creator()->attach(Auth::user()->id);//Same Here
      $topic->save();

主题模型：

public function myforum()
{
     return $this->belongsTo('Forum', 'forum_id');
}


public function creator()
{
    return $this->belongsTo('User', 'user_id');
}

论坛模型：

public function topics()
{
    return $this->hasMany('Topic', 'forum_id');
}

用户模型：

public function topics()
{
    return $this->hasMany('Topic', 'user_id');
}

所以正如您在控制器中看到的那样，我尝试了我在互联网上找到的所有可能性，但没有一种可行，所以请提供任何想法

Answer 1

而不是

return $this->hasMany('Topic', 'user_id');

我们应该使用

return $this->hasMany('App\Topic', 'user_id');

因为即使我们添加 use App\Topic; 它也不起作用，我们必须这样做

无法使 "One To Many" 关系在 Laravel 中起作用

Can't make "One To Many" relation work in Laravel

controller

model

relation

eloquent

laravel-5.2