mysql - 一对多关系，排序和过滤子项

Question

我想显示所有喜欢该用户的帖子。好的。我可以用这个:

$user = User::where('slug', $user->slug)
                  ->first();
dd($user->likes);

但这不是我想做的。任何帖子都必须由版主 (->where('accept', 1)) 和 orderign (->orderBy('created_at', 'desc')) 接受。 谁知道我该怎么做？ 目前我有2个模型。我的人际关系:

//Post
    public function likes(){
      return $this->hasMany('App\Like');
    }
//Likes
    public function post(){
      return $this->belongsTo('App\Post');
    }
//migrate of likes look like this
        Schema::create('likes', function (Blueprint $table) {
            $table->bigIncrements('id');
            $table->integer('user_id');
            $table->integer('post_id');
            $table->timestamps();
        });

我该如何解决我的问题？

Answer 1

您可以使用“赞”作为枢纽，在用户和帖子之间建立 M:N 关系。

# User model
public function likes()
{
    return $this->hasMany(Likes::class, 'user_id');
}

public function liked_posts()
{
    return $this->belongsToMany(Post::class, 'likes', 'user_id', 'post_id');
}

# Likes model
public function post()
{
    return $this->belongsTo(Post::class);
}

你可以像你一样设置它，用户有很多喜欢属于帖子。

// Using only likes and Likes's post relationship
$user = User::with(['likes.post' => function ($posts) {
    $posts->where('accept', 1)->orderBy('created_at', 'desc');
}])->where('slug', $slug)->first();

或者您可以使用 M:N 关系。

// Using the liked_posts relationship
$user = User::with(['liked_posts' => function ($posts) {
    $posts->where('accept', 1)->orderBy('created_at', 'desc');
}])->where('slug', $slug)->first();