Question

我正在使用lumen和Vuejs，并将我的“喜欢”和“评论”表与我的posts表连接在一起。喜欢没有问题，一切正常。但是，当我加入评论表时，帖子返回的次数与评论的存在次数相同。

 if($request->limit == NULL){
        $request->limit = 4;
      }

      $user_name= $request->username;
      $post_id = $request->id;

      $user = User::where('username', $user_name)->first();

      $post_query = Posts::leftJoin('likes', 'posts.id', '=', 'likes.post_id')
                   ->leftJoin('comments', 'posts.id', '=', 'comments.post_id')
                      ->selectRaw('posts.*, count(likes.post_id) as likes')
                   ->selectRaw('posts.*, comments.comment as comment')
                      ->where('posts.user_id', $user->id)
                      ->groupBy('posts.id')
                   ->groupBy('comments.id')
                      ->orderBy('id', 'desc')
                      ->limit($request->limit)
                      ->get();

      return response()->json($post_query);

我的代码输出为：

{
    "id": 844,
    "user_id": 221,
    "content": "Das ist mein aller erster Post :) ",
    "created_at": "2019-07-01 09:09:00",
    "updated_at": "2019-07-01 09:09:00",
    "likes": 1,
    "comment": "Das ist der zweite Kommentar"
},
{
    "id": 844,
    "user_id": 221,
    "content": "Das ist mein aller erster Post :) ",
    "created_at": "2019-07-01 09:09:00",
    "updated_at": "2019-07-01 09:09:00",
    "likes": 1,
    "comment": "das ist der dritte :) "
}

但是我想做的是：

{
    "id": 844,
    "user_id": 221,
    "content": "Das ist mein aller erster Post :) ",
    "created_at": "2019-07-01 09:09:00",
    "updated_at": "2019-07-01 09:09:00",
    "likes": 1,
    "comments": {
      {
        'username' : 'test',
        'comment' : "Das ist der zweite Kommentar",
        'created_at': 12312312
      },
      {
        'username' : 'test',
        'comment' : "Das ist der dritte :)",
        'created_at': 12312312
      }
    }
}

您对我该怎么做有任何想法吗？

Answer 1

您可以在定义了relationships的情况下使用Eloquent：

Post.php

class Post extends Model {

    public function comments()
    {
        return $this->hasMany(Comment::class);
    }

    public function likes()
    {
        return $this->hasMany(Like::class);
    }
}

然后在您的查询中

$posts = Post
             ::with('comments') // Eager loading the 'comments' relationship
             ->withCount('likes') // Attaching a 'likes_count' to every Post object
             ->orderBy('id', 'desc')
             ->limit($request->limit)
             ->get(); // executing the query

这将输出如下结果：

{
    "id": 844,
    "user_id": 221,
    "content": "Das ist mein aller erster Post :) ",
    "created_at": "2019-07-01 09:09:00",
    "updated_at": "2019-07-01 09:09:00",
    "likes_count": 1,
    "comments": {
      {
        'username' : 'test',
        'comment' : "Das ist der zweite Kommentar",
        'created_at': 12312312
      },
      {
        'username' : 'test',
        'comment' : "Das ist der dritte :)",
        'created_at': 12312312
      }
    }
}

在文档中检查与此解决方案相关的主题：

帖子返回的次数是存在评论的次数。我怎样才能解决这个问题？

1 个答案: