laravel eloquent 嵌套评论和回复

问题描述

几天前，我看到一个网站，用户可以在其中评论帖子.其他用户可以回复.并且重播可以有像下面的示例截图一样的回复..

Few days ago, I saw a website where users can comment on a post. Other users can reply on that. and a replay can have replies like the example screenshot below..

所以我想试一试，但不知何故无法弄清楚.这是我的数据库设置

So I thought to give it a try but somehow couldnt figure it out. here is my database set up

Schema::create('comments', function (Blueprint $table) {
            $table->increments('id');
            $table->unsignedInteger('user_id');
            $table->unsignedInteger('post_id');
            $table->unsignedInteger('reply_id')->default(0);
            $table->text('body');
            $table->timestamps();
        });

模型中的关系

class Comment extends Model
{
    protected $fillable = [
        'user_id',
        'post_id',
        'reply_id',
        'body'
    ];

    public function user()
    {
        return $this->belongsTo(User::class);
    }

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

    public function replies()
    {
        return $this->hasMany(Comment::class,'reply_id','id');
    }

在控制器中

$comments = Comment::with('replies')->where('reply_id','=',0)->get(['id','reply_id','body']);
   return response($comments);

这完美地返回了评论和回复.但是如果有reply的回复，就不会显示了.我怎样才能做到这一点?需要建议.

this perfectly returns the comment and replies. But if there is a reply of reply, it doesnt show up. How can I do that? Need suggestion.

推荐答案

将 reply_id 与 nullable() parent_id 交换.所以基本上你想知道评论是否有父级.

Swap reply_id with a nullable() parent_id. So basically you want to know if a comment has a parent.

然后在Comment模型中，添加一个self关系来获取所有parent_id匹配的评论.

Then in Comment model, add a self relationship to take all comments whose parent_id match.

public function replies() {
    return $this->hasMany('AppComment', 'parent_id');
}

在您的视图中，您可以为每个评论及其回复嵌套循环

In your view you can have nested loops for each comments and its replies

@foreach($comments as $comment) 
   {{ $comment->content }}

   @if ( $comment->replies )
       @foreach($comment->replies as $rep1)
           {{ $rep1->content }}
           ...
       @endforeach
   @endif
@endforeach

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