在 Laravel 项目中为评论创建 Like 系统时遇到问题

Having trouble creating a Like system for comments in a Laravel Project

我正在使用 Laravel 创建一个项目。用户可以点赞评论。我想显示一个 "like" 按钮,以便用户可以喜欢评论,如果用户已经喜欢该评论,我希望该按钮是 "unlike" 这样用户就可以对喜欢的评论不喜欢

在我的数据库中我有一个赞table:

| id | user_id | comment_id |

我喜欢的模特是这样的:

class Like extends \Eloquent {

    protected $fillable = ['user_id', 'comment_id'];
    protected $table = 'likes';

    public function owner()
    {
        return $this->belongsTo('Acme\Users\User', 'user_id');
    }
}

评论模型如下所示:

class Comment extends \Eloquent {

    protected $fillable = ['user_id', 'post_id', 'body'];
    protected $table = 'comments';

    public function owner()
    {
        return $this->belongsTo('Acme\Users\User', 'user_id');
    }
    public function likes()
    {
        return $this->hasMany('Acme\Likes\Like');
    }
}

用户模型:

class User extends Eloquent {

    public function comments()
    {
        return $this->hasMany('Acme\Comments\Comment');
    }
    public function likes()
    {
        return $this->hasMany('Acme\Likes\Like');
    }

}

喜欢控制器:

class LikesController extends \BaseController {

use CommanderTrait;

/**
 * Like a comment
 * @return Response
 */
public function commentLike()
{
// using a command bus. Basically making a post to the likes table assigning user_id and comment_id then redirect back
    extract(Input::only('user_id', 'comment_id'));
    $this->execute(new CommentLikeCommand($user_id, $comment_id));

    return Redirect::back();
}
public function unlike()
{
    $like = new Like;
    $user = Auth::user();
    $id = Input::only('comment_id');
    $like->where('user_id', $user->id)->where('comment_id', $id)->first()->delete();
    return Redirect::back();
}
}

在我看来,我可以通过 $comment 获取评论,并且可以通过 $comment->like have:

@foreach($post->comments as $comment)
<div class="user-comment">
    <p class="comment">
        {{ $comment->owner->first_name }}&nbsp;{{ $comment->owner->last_name }}&nbsp;{{ $comment->body }}
    </p>

    <div class="com-details">
<!-- how long ago the comment was posted -->
    <div class="com-time-container">
        &nbsp;{{ $comment->created_at->diffForHumans() }} ·
    </div>

<!-- HERE IS WHERE I WANT THE LIKE AND UNLIKE BUTTONS TO DISPLAY -->
    @if ($comment->likes->owner->id === $currentUser->id)
        {{ Form::open(['route' => 'like']) }}
            {{ Form::hidden('user_id', $currentUser->id) }}
            {{ Form::hidden('comment_id', $comment->id) }}
            <button type="submit" class="com-like">Like</button>
        {{ Form::close() }}
    @else
        {{ Form::open(['route' => 'unlike']) }}
            {{ Form::hidden('user_id', $currentUser->id) }}
            {{ Form::hidden('comment_id', $comment->id) }}
            <button type="submit" class="com-like">Unlike</button>
        {{ Form::close() }}
    @endif
<!-- how many users like this comment -->
    <span class="likes"> · {{ $comment->likes->count() }}</span>
    </div>
</div><!--user-comment end-->
@endforeach

我正在尝试设置一个 if 语句来查看当前用户是否喜欢该状态,但我不确定这是如何完成的?如果用户还没有喜欢评论,我希望显示 "like" 按钮。如果用户喜欢我希望显示 "unlike" 按钮的评论。我以为我可以说 @if($comment->likes->owner->id === $currentUser->id) 但我得到未定义 属性。我该怎么做?

我用 Laravel 的工作不多,所以我的语法和术语可能有点偏差,但它应该是正确的想法。

基本上,$comment->likes 是该评论的点赞列表。您需要遍历这些点赞并检查其中一个点赞是否来自当前用户。如果其中之一是当前用户,则显示不同按钮。否则,显示赞按钮。

不确定在 Blade 中会是什么样子,但这里有一些伪代码:

$currentUserLiked = false;

// go through all of the comment's likes
foreach ($comment->likes as $like)
{
    // check if this like is by the current user
    if ($like->owner->id == $currentUser->id)
    {
        $currentUserLiked = true;
        break;
    }
}

if ($currentUserLiked)
{
    showUnlikeButton();
}
else
{
    showLikeButton();
}

$comment->likesLike 个对象的集合。要访问 owner 属性,您需要迭代集合。

但是,另一种选择是使用集合中的可用方法来执行您需要的操作:

@if (in_array($currentUser->id, $comment->likes->lists('user_id')))

$comment->likes->lists('user_id') 将 return 一个数组,其中包含评论的点赞集合中的所有 user_id 值。 in_array() 将检查 $currentUser->id 是否在该数组中。