Question

首先，我为糟糕的英语道歉。我现在正在使用laravel（版本5.4.24）为站点帖子创建一个投票按钮。

如果我在代码中使用<button>，则单击屏幕上的投票按钮时它不起作用。所以，作为替代方案，我使用表单传递了值，但是这个方法似乎没有在验证中正确传递json的值。

问题出现在“这里”部分，如果我删除ArticleController.php的“here”部分并单击该按钮，则它没有up或down值。如果我删除“part”并运行它，laravel将显示以下错误：

SQLSTATE [42S22]: Column not found: 1054 Unknown column '' in 'field list' (SQL: SELECT sum (` `) as aggregate from` votes` where `votes`.`article_id` = 107 and` votes`. `article_id` is not null)

我一直在寻找一种方法，但我找不到答案。

感谢您的帮助。谢谢。

show.blade.php

//<form ...> </ form> is code that was not in the example, but if I click on 
<button> without it, there is no response on the screen.(No redirects)
<div class="action__article">
<form action="{{ route('videos.vote', $article->id) }}" method="post">
@if ($currentUser)
{!! csrf_field() !!}
<button class="btn__vote__article" data-vote="up" title="{{ trans('forum.comments.like') }}" {{ $voted }}>
<i class="fa fa-heart"></i>
<span>{{ $article->up_count }}</span>
</button>
@endif
</form>
</div>

* index.blade.php

@section('script')
@parent
<script type="text/javascript" charset="utf-8">
$.ajaxSetup({
  headers: {
      'X-CSRF-TOKEN': $('meta[name="csrf-token"]').attr('vote')
 }
});

$('.btn__vote__article').on('click', function(e) {
  var self = $(this),
    articleId = $article['id'];
  $.ajax({
    type: 'POST',
    url: '/video/' + articleId + '/votes',
    data: {
      vote: self.data('vote')
    }
  }).then(function (data) {
    self.find('span').html(data.value).fadeIn();
    self.attr('disabled', 'disabled');
    self.siblings().attr('disabled', 'disabled');
  });
});
</script>
@endsection

* ArticleController.php

public function vote(Request $request, \App\Article $article)
{
   //"here" - The value received from the form will not pass here and will be redirected to the previous page.
    $this->validate($request, [
        'vote' => 'required|in:up,down',
    ]);

    if ($article->votes()->whereUserId($request->user()->id)->exists()) {
        return response()->json(['error' => 'already_voted'], 409);
    }

    $up = $request->input('vote') == 'up' ? true : false;

    $article->votes()->create([
        'user_id'  => $request->user()->id,
        'up'       => $up,
        'down'     => ! $up,
        'voted_at' => \Carbon\Carbon::now()->toDateTimeString(),
    ]);

    return response()->json([
        'voted' => $request->input('vote'),
        'value' => $article->votes()->sum($request->input('vote')),
    ], 201, [], JSON_PRETTY_PRINT);
}

$ article = new App \ Article; $ request = new App \ Http \ Requests \ ArticlesRequest;

*模型

class Vote extends Model
{
    /**
     * Indicates if the model should be timestamped.
     *
     * @var bool
     */
    public $timestamps = false;

    /**
     * The attributes that are mass assignable.
     *
     * @var array
     */
    protected $fillable = [
        'user_id',
        'up',
        'down',
        'voted_at',
    ];

    /**
     * The attributes that should be visible in arrays.
     *
     * @var array
     */
    protected $visible = [
        'user_id',
        'up',
        'down',
    ];

    /**
     * The attributes that should be mutated to dates.
     *
     * @var array
     */
    protected $dates = [
        'voted_at',
    ];

    /* Relationships */

    public function articles()
    {
        return $this->belongsTo(Article::class);
    }

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

    /* Mutators */

    public function setUpAttribute($value)
    {
        $this->attributes['up'] = $value ? 1 : null;
    }

    public function setDownAttribute($value)
    {
        $this->attributes['down'] = $value ? 1 : null;
    }
}

*数据库

MariaDB [mmdance]> desc votes
    -> ;
+------------+------------------+------+-----+-------------------+----------------------------               -+
| Field      | Type             | Null | Key | Default           | Extra                                      |
+------------+------------------+------+-----+-------------------+----------------------------               -+
| id         | int(10) unsigned | NO   | PRI | NULL              | auto_increment                             |
| user_id    | int(10) unsigned | NO   | MUL | NULL              |                                            |
| article_id | int(10) unsigned | NO   | MUL | NULL              |                                            |
| up         | tinyint(4)       | YES  |     | NULL              |                                            |
| down       | tinyint(4)       | YES  |     | NULL              |                                            |
| voted_at   | timestamp        | NO   |     | CURRENT_TIMESTAMP | on update CURRENT_TIMESTAMP                |
+------------+------------------+------+-----+-------------------+----------------------------               -+
6 rows in set (0.00 sec)

Answer 1

问题在于你在这里传递$request的实例，你需要传递这样的字段名称

return response()->json([
        'voted' => $request->input('vote'),
        'value' => $article->votes()->sum('vote'),
    ], 201, [], JSON_PRETTY_PRINT);
}

Click here了解sum()如何运作

Answer 2

这是因为您可能没有数据库表中的字段，或者您没有在下面的模型中添加任何字段。

protected $fillable = [
    'user_id',
    'up',
    'down',
    'voted_at',
];

laquvel5

2 个答案: