BadMethodCallException使用children_comments()

Question

我目前正试图做出评论回复(线程-ish)，我一直收到一个错误的回复：

对未定义方法Illuminate\Database\Query\Builder::children_comments()的BadMethodCallException调用

以下是我的方法：

public function commentsReply(Requests\CreateCommentsRequest $request, $comment)
{
$comments = Comments::whereId($comment)->first();

    $comment = new ChildrenComment(Request::all());
    $comment->pubslished_at = Carbon::now();
    $comment->user()->associate(Auth::user());
    $comment->children_comments()->associate($comments);
    $comment->save();

    return Redirect::back();
}

这是我的模型：

<?php namespace App;

use Illuminate\Database\Eloquent\Model;
use Carbon\Carbon;

class ChildrenComment extends Model {
protected $fillable = [
        'id',
        'user_id',
        'post_id',
        'parent_id',
        'comment'
    ];

    public function setPublishedAtAttribute($date)
    {
        $this->attributes['pubslished_at'] = Carbon::parse($date);
    }

    public function user()
    {
        return $this->belongsTo('App\User');
    }
    public function comments()
    {
        return $this->belongsTo('App\Comments');
    }

}

如果有必要，这里是我的迁移模式：

public function up()
{
    Schema::create('children_comments', function(Blueprint $table)
    {
        $table->increments('id');
        $table->integer('user_id')->unsigned();
        $table->integer('post_id')->unsigned();
        $table->integer('parent_id')->unsigned();
        $table->text('comment');
        $table->string('fileToUpload')->default("uploads/images/comments/NFF4D00-0.png");
        $table->timestamps();;
        $table->foreign('user_id')
                    ->references('id')
                    ->on('users')
                    ->onDelete('cascade');
        $table->foreign('post_id')
                ->references('id')
                    ->on('posts')
                    ->onDelete('cascade');
        $table->foreign('parent_id')
                    ->references('id')
                    ->on('comments')
                    ->onDelete('cascade');
    });
}

Answer 1

您正在错误地调用associate方法。这里调用的方法children_comments()在任何地方都不存在：

$comment->children_comments()->associate($comments);

要将Comments与ChildrenComment关联起来，您应该这样做：

$comment->comments()->associate($comments);

最后一个注意事项:我发现您命名变量的方式非常混乱(特别是因为您使用的是一个带有单个值的变量的复数形式)。我会这样做的：

//is't only one comment so 'comment' not 'comments'
$comment = Comments::whereId($comment)->first();

//$childComment is another object, so give it another name
$childComment = new ChildrenComment(Request::all());
$childComment->pubslished_at = Carbon::now();
$childComment->user()->associate(Auth::user());

//this statement represent a relation with one element, so name it 'comment()', not 'comments()'
$childComment->comment()->associate( $comment );
$childComment->save();

我认为这会使它更易读懂。