在查询生成器中不存在Only OnlyTrashed()

问题描述

我正在尝试从表消息中获取被破坏的行:

I am trying to get trashed rows from table messages:

public function trash() {
    return $this->onlyTrashed()
        ->where('user_id', '=', $this->_u)
        ->orWhere('receiver', '=', $this->_u)
        ->orderBy('deleted_at', 'desc')->get();
}

我收到此错误:

Method Illuminate\Database\Query\Builder::onlyTrashed does not exist.

我检查了Builder和SoftDeletes文件中的onlyTrashed方法，但它不存在，如何从消息表中查找被垃圾消息?

I checked up Builder and SoftDeletes files for onlyTrashed method and it does not exist, how can I look up to trashed messages from message table?

我想到的唯一方法是创建一种方法，该方法不返回delete_at不为null的消息，并且使回收站仅返回不为null的消息.但是我仍然想知道为什么这不起作用，因为它在此URL的文档中:

The only way I think about is to create method that doesn't return messages where delete_at is not null and for trashed to return only those where it is not null. But I am still wondering why this doesn't work since it is in documentation at this url:

https://laravel.com/docs/5.6/eloquent#soft-deleting

更多信息

是的，它在模型内部，是的，我添加了使用SoftDeletes的方法:

Yes it is inside model and yes I added use SoftDeletes:

use Illuminate\Database\Eloquent\SoftDeletes;-位于顶部

use SoftDeletes;打开课程后

让我在此处粘贴整个模型:

Let me paste entire model here:

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\SoftDeletes;
use Illuminate\Support\Facades\DB;

class Messages extends Model
{

use SoftDeletes;

protected $fillable = [
    'user_id', 'subject', 'text', 'receiver'
];

public $_u;

protected $dates = ['deleted_at'];

public function __construct() {
    $this->_u = auth()->user()->user_id; //or some id as string
}

public function trash() {
        return $this->onlyTrashed()
        ->where('user_id', '=', $this->_u)
        ->orWhere('receiver', '=', $this->_u)
        ->orderBy('deleted_at', 'desc')->get();
}

public static function trashed() {
        return self::onlyTrashed();
}
}

并且控制器具有:

public function __construct() {
        $this->middleware('auth');
    }

public function index($field = 'trash') {
    if ($field !== "new") {
        $messages = (new Msg)->$field();
        $user = auth()->user();
        return view('pages.messages', compact('messages', 'user'));
    }
    return view('pages.messages.new', compact('messages', 'user'));
}

我也尝试过调用static，并且尝试通过 tinker 进行调用，并且仍然不断获得:

I tried calling static as well and I tried doing it from tinker and still keep getting:

onlyTrashed()不存在

onlyTrashed() doesn not exist

推荐答案

您必须调用父构造函数:

You have to call the parent constructor:

public function __construct() {
    parent::__construct();

    $this->_u = auth()->user()->user_id;
}

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