laravel 调用未定义的方法 Illuminate\Database\Eloquent\Relations\HasMany::withTimestamps()

Call to undefined method Illuminate\Database\Eloquent\Relations\HasMany::withTimestamps()

提问by Solomon Antoine

I am trying to create a relationship in laravel with timestamps. I have this app that allows customers to request a job to a marketplace. When a freelancer on the marketplace finds a job their interested in they propose to complete the job and a new row is queried into the freelancer table.

我正在尝试在 laravel 中创建带有时间戳的关系。我有这个应用程序，允许客户向市场请求工作。当市场上的自由职业者找到他们感兴趣的工作时，他们建议完成该工作，并且在自由职业者表中查询新行。

Here is the code creating the relation:

这是创建关系的代码：

$marketplace->freelancers()->create([
   'request_id' => $id,
   'user_id' => $user->id
]);

Here is the Marketplace Model relationship code:

这是市场模型关系代码：

    /**
     * A request may have multiple freelancers
     * @return \Illuminate\Database\Eloquent\Relations\HasMany
     */
    public function freelancers()
    {
        return $this->hasMany('App\Models\MainFreelancers')->withTimestamps();
    }

Here is the Freelancer Model relationship code:

这是自由职业者模型关系代码：

/**
 * @return \Illuminate\Database\Eloquent\Relations\BelongsTo
 */
public function mainMarketplace()
{
    return $this->belongsTo('App\Models\MainMarketplace');
}

When trying to run the very first code block I keep getting this Laravel Error: BadMethodCallException Call to undefined method Illuminate\Database\Eloquent\Relations\HasMany::withTimestamps()

尝试运行第一个代码块时，我不断收到此 Laravel 错误： BadMethodCallException Call to undefined method Illuminate\Database\Eloquent\Relations\HasMany::withTimestamps()

In the short term, I just manually added a strtotime()but I'd prefer to utilize what Laravel offers. Does anyone have suggestions?

在短期内，我只是手动添加了一个，strtotime()但我更愿意使用 Laravel 提供的功能。有没有人有建议？

Note I have reference a previous stackoverflow question here: Timestamps are not updating while attaching data in pivot tableBut unfortunately it didn't help.

注意我在这里参考了以前的计算器溢出问题： 在数据透视表中附加数据时时间戳没有更新但不幸的是它没有帮助。

回答by Angad Dubey

withTimestamps();is used in Many to Many relationships where you want to declare that there are created_at and updated_at columns in the join table.

withTimestamps();用于多对多关系中，您要在其中声明连接表中有 created_at 和 updated_at 列。

$withTimestamps Indicates if timestamps are available on the pivot table.

$withTimestamps 指示数据透视表上是否有时间戳可用。

As the exception rightly points out, Illuminate\Database\Eloquent\Relations\HasManydoes not have a withTimestamps()method.

正如异常正确指出的那样，Illuminate\Database\Eloquent\Relations\HasMany没有withTimestamps()方法。

https://laravel.com/api/5.7/Illuminate/Database/Eloquent/Relations/HasMany.html

https://laravel.com/api/5.7/Illuminate/Database/Eloquent/Relations/HasMany.html

回答by Elisha Senoo

If you want your pivot table to have automatically maintained created_at and updated_at timestamps, use the withTimestamps method on the relationship definition:

return $this->belongsToMany('App\Role')->withTimestamps();

如果您希望数据透视表自动维护 created_at 和 updated_at 时间戳，请在关系定义上使用 withTimestamps 方法：

return $this->belongsToMany('App\Role')->withTimestamps();

Eloquent relationships.

雄辩的关系。

In the case of a belongs to manyrelationship, withTimestamps()manages your timestamps for you automatically. But you are implementing a has manyrelationship, so you have direct access to the timestamps.

在属于多关系的情况下，withTimestamps()自动为您管理您的时间戳。但是您正在实现一个has many关系，因此您可以直接访问时间戳。

Int this case, you can use an accessor in your model to format the date:

在这种情况下，您可以在模型中使用访问器来格式化日期：

public function getCreatedAtAttribute()
    {
        return date("l jS \of F Y h:i:s A", strtotime($this->attributes['created_at']));
    }