first() 但在IlluminateDatabaseEloquentModel中却找不到where方法。不过在555行找到了使用where的代码: {代码...} 这里的static::where()是怎么..." /> first() 但在IlluminateDatabaseEloquentModel中却找不到where方法。不过在555行找到了使用where的代码: {代码...} 这里的static::where()是怎么...">
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Home Backend Development PHP Tutorial Laravel 中static方法为什么在相应的类中找不到

Laravel 中static方法为什么在相应的类中找不到

Jun 06, 2016 pm 08:39 PM
laravel php

有一个名称为Shop的model,可以使用Shop::where("id",14)->first()
但在Illuminate\Database\Eloquent\Model中却找不到where方法。不过在555行找到了使用where的代码:

<code>if ( ! is_null($instance = static::where($attributes)->first()))
{
    return $instance;
}
</code>
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这里的static::where()是怎么回事,Shop::where()是调用的哪里的where方法

回复内容:

有一个名称为Shop的model,可以使用Shop::where("id",14)->first()
但在Illuminate\Database\Eloquent\Model中却找不到where方法。不过在555行找到了使用where的代码:

<code>if ( ! is_null($instance = static::where($attributes)->first()))
{
    return $instance;
}
</code>
Copy after login
Copy after login

这里的static::where()是怎么回事,Shop::where()是调用的哪里的where方法

看这一行代码
https://github.com/laravel/framework/blob/master/src/Illuminate/Database/Eloquent/Model.php#L3354

<code>php</code><code>public static function __callStatic($method, $parameters)
{
    $instance = new static;
    return call_user_func_array(array($instance, $method), $parameters);
}
</code>
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意思是如果静态方法找不到,会尝试实例化之后再次调用对象方法

<code>Model::where()到这里会变成$model->where()
</code>
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再继续看
https://github.com/laravel/framework/blob/master/src/Illuminate/Database/Eloquent/Model.php#L3335
这行代码

<code>php</code><code>public function __call($method, $parameters)
{
    if (in_array($method, array('increment', 'decrement')))
    {
        return call_user_func_array(array($this, $method), $parameters);
    }
    $query = $this->newQuery();
    return call_user_func_array(array($query, $method), $parameters);
}
</code>
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意思是如果本身再没有->where()这个方法,会再次尝试实例化一个\Illuminate\Database\Eloquent\Builder对象并填充当前已经设置过的一些参数,再进行操作

<code>到这里Model::where()会变成 $model->newQuery()->where()
</code>
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所以到最后,你调用到的是

<code>php</code><code>new \Illuminate\Database\Eloquent\Builder()->where()
</code>
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这个方法

<code>vendor\laravel\framework\src\Illuminate\Database\Query\Builder.php#384-457
</code>
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补充:http://v4.golaravel.com/docs/4.2/facades

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