Laravel 中static方法为什么在相应的类中找不到
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 $instance; } </code>
这里的static::where()
是怎么回事,Shop::where()
是调用的哪里的where
方法
回复内容:
有一个名称为Shop的model,可以使用Shop::where("id",14)->first()
但在Illuminate\Database\Eloquent\Model
中却找不到where方法。不过在555行找到了使用where
的代码:
<code>if ( ! is_null($instance = static::where($attributes)->first())) { return $instance; } </code>
这里的static::where()
是怎么回事,Shop::where()
是调用的哪里的where
方法
看这一行代码
https://github.com/laravel/framework/blob/master/src/Illuminate/Database/Eloquent/Model.php#L3354
<code>php</code><code>public static function __callStatic($method, $parameters) { $instance = new static; return call_user_func_array(array($instance, $method), $parameters); } </code>
意思是如果静态方法找不到,会尝试实例化之后再次调用对象方法
<code>Model::where()到这里会变成$model->where() </code>
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>
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>
所以到最后,你调用到的是
<code>php</code><code>new \Illuminate\Database\Eloquent\Builder()->where() </code>
这个方法
<code>vendor\laravel\framework\src\Illuminate\Database\Query\Builder.php#384-457 </code>
补充:http://v4.golaravel.com/docs/4.2/facades

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