在Eloquent模型事件中获取先前的属性值 [英] Get previous attribute value in Eloquent model event

问题描述

是否可以在其saving或updating事件中查看模型属性的旧/先前值?

Is there a way to see the old/previous value of a model's attribute in its saving or updating event?

例如可能出现以下情况:

eg. Is something like the following possible:

User::updating(function($user)
{
    if ($user->username != $user->old->username) doSomething();
});

推荐答案

好吧，我很偶然地发现了这一点，因为它目前不在文档中.

Ok, I found this quite by chance, as it's not in the documentation at present...

有一个getOriginal()方法可用，该方法返回原始属性值的数组:

There is a getOriginal() method available which returns an array of the original attribute values:

User::updating(function($user)
{
    if ($user->username != $user->getOriginal('username')) {
        doSomething();
    }

    // If you need multiple attributes you may use:
    // $originalAttributes = $user->getOriginal();
    // $originalUsername = $originalAttributes['username']; 
});

请注意，它会忽略模型类型转换.

Be carefult, it ignores the model type casting.

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