Laravel 中带保释和不带保释的验证规则有什么区别？

Question

If any of this rules failed, it'll be stop

And it’s gonna be the same here, isn’t it?

Answer 1

根据文档 https://laravel.com/docs/9.x/validation#stopping-on-first-validation-failure:

Sometimes you may wish to stop running validation rules on an attribute after the first validation failure. To do so, assign the bail rule to the attribute.

也许它对简单验证没有用，但如果第一次验证失败，您可能希望避免验证 closure 或 unique 验证。

假设您有这样的验证

$request->validate([
    'title' => 'max:255|unique:posts'
]);

如果不使用 bail，尽管 max:255 验证失败，unique:posts 仍会访问您的数据库以寻找唯一的 post。

或进行闭包验证：

$request->validate([
    'title' => [
        'max:255', 
        function ($attribute, $value, $fail) {
            $posts = Post::where('title', 'LIKE', $value)->count();
            if ($posts > 0) {
                $fail('The '.$attribute.' is invalid.');
            }
        },
     ],
]);

想象一下，有 500K posts，尽管 max:255 失败，但寻找具有相同标题的 post。

Answer 2

小伙伴看看错误信息，你会发现提供“保释”时只检查了一个验证条件

//when "bail" is not provided
$request->validate([
   'foo' => 'required|min:5|in:er,err,erro,error'
]);
/*
#messages: array:1 [
    "foo" => array:2 [
         0 => "The foo must be at least 5 characters."
         1 => "The selected foo is invalid."
    ]
]
*/

//when "bail" is provided
$request->validate([
    'foo' => 'bail|required|min:5|in:er,err,erro,error'
]);

/*

#messages: array:1 [
    "foo" => array:1 [
        0 => "The foo must be at least 5 characters."
    ]
]
*/

Laravel 中带保释和不带保释的验证规则有什么区别？

What's the difference between validation rules with bail and without in Laravel?

validation

laravel