Laravel验证:存在其他列条件-自定义验证规则 [英] Laravel validation: exists with additional column condition - custom validation rule

问题描述

在Laravel中指定存在的验证规则时，是否可以引用另一个字段?我想说的是，输入a必须存在于表a中，输入b必须存在于表b中，并且表b中x列的值必须等于输入a.

Is there is a way of referencing another field when specifying the exists validation rule in Laravel? I want to be able to say that input a must exist in table a, input b must exist in table b AND the value for column x in table b must equal input a.

最佳示例解释:

public $rules = array(
    'game_id' => 'required|exists:games,id',
    'team1_id' => 'required|exists:teams,id,game_id,<game_id input value here>',
    'team2_id' => 'required|exists:teams,id,game_id,<game_id input value here>'
);

因此，根据我的验证规则，我希望能够确保:

So with my validation rules I want to be able to make sure that:

• game_id存在于games表(id字段)中
• team1_id存在于teams表(id字段)中，并且game_id列(在teams表中)必须等于game_id输入的值.
• 与上述team2_id
相同

• game_id exists within the games table (id field)
• team1_id exists within the teams table (id field) and the game_id column (in the teams table) must equal the value of the game_id input.
• As above for team2_id

因此，如果在我的表单中，我为game_id输入1，则我希望能够确保team1_id和team2_id的teams表中的记录的值都为1 game_id.

So, if in my form, I entered 1 for game_id, I want to be able to ensure that the record within the teams table for both team1_id and team2_id have the value 1 for game_id.

我希望这是有道理的.

谢谢

推荐答案

您需要自定义验证规则，为此我将创建一个单独的类.但是为了简洁起见，使用内联闭包几乎是相同的:

You want a custom validation rule, and I would create a separate class for this. But for brevity here's pretty much the same using inline closure:

// give it meaningful name, I'll go with game_fixture as an example
Validator::extend('game_fixture', function ($attribute, $value, $parameters, $validator) 
{
    if (count($parameters) < 4)
    {
        throw new \InvalidArgumentException("Validation rule game_fixture requires 4 parameters.");
    }

    $input    = $validator->getData();
    $verifier = $validator->getPresenceVerifier();

    $collection = $parameters[0];
    $column     = $parameters[1];
    $extra      = [$parameters[2] => array_get($input, $parameters[3])];

    $count = $verifier->getMultiCount($collection, $column, (array) $value, $extra);

    return $count >= 1;
});

然后简单地使用:

$rules = array(
    'game_id' => 'required|exists:games,id',

    // last parameter here refers to the 'game_id' value passed to the validator
    'team1_id' => 'required|game_fixture:teams,id,game_id,game_id',
    'team2_id' => 'required|game_fixture:teams,id,game_id,game_id'
);

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