Yii2验证注册身份证号不在死亡登记表中的实现求助

Got it! I see what you need here—your current exist validator is set to check if the ID exists in the deathregister table, but you want the exact opposite: verify that the input national ID does not belong to a deceased person.

Yii2's built-in exist validator has a simple but powerful negate property that flips its validation logic. Here's the adjusted code you need:

['identitynumber', 'exist', 
    'targetClass' => Deathregister::className(), 
    'targetAttribute' => ['nationalidnum' => 'idnum'],
    'negate' => true, // This line reverses the validation check
    'message' => 'The ID number supplied belongs to a deceased person.'
]

Key Changes Explained: #

• 'negate' => true: This is the critical addition. By default, exist checks if a matching record exists in the target table. Setting negate to true reverses this—now it will throw an error if a matching record is found in deathregister.
• Updated the error message slightly for better clarity (feel free to adjust this to match your system's tone).

If you're working with an older Yii2 version (pre-2.0.14, when negate was added), you could create a custom validator method as a fallback:

public function checkNotDeceased($attribute, $params)
{
    $exists = Deathregister::find()->where(['idnum' => $this->$attribute])->exists();
    if ($exists) {
        $this->addError($attribute, 'The ID number supplied belongs to a deceased person.');
    }
}

Then use it in your rules:

['identitynumber', 'checkNotDeceased'],

But the negate approach is the cleanest, built-in solution for modern Yii2 installations. Just double-check that your Deathregister model is properly imported, and the attribute mapping (nationalidnum from your form to idnum in the death table) is accurate.

内容的提问来源于stack exchange，提问作者Donaman86