Yii2 dependency custom rule validation

问题

I have two input fields consider A and B, now i want to validate that user can input at least one field that is either A or B field.

Is there a way to create a rule condition?

回答1:

Add like this in rules

public function rules()
{
    return [

        [['field_A'],'required','when' => function($model) {

            return $model->field_B == NULL;

        }, 'message' => 'Either field_A or field_B is required.'],

        [['field_B'],'required','when' => function($model) {

            return $model->field_A == NULL;

        }, 'message' => 'Either field_A or field_B is required.'],

}

回答2:

You may create individual rule with use closure. Like that:

[['field_a', 'field_b'], function ($attribute, $params) {
                // your code
            }]

See more in doc

来源：https://stackoverflow.com/questions/29432786/yii2-dependency-custom-rule-validation