CrudKit\Data\ArrayDataProvider::getValidatorForField PHP Method

    protected function getValidatorForField($formKey)
    {
        $validator = null;
        if (isset($this->schema[$formKey]['options']['validator'])) {
            $validator = $this->schema[$formKey]['options']['validator'];
            if (!is_callable($validator)) {
                $validator = null;
            }
        }
        return $validator;
    }