CakePHP AssocFieldValidationBehavior

assoc_field_validation.php

<?php
class AssocFieldValidationBehavior extends ModelBehavior
{
	public function checkAssocField($Model, $check, $assocField, $assocValueList = null, $delegateRule = null)
	{
		$key = 0;

		if (is_array($check)) {
			list($key, $check) = each($check);
		}

		if (strpos($assocField, '.') !== false) {
			list($model, $assocField) = $assocField;

		} else {
			$model = $Model->alias;
		}

	    	$assocValue = Set::extract($Model->data, "{$model}.{$assocField}");

		if ($this->_isValidator($assocValueList) || !$assocValueList) {
			$assocValueList = null;
		}

		if (empty($assocValue) || ($assocValueList && !in_array($assocValue, (array)$assocValueList))) {
			return true;
		}

		if ($this->_isValidator($delegateRule) || !$delegateRule) {
			$delegateRule = 'notEmpty';
		}

		if (is_array($delegateRule)) {
			$rule = array_shift($delegateRule);
			$ruleParams = array_merge(array($check), $delegateRule);

		} else {
			$rule = $delegateRule;
			$ruleParams = array($check);
		}

		$Validation = Validation::getInstance();
		$methods = array_map('strtolower', get_class_methods($Model));
		$behaviorMethods = array_diff(array_keys($Model->Behaviors->methods()), array(__FUNCTION__));

		if (in_array(strtolower($rule), $methods)) {
			$ruleParams[0] = array($key => $check);
			$valid = $Model->dispatchMethod($rule, $ruleParams);

		} else if (in_array($rule, $behaviorMethods) || in_array(strtolower($rule), $behaviorMethods)) {
			$ruleParams[0] = array($key => $check);
			$valid = $this->Behaviors->dispatchMethod($this, $rule, $ruleParams);

		} else if (method_exists($Validation, $rule)) {
			$valid = $Validation->dispatchMethod($rule, $ruleParams);

		} else if (!is_array($delegateRule)) {
			$valid = preg_match($rule, $check);

		} else {
			$valid = false;
		}

		return $valid;
	}

	protected function _isValidator($array)
	{
		return (is_array($array) && isset($array['allowEmpty'], $array['required']));
	}
}