Bug fixed. saveAll with validation option "only" or "first" works wll.

saveAll() did set null foreign key when it just validates. I've
assigned numeric validation on the hasMany side model and validation
did fail with this behavior. I've changed this not to set foreign key
when it just validation.

cake/libs/model/model.php

@@ -1687,7 +1687,10 @@ function saveAll($data = null, $options = array()) {
 					$type = $associations[$association];
 					switch ($type) {
 						case 'hasOne':
-							$values[$this->{$type}[$association]['foreignKey']] = $this->id;
+							if (!$validating) {
+								$values[$this->{$type}[$association]['foreignKey']] = $this->id;
+							}
+
 							if (!$this->{$association}->__save($values, $options)) {
 								$validationErrors[$association] = $this->{$association}->validationErrors;
 								$validates = false;
@@ -1697,9 +1700,12 @@ function saveAll($data = null, $options = array()) {
 							}
 						break;
 						case 'hasMany':
-							foreach ($values as $i => $value) {
-								$values[$i][$this->{$type}[$association]['foreignKey']] =  $this->id;
+							if (!$validating) {
+								foreach ($values as $i => $value) {
+									$values[$i][$this->{$type}[$association]['foreignKey']] =  $this->id;
+								}
 							}
+
 							$_options = array_merge($options, array('atomic' => false));
 
 							if ($_options['validate'] === 'first') {