Fixing ClassRegistry that was incorrectly checking class inheritance

Fixing Model class that was incorrectly sending model names to be instantiated
Fixing more FormHelper tests

lib/Cake/Model/Model.php

@@ -702,10 +702,13 @@ class Model extends Object {
 		}
 
 		if (!isset($this->{$assoc}) || $this->{$assoc}->name !== $className) {
-			$model = array('class' => $plugin . '.' . $className, 'alias' => $assoc);
+			if ($plugin) {
+				$plugin .= '.';
+			}
+			$model = array('class' => $plugin . $className, 'alias' => $assoc);
 			$this->{$assoc} = ClassRegistry::init($model);
 			if ($plugin) {
-				ClassRegistry::addObject($plugin . '.' . $className, $this->{$assoc});
+				ClassRegistry::addObject($plugin . $className, $this->{$assoc});
 			}
 			if ($assoc) {
 				$this->tableToModel[$this->{$assoc}->table] = $assoc;

lib/Cake/Test/Case/View/Helper/FormHelperTest.php

@@ -1882,7 +1882,7 @@ class FormHelperTest extends CakeTestCase {
 			'label' => array('for' => 'ObjectField'),
 			'Field',
 			'/label',
-			'input' => array('type' => 'text', 'name' => 'data[Object][field]', 'id' => 'ObjectField'),
+			'input' => array('type' => 'text', 'name' => 'data[Object][field]', 'id' => 'ModelField'),
 			'A message to you, Rudy',
 			'/div'
 		);

lib/Cake/Utility/ClassRegistry.php

@@ -135,16 +135,18 @@ class ClassRegistry {
 				App::uses($plugin . 'AppModel', $pluginPath . 'Model');
 				App::uses($class, $pluginPath . 'Model');
 
-				if (class_exists($class) && $class instanceof Model) {
+				if (class_exists($class)) {
 					${$class} = new $class($settings);
+					$$class = ($$class instanceof Mdoel) ? $$class : null;
+				}
+				if (!isset($$class) && $strict) {
+					return false;
+				} elseif ($plugin && class_exists($plugin . 'AppModel')) {
+					$appModel = $plugin . 'AppModel';
 				} else {
-					 if ($strict) {
-						return false;
-					} elseif ($plugin && class_exists($plugin . 'AppModel')) {
-						$appModel = $plugin . 'AppModel';
-					} else {
-						$appModel = 'AppModel';
-					}
+					$appModel = 'AppModel';
+				}
+				if (!empty($appModel)) {
 					$settings['name'] = $class;
 					${$class} = new $appModel($settings);
 				}

lib/Cake/View/Helper/FormHelper.php

@@ -156,11 +156,10 @@ class FormHelper extends AppHelper {
 				return $this->fieldset[$model]['key'];
 			}
 
-			if (!isset($this->fieldset[$model]['fields'])) {
-				$fields = $this->fieldset[$model]['fields'] = $object->schema();
-			}
-
 			if ($key === 'fields') {
+				if (!isset($this->fieldset[$model]['fields'])) {
+					$fields = $this->fieldset[$model]['fields'] = $object->schema();
+				}
 				if (empty($field)) {
 					foreach ($object->hasAndBelongsToMany as $alias => $assocData) {
 						$this->fieldset[$object->alias]['fields'][$alias] = array('type' => 'multiple');