Fixing issue in Containable where if bindModel was used to add / chan…

…ge a binding not permanently, Containable was making the change permanent

cake/libs/model/behaviors/containable.php

@@ -129,7 +129,11 @@ function beforeFind(&$Model, $query) {
 			if ($contain) {
 				$backupBindings = array();
 				foreach ($this->types as $relation) {
-					$backupBindings[$relation] = $instance->{$relation};
+					if (!empty($instance->__backAssociation[$relation])) {
+						$backupBindings[$relation] = $instance->__backAssociation[$relation];
+					} else {
+						$backupBindings[$relation] = $instance->{$relation};
+					}
 				}
 				foreach ($this->types as $type) {
 					$unbind = array();

cake/tests/cases/libs/model/behaviors/containable.test.php

@@ -3311,6 +3311,31 @@ function testOriginalAssociations() {
 		$this->assertTrue(Set::matches('/Comment[article_id=1]', $result));
 		$this->Article->resetBindings();
 	}
+/**
+ * testResetAddedAssociation method
+ *
+ * @access public
+ */
+	function testResetAddedAssociation() {
+		$this->assertTrue(empty($this->Article->hasMany['ArticlesTag']));
+
+		$this->Article->bindModel(array(
+			'hasMany' => array('ArticlesTag')
+		));
+		$this->assertTrue(!empty($this->Article->hasMany['ArticlesTag']));
+
+		$result = $this->Article->find('first', array(
+			'conditions' => array('Article.id' => 1),
+			'contain' => array('ArticlesTag')
+		));
+		$expected = array('Article', 'ArticlesTag');
+		$this->assertTrue(!empty($result));
+		$this->assertEqual('First Article', $result['Article']['title']);
+		$this->assertTrue(!empty($result['ArticlesTag']));
+		$this->assertEqual($expected, array_keys($result));
+
+		$this->assertTrue(empty($this->Article->hasMany['ArticlesTag']));
+	}
 /**
  * testResetAssociation method
  *