Only saving properties that were marked as dirty

Cake/ORM/Table.php

@@ -711,8 +711,16 @@ protected function _processSave($entity, $options) {
 
 		$schema = $this->schema();
 		$data = array_intersect_key($data, array_flip($schema->columns()));
+		$keys = array_keys($data);
+
+		foreach ($keys as $i => $property) {
+			if (!$entity->dirty($property)) {
+				unset($keys[$i], $data[$property]);
+			}
+		}
+
 		$query = $this->_buildQuery();
-		$statement = $query->insert($this->table(), array_keys($data))
+		$statement = $query->insert($this->table(), $keys)
 			->values($data)
 			->executeStatement();
 
@@ -721,6 +729,7 @@ protected function _processSave($entity, $options) {
 			$primary = $this->primaryKey();
 			$id = $statement->lastInsertId($this->table(), $primary);
 			$entity->set($primary, $id);
+			$entity->clean();
 			$success = $entity;
 		}
 

Cake/Test/TestCase/ORM/TableTest.php

@@ -1238,4 +1238,51 @@ public function testAtomicSaveRollbackOnFailure() {
 		$table->save($data);
 	}
 
+/**
+ * Tests that only the properties marked as dirty are actually saved
+ * to the database
+ *
+ * @return void
+ */
+	public function testSaveOnlyDirtyProperties() {
+		$entity = new \Cake\ORM\Entity([
+			'username' => 'superuser',
+			'password' => 'root',
+			'created' => new \DateTime('2013-10-10 00:00'),
+			'updated' => new \DateTime('2013-10-10 00:00')
+		]);
+		$entity->clean();
+		$entity->dirty('username', true);
+		$entity->dirty('created', true);
+		$entity->dirty('updated', true);
+
+		$table = TableRegistry::get('users');
+		$this->assertSame($entity, $table->save($entity));
+		$this->assertEquals($entity->id, 5);
+
+		$row = $table->find('all')->where(['id' => 5])->first();
+		$entity->set('password', null);
+		$this->assertEquals($entity->toArray(), $row->toArray());
+	}
+
+/**
+ * Tests that a recently saved entity is marked as clean
+ *
+ * @return void
+ */
+	public function testsASavedEntityIsClean() {
+		$entity = new \Cake\ORM\Entity([
+			'username' => 'superuser',
+			'password' => 'root',
+			'created' => new \DateTime('2013-10-10 00:00'),
+			'updated' => new \DateTime('2013-10-10 00:00')
+		]);
+		$table = TableRegistry::get('users');
+		$this->assertSame($entity, $table->save($entity));
+		$this->assertFalse($entity->dirty('usermane'));
+		$this->assertFalse($entity->dirty('password'));
+		$this->assertFalse($entity->dirty('created'));
+		$this->assertFalse($entity->dirty('updated'));
+	}
+
 }