diff --git a/framework/yii/db/ActiveRecord.php b/framework/yii/db/ActiveRecord.php
index ffae3d8..fce9010 100644
--- a/framework/yii/db/ActiveRecord.php
+++ b/framework/yii/db/ActiveRecord.php
@@ -132,7 +132,7 @@ class ActiveRecord extends Model
 	 *  - an array of name-value pairs: query by a set of column values and return a single record matching all of them.
 	 *  - null: return a new [[ActiveQuery]] object for further query purpose.
 	 *
-	 * @return ActiveQuery|ActiveRecord|null When `$q` is null, a new [[ActiveQuery]] instance
+	 * @return ActiveQuery|ActiveQueryInterface|static|null When `$q` is null, a new [[ActiveQuery]] instance
 	 * is returned; when `$q` is a scalar or an array, an ActiveRecord object matching it will be
 	 * returned (null will be returned if there is no matching).
 	 * @throws InvalidConfigException if the AR class does not have a primary key
@@ -754,7 +754,7 @@ class ActiveRecord extends Model
 	 * [[EVENT_BEFORE_INSERT]], [[EVENT_AFTER_INSERT]] and [[EVENT_AFTER_VALIDATE]]
 	 * will be raised by the corresponding methods.
 	 *
-	 * Only the [[changedAttributes|changed attribute values]] will be inserted into database.
+	 * Only the [[dirtyAttributes|changed attribute values]] will be inserted into database.
 	 *
 	 * If the table's primary key is auto-incremental and is null during insertion,
 	 * it will be populated with the actual value after insertion.
@@ -1179,11 +1179,15 @@ class ActiveRecord extends Model
 	/**
 	 * Returns a value indicating whether the given active record is the same as the current one.
 	 * The comparison is made by comparing the table names and the primary key values of the two active records.
+	 * If one of the records [[isNewRecord|is new]] they are also considered not equal.
 	 * @param ActiveRecord $record record to compare to
 	 * @return boolean whether the two active records refer to the same row in the same database table.
 	 */
 	public function equals($record)
 	{
+		if ($this->isNewRecord || $record->isNewRecord) {
+			return false;
+		}
 		return $this->tableName() === $record->tableName() && $this->getPrimaryKey() === $record->getPrimaryKey();
 	}
 
diff --git a/framework/yii/elasticsearch/ActiveRecord.php b/framework/yii/elasticsearch/ActiveRecord.php
index e46201b..3ea130f 100644
--- a/framework/yii/elasticsearch/ActiveRecord.php
+++ b/framework/yii/elasticsearch/ActiveRecord.php
@@ -25,7 +25,7 @@ use yii\helpers\StringHelper;
  * @author Carsten Brandt <mail@cebe.cc>
  * @since 2.0
  */
-abstract class ActiveRecord extends \yii\db\ActiveRecord
+class ActiveRecord extends \yii\db\ActiveRecord
 {
 	private $_id;
 	private $_version;
@@ -48,7 +48,7 @@ abstract class ActiveRecord extends \yii\db\ActiveRecord
 	{
 		$query = static::createQuery();
 		if (is_array($q)) {
-			if (count($q) == 1 && isset($q['primaryKey'])) {
+			if (count($q) == 1 && (array_key_exists('primaryKey', $q))) {
 				return static::get($q['primaryKey']);
 			}
 			return $query->where($q)->one();
@@ -58,8 +58,23 @@ abstract class ActiveRecord extends \yii\db\ActiveRecord
 		return $query;
 	}
 
+	/**
+	 * Gets a record by its primary key.
+	 *
+	 * @param mixed $primaryKey the primaryKey value
+	 * @param array $options options given in this parameter are passed to elasticsearch
+	 * as request URI parameters.
+	 *
+	 * Please refer to the [elasticsearch documentation](http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/docs-get.html)
+	 * for more details on these options.
+	 * @return static|null The record instance or null if it was not found.
+	 */
+
 	public static function get($primaryKey, $options = [])
 	{
+		if ($primaryKey === null) {
+			return null;
+		}
 		$command = static::getDb()->createCommand();
 		$result = $command->get(static::index(), static::type(), $primaryKey, $options);
 		if ($result['exists']) {
@@ -69,6 +84,34 @@ abstract class ActiveRecord extends \yii\db\ActiveRecord
 	}
 
 	/**
+	 * Gets a list of records by its primary keys.
+	 *
+	 * @param array $primaryKeys an array of primaryKey values
+	 * @param array $options options given in this parameter are passed to elasticsearch
+	 * as request URI parameters.
+	 *
+	 * Please refer to the [elasticsearch documentation](http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/docs-get.html)
+	 * for more details on these options.
+	 * @return static|null The record instance or null if it was not found.
+	 */
+
+	public static function mget($primaryKeys, $options = [])
+	{
+		if (empty($primaryKeys)) {
+			return [];
+		}
+		$command = static::getDb()->createCommand();
+		$result = $command->mget(static::index(), static::type(), $primaryKeys, $options);
+		$models = [];
+		foreach($result['docs'] as $doc) {
+			if ($doc['exists']) {
+				$models[] = static::create($doc);
+			}
+		}
+		return $models;
+	}
+
+	/**
 	 * @inheritDoc
 	 */
 	public static function createQuery()
@@ -117,7 +160,12 @@ abstract class ActiveRecord extends \yii\db\ActiveRecord
 	 */
 	public function getOldPrimaryKey($asArray = false)
 	{
-		return $this->getPrimaryKey($asArray);
+		$id = $this->isNewRecord ? null : $this->_id;
+		if ($asArray) {
+			return ['primaryKey' => $id];
+		} else {
+			return $this->_id;
+		}
 	}
 
 	/**
@@ -142,12 +190,17 @@ abstract class ActiveRecord extends \yii\db\ActiveRecord
 		throw new InvalidConfigException('The attributes() method of elasticsearch ActiveRecord has to be implemented by child classes.');
 	}
 
-	// TODO index and type definition
+	/**
+	 * @return string the name of the index this record is stored in.
+	 */
 	public static function index()
 	{
 		return Inflector::pluralize(Inflector::camel2id(StringHelper::basename(get_called_class()), '-'));
 	}
 
+	/**
+	 * @return string the name of the type of this record.
+	 */
 	public static function type()
 	{
 		return Inflector::camel2id(StringHelper::basename(get_called_class()), '-');
@@ -168,9 +221,56 @@ abstract class ActiveRecord extends \yii\db\ActiveRecord
 	}
 
 	/**
-	 * @inheritDocs
+	 * Inserts a document into the associated index using the attribute values of this record.
+	 *
+	 * This method performs the following steps in order:
+	 *
+	 * 1. call [[beforeValidate()]] when `$runValidation` is true. If validation
+	 *    fails, it will skip the rest of the steps;
+	 * 2. call [[afterValidate()]] when `$runValidation` is true.
+	 * 3. call [[beforeSave()]]. If the method returns false, it will skip the
+	 *    rest of the steps;
+	 * 4. insert the record into database. If this fails, it will skip the rest of the steps;
+	 * 5. call [[afterSave()]];
+	 *
+	 * In the above step 1, 2, 3 and 5, events [[EVENT_BEFORE_VALIDATE]],
+	 * [[EVENT_BEFORE_INSERT]], [[EVENT_AFTER_INSERT]] and [[EVENT_AFTER_VALIDATE]]
+	 * will be raised by the corresponding methods.
+	 *
+	 * Only the [[dirtyAttributes|changed attribute values]] will be inserted into database.
+	 *
+	 * If the [[primaryKey|primary key]] is not set (null) during insertion,
+	 * it will be populated with a
+	 * [randomly generated value](http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/docs-index_.html#_automatic_id_generation)
+	 * after insertion.
+	 *
+	 * For example, to insert a customer record:
+	 *
+	 * ~~~
+	 * $customer = new Customer;
+	 * $customer->name = $name;
+	 * $customer->email = $email;
+	 * $customer->insert();
+	 * ~~~
+	 *
+	 * @param boolean $runValidation whether to perform validation before saving the record.
+	 * If the validation fails, the record will not be inserted into the database.
+	 * @param array $attributes list of attributes that need to be saved. Defaults to null,
+	 * meaning all attributes will be saved.
+	 * @param array $options options given in this parameter are passed to elasticsearch
+	 * as request URI parameters. These are among others:
+	 *
+	 * - `routing` define shard placement of this record.
+	 * - `parent` by giving the primaryKey of another record this defines a parent-child relation
+	 * - `timestamp` specifies the timestamp to store along with the document. Default is indexing time.
+	 *
+	 * Please refer to the [elasticsearch documentation](http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/docs-index_.html)
+	 * for more details on these options.
+	 *
+	 * By default the `op_type` is set to `create`.
+	 * @return boolean whether the attributes are valid and the record is inserted successfully.
 	 */
-	public function insert($runValidation = true, $attributes = null)
+	public function insert($runValidation = true, $attributes = null, $options = ['op_type' => 'create'])
 	{
 		if ($runValidation && !$this->validate($attributes)) {
 			return false;
@@ -182,7 +282,8 @@ abstract class ActiveRecord extends \yii\db\ActiveRecord
 				static::index(),
 				static::type(),
 				$values,
-				$this->getPrimaryKey()
+				$this->getPrimaryKey(),
+				$options
 			);
 
 			if (!$response['ok']) {
@@ -268,7 +369,7 @@ abstract class ActiveRecord extends \yii\db\ActiveRecord
 		}
 		$bulk = '';
 		foreach((array) $condition as $pk) {
-			$bulk = Json::encode([
+			$bulk .= Json::encode([
 				"delete" => [
 					"_id" => $pk,
 					"_type" => static::type(),
@@ -283,10 +384,9 @@ abstract class ActiveRecord extends \yii\db\ActiveRecord
 		$body = Json::decode($response->getBody(true));
 		$n=0;
 		foreach($body['items'] as $item) {
-			if ($item['delete']['ok']) {
+			if ($item['delete']['found'] && $item['delete']['ok']) {
 				$n++;
 			}
-			// TODO might want to update the _version in update()
 		}
 		return $n;
 	}
diff --git a/framework/yii/elasticsearch/Command.php b/framework/yii/elasticsearch/Command.php
index 36bc696..b19d763 100644
--- a/framework/yii/elasticsearch/Command.php
+++ b/framework/yii/elasticsearch/Command.php
@@ -116,6 +116,36 @@ class Command extends Component
 	}
 
 	/**
+	 * gets multiple documents from the index
+	 *
+	 * TODO allow specifying type and index + fields
+	 * @param $index
+	 * @param $type
+	 * @param $id
+	 * @param array $options
+	 * @return mixed
+	 * @see http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/docs-get.html
+	 */
+	public function mget($index, $type, $ids, $options = [])
+	{
+		$httpOptions = [
+			'exceptions' => false,
+		];
+		$body = Json::encode(['ids' => array_values($ids)]);
+		$response = $this->db->http()->post( // TODO guzzle does not manage to send get request with content
+			$this->createUrl([$index, $type, '_mget'], $options),
+			null,
+			$body,
+			$httpOptions
+		)->send();
+		if ($response->getStatusCode() == 200) {
+			return Json::decode($response->getBody(true));
+		} else {
+			throw new Exception('Elasticsearch request failed.');
+		}
+	}
+
+	/**
 	 * gets a documents _source from the index (>=v0.90.1)
 	 * @param $index
 	 * @param $type
diff --git a/tests/unit/framework/db/ActiveRecordTest.php b/tests/unit/framework/db/ActiveRecordTest.php
index 3de40dd..24e5be8 100644
--- a/tests/unit/framework/db/ActiveRecordTest.php
+++ b/tests/unit/framework/db/ActiveRecordTest.php
@@ -104,6 +104,39 @@ class ActiveRecordTest extends DatabaseTestCase
 		$this->assertTrue($customers['3-user3'] instanceof Customer);
 	}
 
+	public function testRefresh()
+	{
+		$customer = new Customer();
+		$this->assertFalse($customer->refresh());
+
+		$customer = Customer::find(1);
+		$customer->name = 'to be refreshed';
+		$this->assertTrue($customer->refresh());
+		$this->assertEquals('user1', $customer->name);
+	}
+
+	public function testEquals()
+	{
+		$customerA = new Customer();
+		$customerB = new Customer();
+		$this->assertFalse($customerA->equals($customerB));
+
+		$customerA = new Customer();
+		$customerB = new Item();
+		$this->assertFalse($customerA->equals($customerB));
+
+		$customerA = Customer::find(1);
+		$customerB = Customer::find(2);
+		$this->assertFalse($customerA->equals($customerB));
+
+		$customerB = Customer::find(1);
+		$this->assertTrue($customerA->equals($customerB));
+
+		$customerA = Customer::find(1);
+		$customerB = Item::find(1);
+		$this->assertFalse($customerA->equals($customerB));
+	}
+
 	public function testFindBySql()
 	{
 		// find one
diff --git a/tests/unit/framework/elasticsearch/ActiveRecordTest.php b/tests/unit/framework/elasticsearch/ActiveRecordTest.php
index 9ac0fdc..c164678 100644
--- a/tests/unit/framework/elasticsearch/ActiveRecordTest.php
+++ b/tests/unit/framework/elasticsearch/ActiveRecordTest.php
@@ -93,17 +93,6 @@ class ActiveRecordTest extends ElasticSearchTestCase
 //		$orderItem->save(false);
 
 		Customer::getDb()->createCommand()->flushIndex();
-
-//		for($n = 0; $n < 20; $n++) {
-//			$r = $db->http()->post('_count')->send();
-//			$c = Json::decode($r->getBody(true));
-//			if ($c['count'] != 11) {
-//				usleep(100000);
-//			} else {
-//				return;
-//			}
-//		}
-//		throw new \Exception('Unable to initialize elasticsearch data.');
 	}
 
 	public function testFind()
@@ -187,6 +176,62 @@ class ActiveRecordTest extends ElasticSearchTestCase
 		$this->assertTrue($customers['2-user3'] instanceof Customer);
 	}
 
+	public function testGet()
+	{
+		$this->assertInstanceOf(Customer::className(), Customer::get(1));
+		$this->assertNull(Customer::get(5));
+	}
+
+	public function testMget()
+	{
+		$this->assertEquals([], Customer::mget([]));
+
+		$records = Customer::mget([1]);
+		$this->assertEquals(1, count($records));
+		$this->assertInstanceOf(Customer::className(), reset($records));
+
+		$records = Customer::mget([5]);
+		$this->assertEquals(0, count($records));
+
+		$records = Customer::mget([1,3,5]);
+		$this->assertEquals(2, count($records));
+		$this->assertInstanceOf(Customer::className(), $records[0]);
+		$this->assertInstanceOf(Customer::className(), $records[1]);
+	}
+
+	public function testRefresh()
+	{
+		$customer = new Customer();
+		$this->assertFalse($customer->refresh());
+
+		$customer = Customer::get(1);
+		$customer->name = 'to be refreshed';
+		$this->assertTrue($customer->refresh());
+		$this->assertEquals('user1', $customer->name);
+	}
+
+	public function testEquals()
+	{
+		$customerA = new Customer();
+		$customerB = new Customer();
+		$this->assertFalse($customerA->equals($customerB));
+
+		$customerA = new Customer();
+		$customerB = new Item();
+		$this->assertFalse($customerA->equals($customerB));
+
+		$customerA = Customer::find(1);
+		$customerB = Customer::find(2);
+		$this->assertFalse($customerA->equals($customerB));
+
+		$customerB = Customer::find(1);
+		$this->assertTrue($customerA->equals($customerB));
+
+		$customerA = Customer::find(1);
+		$customerB = Item::find(1);
+		$this->assertFalse($customerA->equals($customerB));
+	}
+
 	public function testFindCount()
 	{
 		$this->assertEquals(3, Customer::find()->count());
@@ -388,6 +433,8 @@ class ActiveRecordTest extends ElasticSearchTestCase
 
 	public function testInsertNoPk()
 	{
+		$this->assertEquals(['primaryKey'], Customer::primaryKey());
+
 		$customer = new Customer;
 		$customer->email = 'user4@example.com';
 		$customer->name = 'user4';
@@ -435,17 +482,20 @@ class ActiveRecordTest extends ElasticSearchTestCase
 		// updateAll
 		$customer = Customer::find(3);
 		$this->assertEquals('user3', $customer->name);
-		$ret = Customer::updateAll(array(
+		$ret = Customer::updateAll([
 			'name' => 'temp',
-		), array('id' => 3));
+		], ['id' => 3]);
 		$this->assertEquals(1, $ret);
 		$customer = Customer::find(3);
 		$this->assertEquals('temp', $customer->name);
+
+		$ret = Customer::updateAll(['name' => 'temp']);
+		$this->assertEquals(0, $ret);
 	}
 
 	public function testUpdatePk()
 	{
-		$this->setExpectedException('yii\base\NotSupportedException');
+		$this->setExpectedException('yii\base\InvalidCallException');
 
 		$pk = array('primaryKey' => 2);
 		$orderItem = Order::find($pk);
@@ -472,7 +522,13 @@ class ActiveRecordTest extends ElasticSearchTestCase
 		$this->assertEquals(2, count($customers));
 		$ret = Customer::deleteAll([1,2,3]);
 		$this->assertEquals(2, $ret);
+
+		Customer::getDb()->createCommand()->flushIndex('customers');
+
 		$customers = Customer::find()->all();
 		$this->assertEquals(0, count($customers));
+
+		$ret = Customer::deleteAll();
+		$this->assertEquals(0, $ret);
 	}
 }
\ No newline at end of file
diff --git a/tests/unit/framework/redis/ActiveRecordTest.php b/tests/unit/framework/redis/ActiveRecordTest.php
index 31907f7..384ddd9 100644
--- a/tests/unit/framework/redis/ActiveRecordTest.php
+++ b/tests/unit/framework/redis/ActiveRecordTest.php
@@ -161,6 +161,39 @@ class ActiveRecordTest extends RedisTestCase
 		$this->assertTrue($customers['3-user3'] instanceof Customer);
 	}
 
+	public function testRefresh()
+	{
+		$customer = new Customer();
+		$this->assertFalse($customer->refresh());
+
+		$customer = Customer::find(1);
+		$customer->name = 'to be refreshed';
+		$this->assertTrue($customer->refresh());
+		$this->assertEquals('user1', $customer->name);
+	}
+
+	public function testEquals()
+	{
+		$customerA = new Customer();
+		$customerB = new Customer();
+		$this->assertFalse($customerA->equals($customerB));
+
+		$customerA = new Customer();
+		$customerB = new Item();
+		$this->assertFalse($customerA->equals($customerB));
+
+		$customerA = Customer::find(1);
+		$customerB = Customer::find(2);
+		$this->assertFalse($customerA->equals($customerB));
+
+		$customerB = Customer::find(1);
+		$this->assertTrue($customerA->equals($customerB));
+
+		$customerA = Customer::find(1);
+		$customerB = Item::find(1);
+		$this->assertFalse($customerA->equals($customerB));
+	}
+
 	public function testFindCount()
 	{
 		$this->assertEquals(3, Customer::find()->count());