fix bug

Author: ziaratban

src/ClientSession.php

@@ -138,6 +138,14 @@ public function getHasTransaction(){
         return !empty($this->_transaction);
     }
 
+    /**
+     * Returns whether a multi-document transaction is in progress
+     * @return bool
+    */
+    public function getInTransaction(){
+        return $this->mongoSession->isInTransaction();
+    }
+
     /**
      * End current session
     */

src/Transaction.php

@@ -40,7 +40,7 @@ class Transaction extends \yii\base\BaseObject
      * can [[commit()]] or [[rollBack()]].
      */
     public function getIsActive(){
-        return $this->clientSession->db->getIsActive() && $this->clientSession->GetHasTransaction();
+        return $this->clientSession->db->getIsActive() && $this->clientSession->getInTransaction();
     }
 
     /**
@@ -54,7 +54,7 @@ public function getIsActive(){
     public function start($transactionOptions = []){
         Command::prepareCPOptions($transactionOptions);
         Yii::debug('Starting mongodb transaction ...', __METHOD__);
-        if($this->clientSession->GetHasTransaction())
+        if($this->clientSession->getInTransaction())
             throw new Exception('Nested transaction not supported');
         $this->clientSession->db->trigger(Connection::EVENT_START_TRANSACTION);
         if($this->clientSession->db->enableLogging)