update changelog

docs/changelog.rst

@@ -13,6 +13,7 @@ Development
 - expose `mongoengine.connection.disconnect` and `mongoengine.connection.disconnect_all`
 - Fix disconnect function #566 #1599 #605 #607 #1213 #565
 - Improve connect/disconnect documentations
+- Fix issue when using multiple connections to the same mongo with different credentials #2047
 - POTENTIAL BREAKING CHANGES: (associated with connect/disconnect fixes)
     - calling `connect` 2 times with the same alias and different parameter will raise an error (should call disconnect first)
     - disconnect now clears `mongoengine.connection._connection_settings`

mongoengine/connection.py

@@ -270,9 +270,9 @@ def get_connection(alias=DEFAULT_CONNECTION_NAME, reconnect=False):
     if existing_connection:
         _connections[alias] = existing_connection
     else:
-        _create_connection(alias=alias,
-                           connection_class=connection_class,
-                           **conn_settings)
+        _connections[alias] = _create_connection(alias=alias,
+                                                 connection_class=connection_class,
+                                                 **conn_settings)
 
     return _connections[alias]
 
@@ -283,7 +283,7 @@ def _create_connection(alias, connection_class, **connection_settings):
     MongoEngineConnectionError if it can't be established.
     """
     try:
-        _connections[alias] = connection_class(**connection_settings)
+        return connection_class(**connection_settings)
     except Exception as e:
         raise MongoEngineConnectionError(
             'Cannot connect to database %s :\n%s' % (alias, e))