.js

newChat: function(session,userName,color){
			//gets session's messages as well as user's languages
			return $http.get('/api/session/'+session.id).then(function(response){
				var sessionResp = response.data;
				var languageChosen = chooseUserLanguage($rootScope.currentUser.languages,
														response.data.language);
				

				return socket.emit('joinSession', {
					session: sessionResp,
					user: $rootScope.currentUser.userId,
					language: languageChosen
				}, function(success, err) {
					if (err) {
						console.error('Unable to join session:', err);
						return false;
					} else {
						chats.chatCounter++;
						chats.chatList[session.id] = new Chat(session.id, userName,
																$rootScope.currentUser.userId,
																sessionResp, languageChosen,
																color,chats.chatCounter);

						_.forEach(sessionResp.messages,function(val, key){
							chats.chatList[session.id].displayMessage(val);
						});
						return true;
					}
				});
			});
		},