如何将会话变量从一个rails 3.2.8引擎传递到另一个引擎?

In our rails 3.2.8 app, there is an mountable engine authentify which handles the authentication of users and generates sessions variable for whole app. When we are integrating authentify with another rails engine rfqx, engine rfqx needs to access the session variable generated by engine authentify. The problem is that session varailable is not available in engine rfqx and is nil. In our rails 3.2.8 app, there is an mountable e