Embed the one rails app into another

Question

I have two apps AppA and AppB which point to same database, but different tables, now I want to embed AppB into AppA, when service of AppA starts up, I could access AppB's page by submenu of AppA.

so what kind of technique I could utilize to do that?

Answer 1

http://railscasts.com/episodes/277-mountable-engines

or

Differences between railties and engines in Ruby On Rails 3

They are helpful.

However, our case looks mostly like this, Combining two Rails applications into one