Devise is a very popular authentication engine for Rails. It comes packaged as a gem and takes care of a large amount of the boilerplate code you usually need to write around user management/authentication.
Today I was trying to add authentication a Rails engine we mount into our application. The standard code for adding authentication around controller actions is with an before filter.
As far as I can tell this doesn’t work for Rails engines since they use their own ApplicationController.
Luckily devise gives us a very easy way to add authentication at the route level, so just do the following where you are mounting your engine:
The user symbol corresponds to the method I’m calling in the before filter. So if you’re calling authentication_administrator! then you would substitute administrator for user.