ruby on rails - Combining 2 params to create the password when using Devise -

i'm using rails 4 devise , i've got situation need log in password made of 2 separate input fields. after submitting, need combine 2 inputs form password before params used authenticate them.

i know login details correct because if have single password field works expected.

as test i've tried submit blank password , intercept params in sessions controller temporarily hard coding correct password - e.g.

class sessionscontroller < devise::sessionscontroller   def create     params[:user][:password] = "abcde-12345"      [... rest of standard devise sessions controller ... ]   end end  

but doesn't work. happening before hitting controller , pointers on how can intercept submitted parameters appreciated. code devise controller here:

https://github.com/plataformatec/devise/blob/master/app/controllers/devise/sessions_controller.rb

do need write custom warden strategy perhaps?

your test may have failed because authentication may have happened earlier before action processed (or before before_filter callback). example, extension calls current_user in execution chain. after altered params, warden.authenticate! still called strategies aren't performed because they've been performed before (when presumably current_user called), that's how warden things.

so guess leaves 3 options:

1. find authentication performed , alter params accordingly before it
2. implement custom strategy
3. override params_auth_hash method in initializer