Check if user is active before allowing user to sign in with devise (rails)

Add these two methods to your user model, devise should pick them up automatically – you should NOT need to extend Devise::SessionsController

def active_for_authentication?
  super && self.your_method_for_checking_active # i.e. super && self.is_active
end

def inactive_message
  "Sorry, this account has been deactivated."
end