So I've inherited a legacy application and I'm trying to work around the edges as I put an admin tool interface on top of the existing code base. I install Devise for user authentication, since I've used it in the past. I change none of the default code. And yet, on successful sign in, I get an error:
Render and/or redirect were called multiple times in this action. Please note that you may only call render OR redirect, and at most once per action. Also note that neither redirect nor render terminate execution of the action, so if you want to exit an action after redirecting, you need to do something like "redirect_to(...) and return". Here's the thing, look where that error was thrown vendor/bundle/ruby/1.9.1/gems/actionpack-3.1.0/lib/action_controller/metal/rendering.rb:15:in `render' vendor/bundle/ruby/1.9.1/gems/actionpack-3.1.0/lib/action_controller/metal/instrumentation.rb:40:in `block (2 levels) in render' vendor/bundle/ruby/1.9.1/gems/activesupport-3.1.0/lib/active_support/core_ext/benchmark.rb:5:in `block in ms' /Users/dmorin/.rvm/rubies/ruby-1.9.3-p0/lib/ruby/1.9.1/benchmark.rb:295:in `realtime' vendor/bundle/ruby/1.9.1/gems/activesupport-3.1.0/lib/active_support/core_ext/benchmark.rb:5:in `ms' vendor/bundle/ruby/1.9.1/gems/actionpack-3.1.0/lib/action_controller/metal/instrumentation.rb:40:in `block in render' vendor/bundle/ruby/1.9.1/gems/actionpack-3.1.0/lib/action_controller/metal/instrumentation.rb:81:in `cleanup_view_runtime' vendor/bundle/ruby/1.9.1/gems/activerecord-3.1.0/lib/active_record/railties/controller_runtime.rb:24:in `cleanup_view_runtime' vendor/bundle/ruby/1.9.1/gems/actionpack-3.1.0/lib/action_controller/metal/instrumentation.rb:39:in `render' app/controllers/application_controller.rb:9:in `status' Look at that last line -- the status method of the application_controller. This is an addition from the legacy code, a simple monitoring method they installed so that the app responds to a "/status" call with the text "UP". I know this to be the problem because if I no longer extend the ApplicationnController and go straight to ActionController::Base instead, thus avoiding that status method, then this error goes away. I'm guessing that the problem goes a little something like this, "Successful login wants to do a redirect, but then control moves on to the status method which tries to do a render, and throws that DoubleRender error." Take out the extra render, and it works. What I can't figure out for the life of me is how Devise is getting there in the first place! The problem is coming from the SessionsController#create method, but this is just the stock version I've done nothing do it: # POST /resource/sign_in def create resource = warden.authenticate!(:scope => resource_name, :recall => "#{controller_path}#new") set_flash_message(:notice, :signed_in) if is_navigational_format? sign_in(resource_name, resource) respond_with resource, :location => after_sign_in_path_for(resource) end This is Devise 2.0.0 on a Rails 3.1 app, Ruby 1.9.2p136. I'm just realizing, as I go googling around, just how new this version of Devise is. I may need to back out a bit. -- Posted via http://www.ruby-forum.com/. -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk@googlegroups.com. To unsubscribe from this group, send email to rubyonrails-talk+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.