How To: Use Recaptcha with Devise

WARNING: The first draft of this page was done by a total n00b. There wasn't any help here for Recaptcha before, so he hopes this does help some people, but other more experienced should clean this up at a later date.

1. Get your keys from Google/Recaptcha
2. Install the Recaptcha gem found here (note: for Rails 3 do gem 'recaptcha', :require => 'recaptcha/rails')
3. Add <%= recaptcha_tags %> on your New Registration view (you must have generated Devise views) the line before your submit button.
4. Create/Update your RegistrationsController to include the following (the first is for a clean Devise install, and the second is for if you use OmniAuth like me): Clean:

  class RegistrationsController < Devise::RegistrationsController
  
    def create
      if verify_recaptcha
        super
      else
        build_resource
        clean_up_passwords(resource)
        flash[:error] = "There was an error with the recaptcha code below. Please re-enter the code and click submit."
        render_with_scope :new
      end
    end
    .
    .
    .
    .
  end

With OmniAuth:

  class RegistrationsController < Devise::RegistrationsController
  
    def create
      if session[:omniauth] == nil #OmniAuth
        if verify_recaptcha
          super
          session[:omniauth] = nil unless @user.new_record? #OmniAuth
        else
          build_resource
          clean_up_passwords(resource)
          flash[:error] = "There was an error with the recaptcha code below. Please re-enter the code and click submit."
          render_with_scope :new
        end
      else
        super
        session[:omniauth] = nil unless @user.new_record? #OmniAuth
      end
    end