I am using mongoid, cancan, devise, rails_admin combination. each of them works individually, however when I set an admin boolean attribute of user, and set various places follow the tutorial, it did not work, here is all the related code snippet: Gemfile ... gem ''rails_admin'', :git => ''git://github.com/sferik/rails_admin.git'' gem ''cancan'' app/models/user.rb class User ... # user.admin? works by setting the following field :admin, type: Boolean, default: false end config/initializers/rails_admin.rb RailsAdmin.config do |config| ... config.authorize_with :cancan ... end app/models/ability.rb class Ability include CanCan::Ability def initialize(user) can :read, :all if user && user.admin? can :access, :rails_admin end end end However when I access the localhost:3000/admin, with a user with its admin attribute set to true, I got this: Started GET "/admin" for 127.0.0.1 at 2012-03-22 19:59:26 -0500 Processing by RailsAdmin::MainController#dashboard as HTML MONGODB (0ms) testapp_development[''users''].find({:_id=>BSON::ObjectId(''4f6932751d4ee83acb000002'')}).limit(-1).sort([[:_id, :asc]]) Completed 500 Internal Server Error in 6ms CanCan::AccessDenied (You are not authorized to access this page.): cancan (1.6.7) lib/cancan/ability.rb:202:in `authorize!'' /home/baboonworksfine/.rvm/gems/ruby-1.9.3-p0@rails320/bundler/gems/rails_admin-7a4fdd931f95/lib/rails_admin/extensions/cancan/authorization_adapter.rb:21:in `authorize'' activesupport (3.2.0) lib/active_support/core_ext/object/try.rb:32:in `try'' (eval):4:in `dashboard'' actionpack (3.2.0) lib/action_controller/metal/implicit_render.rb:4:in `send_action'' actionpack (3.2.0) lib/abstract_controller/base.rb:167:in `process_action'' actionpack (3.2.0) lib/action_controller/metal/rendering.rb:10:in `process_action'' ... ... ... -- 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-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.