Error: uninitialized constant ApplicationController::CanCan about cancan HOT 10 CLOSED

Hi Ryan, I got rid of this error by adding " require 'cancan' " on top of application controler

... sorry for the first answer, problem is plugins are requiring application_controler befor initialization is done ... here is my solution:

  #plugin protection
  is_cancan=true
  begin
    Kernel.const_get('CanCan')
  rescue
    is_cancan=false
  end
  if is_cancan
    rescue_from CanCan::AccessDenied do |exception|
      flash[:error] = 'Access denied.'
      redirect_to root_url
    end
  end

from cancan.

the rest of the system works just fine, including the controllers with cancan. I just cant rake gems:install anymore.

from cancan.

what does the trace say?

from cancan.

rake gems:install --trace
(in /Users/tscolari/Projetos/skeleton)
** Invoke gems:install (first_time)
** Invoke gems:base (first_time)
** Execute gems:base
** Invoke environment (first_time)
** Execute environment
rake aborted!
uninitialized constant ApplicationController::CanCan
/opt/local/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:105:in const_missing' /Users/tscolari/Projetos/skeleton/app/controllers/application_controller.rb:14 /opt/local/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:380:inload_without_new_constant_marking'
/opt/local/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:380:in load_file' /opt/local/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:521:innew_constants_in'
/opt/local/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:379:in load_file' /opt/local/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:259:inrequire_or_load'
/opt/local/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:425:in load_missing_constant' /opt/local/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:80:inconst_missing'
/opt/local/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:92:in const_missing' /Users/tscolari/Projetos/skeleton/app/controllers/administration_controller.rb:1 /opt/local/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:380:inload_without_new_constant_marking'
/opt/local/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:380:in load_file' /opt/local/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:521:innew_constants_in'
/opt/local/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:379:in load_file' /opt/local/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:259:inrequire_or_load'
/opt/local/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:425:in load_missing_constant' /opt/local/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:80:inconst_missing'
/opt/local/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:92:in const_missing' /Users/tscolari/Projetos/skeleton/vendor/plugins/rails-ckeditor/app/controllers/ckeditor_controller.rb:1 /opt/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:ingem_original_require'
/opt/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in require' /opt/local/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:156:inrequire'
/opt/local/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:521:in new_constants_in' /opt/local/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:156:inrequire'
/Users/tscolari/Projetos/skeleton/vendor/plugins/rails-ckeditor/init.rb:17:in evaluate_init_rb' /opt/local/lib/ruby/gems/1.8/gems/rails-2.3.5/lib/rails/plugin.rb:158:inevaluate_init_rb'
/opt/local/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/core_ext/kernel/reporting.rb:11:in silence_warnings' /opt/local/lib/ruby/gems/1.8/gems/rails-2.3.5/lib/rails/plugin.rb:154:inevaluate_init_rb'
/opt/local/lib/ruby/gems/1.8/gems/rails-2.3.5/lib/rails/plugin.rb:48:in load' /opt/local/lib/ruby/gems/1.8/gems/rails-2.3.5/lib/rails/plugin/loader.rb:38:inload_plugins'
/opt/local/lib/ruby/gems/1.8/gems/rails-2.3.5/lib/rails/plugin/loader.rb:37:in each' /opt/local/lib/ruby/gems/1.8/gems/rails-2.3.5/lib/rails/plugin/loader.rb:37:inload_plugins'
/opt/local/lib/ruby/gems/1.8/gems/rails-2.3.5/lib/initializer.rb:369:in load_plugins' /opt/local/lib/ruby/gems/1.8/gems/rails-2.3.5/lib/initializer.rb:165:inprocess'
/opt/local/lib/ruby/gems/1.8/gems/rails-2.3.5/lib/initializer.rb:113:in send' /opt/local/lib/ruby/gems/1.8/gems/rails-2.3.5/lib/initializer.rb:113:inrun'
/Users/tscolari/Projetos/skeleton/config/environment.rb:9
/opt/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in gem_original_require' /opt/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:inrequire'
/opt/local/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:156:in require' /opt/local/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:521:innew_constants_in'
/opt/local/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:156:in require' /opt/local/lib/ruby/gems/1.8/gems/rails-2.3.5/lib/tasks/misc.rake:4 /opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:636:incall'
/opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:636:in execute' /opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:631:ineach'
/opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:631:in execute' /opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:597:ininvoke_with_call_chain'
/opt/local/lib/ruby/1.8/monitor.rb:242:in synchronize' /opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:590:ininvoke_with_call_chain'
/opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:583:in invoke' /opt/local/lib/ruby/gems/1.8/gems/rails-2.3.5/lib/tasks/gems.rake:17 /opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:636:incall'
/opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:636:in execute' /opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:631:ineach'
/opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:631:in execute' /opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:597:ininvoke_with_call_chain'
/opt/local/lib/ruby/1.8/monitor.rb:242:in synchronize' /opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:590:ininvoke_with_call_chain'
/opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:607:in invoke_prerequisites' /opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:604:ineach'
/opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:604:in invoke_prerequisites' /opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:596:ininvoke_with_call_chain'
/opt/local/lib/ruby/1.8/monitor.rb:242:in synchronize' /opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:590:ininvoke_with_call_chain'
/opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:583:in invoke' /opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2051:ininvoke_task'
/opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in top_level' /opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:ineach'
/opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in top_level' /opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2068:instandard_exception_handling'
/opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2023:in top_level' /opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2001:inrun'
/opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2068:in standard_exception_handling' /opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:1998:inrun'
/opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/bin/rake:31
/opt/local/bin/rake:19:in `load'
/opt/local/bin/rake:19

may cancan gem version is cancan (1.0.2)

from cancan.

I'm guessing this is due to the rescue_from clause in your ApplicationController which is getting triggered when you don't have the gem installed. I should probably change the argument to use a string. Thanks for reporting this.

from cancan.

It's best to keep require statements outside of controller/model files, but inside environment config files, initializers, or bundler if you use that. That's the convention anyway.

Placing the CanCan::AccessDenied part in a string in ApplicationController should fix it if I understand the error properly.

from cancan.

I have tested both solutions help and work, of course that one with string is cleaner :)

from cancan.

hey ryanb ,
how to place CanCan::AccessDenied part in a string in ApplicationController

from cancan.

talhait07 just put quotes around it

from cancan.

You have to restart Puma.

from cancan.