• Registered: 2012-12-28
  • Posts: 3

Topic: No Method error

I am new to RoR and following a tutorial given on link
http://net.tutsplus.com/tutorials/other … -on-rails/


NoMethodError in ForumsController#index

undefined method `all' for Forum:Module

but the same all method is working fine for other controllers.

can anybody help?

  • jamesw
  • Administrator
  • Offline
  • From: Leeds, UK
  • Registered: 2008-06-07
  • Posts: 2,701

Re: No Method error

Please post your code and the full stack trace for your error from your development.log file (you'll find that in your_app_root/log folder

What you want and what you need are too often not the same thing!
When your head is hurting from trying to solve a problem, stop standing on it. When you are the right way up you will see the problem differently and you just might find the solution.
(Quote by me 15th July 2009)
  • Registered: 2012-12-28
  • Posts: 3

Re: No Method error

Here is full trace :

app/controllers/forums_controller.rb:3:in `index'
actionpack (3.2.9) lib/action_controller/metal/implicit_render.rb:4:in `send_action'
actionpack (3.2.9) lib/action_controller/metal/implicit_render.rb:4:in `send_action'
actionpack (3.2.9) lib/abstract_controller/base.rb:167:in `process_action'
actionpack (3.2.9) lib/action_controller/metal/rendering.rb:10:in `process_action'
actionpack (3.2.9) lib/abstract_controller/callbacks.rb:18:in `process_action'
activesupport (3.2.9) lib/active_support/callbacks.rb:414:in `_run__773286798__process_action__238790927__callbacks'
activesupport (3.2.9) lib/active_support/callbacks.rb:405:in `send'
activesupport (3.2.9) lib/active_support/callbacks.rb:405:in `__run_callback'
activesupport (3.2.9) lib/active_support/callbacks.rb:385:in `_run_process_action_callbacks'
activesupport (3.2.9) lib/active_support/callbacks.rb:81:in `send'
activesupport (3.2.9) lib/active_support/callbacks.rb:81:in `run_callbacks'
actionpack (3.2.9) lib/abstract_controller/callbacks.rb:17:in `process_action'
actionpack (3.2.9) lib/action_controller/metal/rescue.rb:29:in `process_action'
actionpack (3.2.9) lib/action_controller/metal/instrumentation.rb:30:in `process_action'
activesupport (3.2.9) lib/active_support/notifications.rb:123:in `instrument'
activesupport (3.2.9) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
activesupport (3.2.9) lib/active_support/notifications.rb:123:in `instrument'
actionpack (3.2.9) lib/action_controller/metal/instrumentation.rb:29:in `process_action'
actionpack (3.2.9) lib/action_controller/metal/params_wrapper.rb:207:in `process_action'
activerecord (3.2.9) lib/active_record/railties/controller_runtime.rb:18:in `process_action'
actionpack (3.2.9) lib/abstract_controller/base.rb:121:in `process'
actionpack (3.2.9) lib/abstract_controller/rendering.rb:45:in `process'
actionpack (3.2.9) lib/action_controller/metal.rb:203:in `dispatch'
actionpack (3.2.9) lib/action_controller/metal/rack_delegation.rb:14:in `dispatch'
actionpack (3.2.9) lib/action_controller/metal.rb:246:in `action'
actionpack (3.2.9) lib/action_dispatch/routing/route_set.rb:73:in `call'
actionpack (3.2.9) lib/action_dispatch/routing/route_set.rb:73:in `dispatch'
actionpack (3.2.9) lib/action_dispatch/routing/route_set.rb:36:in `call'
journey (1.0.4) lib/journey/router.rb:68:in `call'
journey (1.0.4) lib/journey/router.rb:56:in `each'
journey (1.0.4) lib/journey/router.rb:56:in `call'
actionpack (3.2.9) lib/action_dispatch/routing/route_set.rb:601:in `call'
actionpack (3.2.9) lib/action_dispatch/middleware/best_standards_support.rb:17:in `call'
rack (1.4.1) lib/rack/etag.rb:23:in `call'
rack (1.4.1) lib/rack/conditionalget.rb:25:in `call'
actionpack (3.2.9) lib/action_dispatch/middleware/head.rb:14:in `call'
actionpack (3.2.9) lib/action_dispatch/middleware/params_parser.rb:21:in `call'
actionpack (3.2.9) lib/action_dispatch/middleware/flash.rb:242:in `call'
rack (1.4.1) lib/rack/session/abstract/id.rb:205:in `context'
rack (1.4.1) lib/rack/session/abstract/id.rb:200:in `call'
actionpack (3.2.9) lib/action_dispatch/middleware/cookies.rb:341:in `call'
activerecord (3.2.9) lib/active_record/query_cache.rb:64:in `call'
activerecord (3.2.9) lib/active_record/connection_adapters/abstract/connection_pool.rb:479:in `call'
actionpack (3.2.9) lib/action_dispatch/middleware/callbacks.rb:28:in `call'
activesupport (3.2.9) lib/active_support/callbacks.rb:405:in `_run__809978821__call__4__callbacks'
activesupport (3.2.9) lib/active_support/callbacks.rb:405:in `send'
activesupport (3.2.9) lib/active_support/callbacks.rb:405:in `__run_callback'
activesupport (3.2.9) lib/active_support/callbacks.rb:385:in `_run_call_callbacks'
activesupport (3.2.9) lib/active_support/callbacks.rb:81:in `send'
activesupport (3.2.9) lib/active_support/callbacks.rb:81:in `run_callbacks'
actionpack (3.2.9) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
actionpack (3.2.9) lib/action_dispatch/middleware/reloader.rb:65:in `call'
actionpack (3.2.9) lib/action_dispatch/middleware/remote_ip.rb:31:in `call'
actionpack (3.2.9) lib/action_dispatch/middleware/debug_exceptions.rb:16:in `call'
actionpack (3.2.9) lib/action_dispatch/middleware/show_exceptions.rb:56:in `call'
railties (3.2.9) lib/rails/rack/logger.rb:32:in `call_app'
railties (3.2.9) lib/rails/rack/logger.rb:16:in `call'
activesupport (3.2.9) lib/active_support/tagged_logging.rb:22:in `tagged'
railties (3.2.9) lib/rails/rack/logger.rb:16:in `call'
actionpack (3.2.9) lib/action_dispatch/middleware/request_id.rb:22:in `call'
rack (1.4.1) lib/rack/methodoverride.rb:21:in `call'
rack (1.4.1) lib/rack/runtime.rb:17:in `call'
activesupport (3.2.9) lib/active_support/cache/strategy/local_cache.rb:72:in `call'
rack (1.4.1) lib/rack/lock.rb:15:in `call'
actionpack (3.2.9) lib/action_dispatch/middleware/static.rb:62:in `call'
railties (3.2.9) lib/rails/engine.rb:479:in `call'
railties (3.2.9) lib/rails/application.rb:223:in `call'
railties (3.2.9) lib/rails/railtie/configurable.rb:30:in `send'
railties (3.2.9) lib/rails/railtie/configurable.rb:30:in `method_missing'
passenger (3.0.18) lib/phusion_passenger/rack/request_handler.rb:96:in `process_request'
passenger (3.0.18) lib/phusion_passenger/abstract_request_handler.rb:516:in `accept_and_process_next_request'
passenger (3.0.18) lib/phusion_passenger/abstract_request_handler.rb:274:in `main_loop'
passenger (3.0.18) lib/phusion_passenger/rack/application_spawner.rb:206:in `start_request_handler'
passenger (3.0.18) lib/phusion_passenger/rack/application_spawner.rb:171:in `send'
passenger (3.0.18) lib/phusion_passenger/rack/application_spawner.rb:171:in `handle_spawn_application'
passenger (3.0.18) lib/phusion_passenger/utils.rb:470:in `safe_fork'
passenger (3.0.18) lib/phusion_passenger/rack/application_spawner.rb:166:in `handle_spawn_application'
passenger (3.0.18) lib/phusion_passenger/abstract_server.rb:357:in `__send__'
passenger (3.0.18) lib/phusion_passenger/abstract_server.rb:357:in `server_main_loop'
passenger (3.0.18) lib/phusion_passenger/abstract_server.rb:206:in `start_synchronously'
passenger (3.0.18) lib/phusion_passenger/abstract_server.rb:180:in `start'
passenger (3.0.18) lib/phusion_passenger/rack/application_spawner.rb:129:in `start'
passenger (3.0.18) lib/phusion_passenger/spawn_manager.rb:253:in `spawn_rack_application'
passenger (3.0.18) lib/phusion_passenger/abstract_server_collection.rb:132:in `lookup_or_add'
passenger (3.0.18) lib/phusion_passenger/spawn_manager.rb:246:in `spawn_rack_application'
passenger (3.0.18) lib/phusion_passenger/abstract_server_collection.rb:82:in `synchronize'
passenger (3.0.18) lib/phusion_passenger/abstract_server_collection.rb:79:in `synchronize'
passenger (3.0.18) lib/phusion_passenger/spawn_manager.rb:244:in `spawn_rack_application'
passenger (3.0.18) lib/phusion_passenger/spawn_manager.rb:137:in `spawn_application'
passenger (3.0.18) lib/phusion_passenger/spawn_manager.rb:275:in `handle_spawn_application'
passenger (3.0.18) lib/phusion_passenger/abstract_server.rb:357:in `__send__'
passenger (3.0.18) lib/phusion_passenger/abstract_server.rb:357:in `server_main_loop'
passenger (3.0.18) lib/phusion_passenger/abstract_server.rb:206:in `start_synchronously'
passenger (3.0.18) helper-scripts/passenger-spawn-server:99

  • Registered: 2012-12-28
  • Posts: 3

Re: No Method error

in log file i found


Started GET "/" for 127.0.0.1 at Mon Dec 31 11:02:32 +0530 2012
Processing by ForumsController#index as HTML
Completed 500 Internal Server Error in 0ms

NoMethodError (undefined method `all' for Forum:Module):
  app/controllers/forums_controller.rb:3:in `index'


  Rendered /var/lib/gems/1.8/gems/actionpack-3.2.9/lib/action_dispatch/middleware/templates/rescues/_trace.erb (1.4ms)
  Rendered /var/lib/gems/1.8/gems/actionpack-3.2.9/lib/action_dispatch/middleware/templates/rescues/_request_and_response.erb (1.1ms)
  Rendered /var/lib/gems/1.8/gems/actionpack-3.2.9/lib/action_dispatch/middleware/templates/rescues/diagnostics.erb within rescues/layout (7.5ms)




and my controller forums_controller.rb have the following code

class ForumsController < ApplicationController
  def index
    @forums = Forum.all
  end

  def show
    @forum = Forum.find(params[:id])
  end

  def new
    @forum = Forum.new
  end

  def create
    @forum = Forum.new(params[:forum])
    if @forum.save
      redirect_to @forum, :notice => "Successfully created forum."
    else
      render :action => 'new'
    end
  end

  def edit
    @forum = Forum.find(params[:id])
  end

  def update
    @forum = Forum.find(params[:id])
    if @forum.update_attributes(params[:forum])
      redirect_to @forum, :notice  => "Successfully updated forum."
    else
      render :action => 'edit'
    end
  end

  def destroy
    @forum = Forum.find(params[:id])
    @forum.destroy
    redirect_to forums_url, :notice => "Successfully destroyed forum."
  end
end

  • jamesw
  • Administrator
  • Offline
  • From: Leeds, UK
  • Registered: 2008-06-07
  • Posts: 2,701

Re: No Method error

So the line @forums = Forum.all is the cause of the error. Rails thinks that the class Forum is a module rather than a model, why would that be?

What you want and what you need are too often not the same thing!
When your head is hurting from trying to solve a problem, stop standing on it. When you are the right way up you will see the problem differently and you just might find the solution.
(Quote by me 15th July 2009)