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?

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)

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

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

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)