# Undefined method \`each' for \*\*\*:Class PROBLEM **URL:** \ **Category:** Rails\ **Created:** [June 26, 2007, 12:42am UTC](https://www.ruby-forum.com/t/undefined-method-each-for-class-problem/107760 "2007-06-26T00:42:56Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![casper\_the\_ghost](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/58956e/32.png) [@casper\_the\_ghost](https://www.ruby-forum.com/u/casper_the_ghost)\ **Post date:** [June 26, 2007, 12:42am UTC](https://www.ruby-forum.com/t/undefined-method-each-for-class-problem/107760/1 "2007-06-26T00:42:56Z")
Hi, i am very new to ROR, this is my 2nd day since i solve the problem of database connection. when i started to write some codes, i got stuck. here is the situation and please give me some help. i have a “posts” table in my database CREATE TABLE `mapapp`.`posts` ( `id` int(11) NOT NULL auto\_increment, `title` varchar(255) default NULL, `body` text, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8; i have an empty “post.rb” in my Models which looks like this: class Post \< ActiveRecord::Base end i wrote an action in my controller which looks like this: def testing @posts = Post for p in @posts render :text =\> p.id end end when i run this action on the browser, it gives me this error message: NoMethodError in PlcController#testing undefined method `each’ for Post:Class RAILS\_ROOT: ./script/…/config/… Application Trace | Framework Trace | Full Trace C:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/active\_record/ base.rb:1235:in `method_missing' #{RAILS_ROOT}/app/controllers/plc_controller.rb:40:in`testing’ C:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/active\_record/ base.rb:1235:in `method_missing' C:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action_controller/ base.rb:1095:in`send’ C:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action\_controller/ base.rb:1095:in `perform_action_without_filters' C:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action_controller/ filters.rb:632:in`call\_filter’ C:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action\_controller/ filters.rb:619:in `perform_action_without_benchmark' C:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action_controller/ benchmarking.rb:66:in`perform\_action\_without\_rescue’ C:/ruby/lib/ruby/1.8/benchmark.rb:293:in `measure' C:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action_controller/ benchmarking.rb:66:in`perform\_action\_without\_rescue’ C:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action\_controller/ rescue.rb:83:in `perform_action' C:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action_controller/ base.rb:430:in`send’ C:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action\_controller/ base.rb:430:in `process_without_filters' C:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action_controller/ filters.rb:624:in`process\_without\_session\_management\_support’ C:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action\_controller/ session\_management.rb:114:in `process' C:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action_controller/ base.rb:330:in`process’ C:/ruby/lib/ruby/gems/1.8/gems/rails-1.2.3/lib/dispatcher.rb:41:in `dispatch' C:/ruby/lib/ruby/gems/1.8/gems/rails-1.2.3/lib/webrick_server.rb: 113:in`handle\_dispatch’ C:/ruby/lib/ruby/gems/1.8/gems/rails-1.2.3/lib/webrick\_server.rb:79:in `service' C:/ruby/lib/ruby/1.8/webrick/httpserver.rb:104:in`service’ C:/ruby/lib/ruby/1.8/webrick/httpserver.rb:65:in `run' C:/ruby/lib/ruby/1.8/webrick/server.rb:173:in`start\_thread’ C:/ruby/lib/ruby/1.8/webrick/server.rb:162:in `start' C:/ruby/lib/ruby/1.8/webrick/server.rb:162:in`start\_thread’ C:/ruby/lib/ruby/1.8/webrick/server.rb:95:in `start' C:/ruby/lib/ruby/1.8/webrick/server.rb:92:in`each’ C:/ruby/lib/ruby/1.8/webrick/server.rb:92:in `start' C:/ruby/lib/ruby/1.8/webrick/server.rb:23:in`start’ C:/ruby/lib/ruby/1.8/webrick/server.rb:82:in `start' C:/ruby/lib/ruby/gems/1.8/gems/rails-1.2.3/lib/webrick_server.rb:63:in`dispatch’ C:/ruby/lib/ruby/gems/1.8/gems/rails-1.2.3/lib/commands/servers/ webrick.rb:59 C:/ruby/lib/ruby/site\_ruby/1.8/rubygems/custom\_require.rb:27:in `gem_original_require' C:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in`require’ C:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/active\_support/ dependencies.rb:495:in `require' C:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/active_support/ dependencies.rb:342:in`new\_constants\_in’ C:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/active\_support/ dependencies.rb:495:in `require' C:/ruby/lib/ruby/gems/1.8/gems/rails-1.2.3/lib/commands/server.rb:39 C:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in`gem\_original\_require’ C:/ruby/lib/ruby/site\_ruby/1.8/rubygems/custom\_require.rb:27:in `require' script/server:3 C:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/active_record/ base.rb:1235:in`method\_missing’ #{RAILS\_ROOT}/app/controllers/plc\_controller.rb:40:in `testing' C:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action_controller/ base.rb:1095:in`send’ C:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action\_controller/ base.rb:1095:in `perform_action_without_filters' C:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action_controller/ filters.rb:632:in`call\_filter’ C:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action\_controller/ filters.rb:619:in `perform_action_without_benchmark' C:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action_controller/ benchmarking.rb:66:in`perform\_action\_without\_rescue’ C:/ruby/lib/ruby/1.8/benchmark.rb:293:in `measure' C:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action_controller/ benchmarking.rb:66:in`perform\_action\_without\_rescue’ C:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action\_controller/ rescue.rb:83:in `perform_action' C:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action_controller/ base.rb:430:in`send’ C:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action\_controller/ base.rb:430:in `process_without_filters' C:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action_controller/ filters.rb:624:in`process\_without\_session\_management\_support’ C:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action\_controller/ session\_management.rb:114:in `process' C:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action_controller/ base.rb:330:in`process’ C:/ruby/lib/ruby/gems/1.8/gems/rails-1.2.3/lib/dispatcher.rb:41:in `dispatch' C:/ruby/lib/ruby/gems/1.8/gems/rails-1.2.3/lib/webrick_server.rb: 113:in`handle\_dispatch’ C:/ruby/lib/ruby/gems/1.8/gems/rails-1.2.3/lib/webrick\_server.rb:79:in `service' C:/ruby/lib/ruby/1.8/webrick/httpserver.rb:104:in`service’ C:/ruby/lib/ruby/1.8/webrick/httpserver.rb:65:in `run' C:/ruby/lib/ruby/1.8/webrick/server.rb:173:in`start\_thread’ C:/ruby/lib/ruby/1.8/webrick/server.rb:162:in `start' C:/ruby/lib/ruby/1.8/webrick/server.rb:162:in`start\_thread’ C:/ruby/lib/ruby/1.8/webrick/server.rb:95:in `start' C:/ruby/lib/ruby/1.8/webrick/server.rb:92:in`each’ C:/ruby/lib/ruby/1.8/webrick/server.rb:92:in `start' C:/ruby/lib/ruby/1.8/webrick/server.rb:23:in`start’ C:/ruby/lib/ruby/1.8/webrick/server.rb:82:in `start' C:/ruby/lib/ruby/gems/1.8/gems/rails-1.2.3/lib/webrick_server.rb:63:in`dispatch’ C:/ruby/lib/ruby/gems/1.8/gems/rails-1.2.3/lib/commands/servers/ webrick.rb:59 C:/ruby/lib/ruby/site\_ruby/1.8/rubygems/custom\_require.rb:27:in `gem_original_require' C:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in`require’ C:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/active\_support/ dependencies.rb:495:in `require' C:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/active_support/ dependencies.rb:342:in`new\_constants\_in’ C:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/active\_support/ dependencies.rb:495:in `require' C:/ruby/lib/ruby/gems/1.8/gems/rails-1.2.3/lib/commands/server.rb:39 C:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in`gem\_original\_require’ C:/ruby/lib/ruby/site\_ruby/1.8/rubygems/custom\_require.rb:27:in `require’ script/server:3 i m very new, so please excuse me if i asked stupid questions. but thanks for you time looking. ---
**Author:** ![casper\_the\_ghost](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/58956e/32.png) [@casper\_the\_ghost](https://www.ruby-forum.com/u/casper_the_ghost)\ **Post date:** [June 26, 2007, 2:34am UTC](https://www.ruby-forum.com/t/undefined-method-each-for-class-problem/107760/2 "2007-06-26T02:34:05Z")
removed\_email\_address@domain.invalid wrote: > undefined method `each’ for Post:Class > Your: ``` for p in @posts ``` is equivalent to: ``` @posts.each do |p| ``` You’ve just set @posts to be equal to the class Post, which doesn’t have an each method. What you probably meant to do is: ``` @posts = Post.find(:all) ``` or some other query to retrieve an array of Posts. Pete Y. > **[Pete Yandell — Principal Engineer / Architect](https://notahat.com/)** > > Pete Yandell is an experienced Principal Software Engineer and Architect based in Melbourne, Australia. ---
**Author:** ![casper\_the\_ghost](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/58956e/32.png) [@casper\_the\_ghost](https://www.ruby-forum.com/u/casper_the_ghost)\ **Post date:** [September 25, 2007, 11:01pm UTC](https://www.ruby-forum.com/t/undefined-method-each-for-class-problem/107760/3 "2007-09-25T23:01:05Z")
Make the following change… def testing @posts = Post.find(:all)