thr3ads.net - Rails - undefined method `each'' for ***:Class PROBLEM [Jun 2007]

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eryan.yu-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org

2007-Jun-25 17:20 UTC

undefined method `each'' for ***:Class PROBLEM

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.


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jgarvin.lists-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org

2007-Jun-25 17:38 UTC

head link

Re: undefined method `each'' for ***:Class PROBLEM

Make the following change....

def testing
    @posts = Post.find(:all)



On Jun 25, 11:20 am,
"eryan...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org"
<eryan...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:> 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.

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Pete Yandell

2007-Jun-26 00:32 UTC

head link

Re: undefined method `each'' for ***:Class PROBLEM

eryan.yu-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org wrote:
> 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
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 Yandell
http://notahat.com/

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undefined method `each'' for ***:Class PROBLEM

Re: undefined method `each'' for ***:Class PROBLEM

Re: undefined method `each'' for ***:Class PROBLEM

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