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.

Make the following change....

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

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/