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James Labocki

2006-Aug-17 12:38 UTC

[Rails] NameError in AdminController#index building scaffold

I''m a pretty big newbie with ROR, but when following a tutorial I 
encounter an ugly error when building a scaffold.  Here is my 
environment

Dev system:
- Windows XP
- java version "1.5.0_06"
- MySQL java version "1.5.0_06"
- Ruby 1.8.4
- Ruby Gems 0.9.0
- Gem install mysql
   Successfully installed mysql-2.7.1-mswin32
   Installing ri documentation for mysql-2.7.1-mswin32...
   Installing RDoc documentation for mysql-2.7.1-mswin32...
- Table in ediweb database
mysql> desc users;
+----------------+-------------+------+-----+---------+----------------+
| Field          | Type        | Null | Key | Default | Extra          |
+----------------+-------------+------+-----+---------+----------------+
| user_id        | int(11)     | NO   | PRI | NULL    | auto_increment |
| user_login     | varchar(50) | NO   |     |         |                |
| user_firstname | varchar(50) | NO   |     |         |                |
| user_lastname  | varchar(50) | NO   |     |         |                |
| user_role      | varchar(50) | NO   |     |         |                |
+----------------+-------------+------+-----+---------+----------------+
5 rows in set (0.18 sec)

I am also connecting to Subversion on a linux system as my Repo.

When I start my server I am able to view several other controllers.  I 
stop my server and create a scaffold in RadRails.

ediweb> ruby script/generate scaffold Users Admin
      exists  app/controllers/
      exists  app/helpers/
      exists  app/views/admin
      exists  test/functional/
  dependency  model
      exists    app/models/
      exists    test/unit/
      exists    test/fixtures/
      create    app/models/users.rb
      create    test/unit/users_test.rb
      create    test/fixtures/users.yml
   identical  app/views/admin/_form.rhtml
      create  app/views/admin/list.rhtml
      create  app/views/admin/show.rhtml
      create  app/views/admin/new.rhtml
      create  app/views/admin/edit.rhtml
      create  app/controllers/admin_controller.rb
      create  test/functional/admin_controller_test.rb
      create  app/helpers/admin_helper.rb
      create  app/views/layouts/admin.rhtml
      create  public/stylesheets/scaffold.css

Looks like no problem, but then I check the page:

 NameError in AdminController#index

uninitialized constant User

RAILS_ROOT: ./script/../config/..
Application Trace | Framework Trace | Full Trace

D:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:123:in
`const_missing''
D:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:131:in
`const_missing''
D:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/inflector.rb:161:in
`constantize''
D:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/core_ext/string/inflections.rb:59:in
`constantize''
D:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/pagination.rb:194:in
`paginator_and_collection_for''
D:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/pagination.rb:129:in
`paginate''
#{RAILS_ROOT}/app/controllers/admin_controller.rb:12:in `list''
#{RAILS_ROOT}/app/controllers/admin_controller.rb:3:in `index''
-e:4

D:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:123:in
`const_missing''
D:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:131:in
`const_missing''
D:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/inflector.rb:161:in
`constantize''
D:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/core_ext/string/inflections.rb:59:in
`constantize''
D:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/pagination.rb:194:in
`paginator_and_collection_for''
D:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/pagination.rb:129:in
`paginate''
D:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/base.rb:941:in
`perform_action_without_filters''
D:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/filters.rb:368:in
`perform_action_without_benchmark''
D:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/benchmarking.rb:69:in
`perform_action_without_rescue''
D:/ruby/lib/ruby/1.8/benchmark.rb:293:in `measure''
D:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/benchmarking.rb:69:in
`perform_action_without_rescue''
D:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/rescue.rb:82:in
`perform_action''
D:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/base.rb:408:in
`process_without_filters''
D:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/filters.rb:377:in
`process_without_session_management_support''
D:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/session_management.rb:117:in
`process''
D:/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/dispatcher.rb:38:in 
`dispatch''
D:/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/webrick_server.rb:115:in 
`handle_dispatch''
D:/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/webrick_server.rb:81:in 
`service''
D:/ruby/lib/ruby/1.8/webrick/httpserver.rb:104:in `service''
D:/ruby/lib/ruby/1.8/webrick/httpserver.rb:65:in `run''
D:/ruby/lib/ruby/1.8/webrick/server.rb:173:in `start_thread''
D:/ruby/lib/ruby/1.8/webrick/server.rb:162:in `start_thread''
D:/ruby/lib/ruby/1.8/webrick/server.rb:95:in `start''
D:/ruby/lib/ruby/1.8/webrick/server.rb:92:in `start''
D:/ruby/lib/ruby/1.8/webrick/server.rb:23:in `start''
D:/ruby/lib/ruby/1.8/webrick/server.rb:82:in `start''
D:/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/webrick_server.rb:67:in 
`dispatch''
D:/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/commands/servers/webrick.rb:59
D:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in 
`require''
D:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:147:in
`require''
D:/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/commands/server.rb:30
D:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in 
`require''
D:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:147:in
`require''
script/server:3

D:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:123:in
`const_missing''
D:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:131:in
`const_missing''
D:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/inflector.rb:161:in
`constantize''
D:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/core_ext/string/inflections.rb:59:in
`constantize''
D:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/pagination.rb:194:in
`paginator_and_collection_for''
D:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/pagination.rb:129:in
`paginate''
#{RAILS_ROOT}/app/controllers/admin_controller.rb:12:in `list''
#{RAILS_ROOT}/app/controllers/admin_controller.rb:3:in `index''
D:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/base.rb:941:in
`perform_action_without_filters''
D:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/filters.rb:368:in
`perform_action_without_benchmark''
D:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/benchmarking.rb:69:in
`perform_action_without_rescue''
D:/ruby/lib/ruby/1.8/benchmark.rb:293:in `measure''
D:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/benchmarking.rb:69:in
`perform_action_without_rescue''
D:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/rescue.rb:82:in
`perform_action''
D:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/base.rb:408:in
`process_without_filters''
D:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/filters.rb:377:in
`process_without_session_management_support''
D:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/session_management.rb:117:in
`process''
D:/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/dispatcher.rb:38:in 
`dispatch''
D:/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/webrick_server.rb:115:in 
`handle_dispatch''
D:/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/webrick_server.rb:81:in 
`service''
D:/ruby/lib/ruby/1.8/webrick/httpserver.rb:104:in `service''
D:/ruby/lib/ruby/1.8/webrick/httpserver.rb:65:in `run''
D:/ruby/lib/ruby/1.8/webrick/server.rb:173:in `start_thread''
D:/ruby/lib/ruby/1.8/webrick/server.rb:162:in `start_thread''
D:/ruby/lib/ruby/1.8/webrick/server.rb:95:in `start''
D:/ruby/lib/ruby/1.8/webrick/server.rb:92:in `start''
D:/ruby/lib/ruby/1.8/webrick/server.rb:23:in `start''
D:/ruby/lib/ruby/1.8/webrick/server.rb:82:in `start''
D:/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/webrick_server.rb:67:in 
`dispatch''
D:/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/commands/servers/webrick.rb:59
D:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in 
`require''
D:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:147:in
`require''
D:/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/commands/server.rb:30
D:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in 
`require''
D:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:147:in
`require''
script/server:3
-e:4

This error occured while loading the following files:
   user.rb

Request

Parameters: None

Show session dump

---
flash: !map:ActionController::Flash::FlashHash {}


Response
Headers: {"cookie"=>[],
"Cache-Control"=>"no-cache"}

I have tried building the scaffold with users and admin instead of Users 
and Admin, but it''s still not working!  Also, I verified MySQL 
connectivity from ruby server to the database by doing the following:


ActiveRecord::Base.connection.select_all(''desc users'')
=> [{"Extra"=>"auto_increment",
"Default"=>nil, "Null"=>"NO",
"Type"=>"int(11)",
"Field"=>"user_id", "Key"=>"PRI"},
{"Extra"=>"",
"Default"=>"", "Null"=>"NO",
"Type"=>"varchar(50)",
"Field"=>"user_login", "Key"=>""},
{"Extra"=>"", "Default"=>"",
"Null"=>"NO",
"Type"=>"varchar(50)",
"Field"=>"user_firstname",
"Key"=>""}, {"Extra"=>"",
"Default"=>"", "Null"=>"NO",
"Type"=>"varchar(50)",
"Field"=>"user_lastname",
"Key"=>""},
{"Extra"=>"", "Default"=>"",
"Null"=>"NO",
"Type"=>"varchar(50)",
"Field"=>"user_role", "Key"=>""}]
>> ActiveRecord::Base.connection.select_all(''select * from
users'')ActiveRecord::Base.connection.select_all(''select * from
users'')
=> []

My question is I do have one record in the table but the ''select
*''
query doesn''t come back with nothing.  Any help would be appreciated!
:)

Thanks
James


-- 
Posted via http://www.ruby-forum.com/.

James Labocki

2006-Aug-17 12:38 UTC

head link

[Rails] Re: NameError in AdminController#index building scaffold

I forgot by database.yml has the following for the dev environment:

development:
  adapter: mysql
  database: ediweb
  username: root
  password: ********
  host: localhost

-- 
Posted via http://www.ruby-forum.com/.

James Labocki

2006-Aug-17 12:46 UTC

head link

[Rails] Re: NameError in AdminController#index building scaffold

One more note, I didn''t have any records in the database!  When I 
inserted some I am still able to connect through the development console 
-- but still gettig the same error from the http://localhost:3000/admin 
--- any ideas?
>> ActiveRecord::Base.connection.select_all(''select* from
users'')ActiveRecord::Base.connection.select_all(''select* from users'')
=> [{"user_login"=>"jsmith",
"user_firstname"=>"joe",
"user_id"=>"1",
"user_role"=>"admin",
"user_lastname"=>"smith"},
{"user_login"=>"bsmith",
"user_firstname"=>"bob",
"user_id"=>"2",
"user_role"=>"user",
"user_lastname"=>"smith"}]


-- 
Posted via http://www.ruby-forum.com/.

James Labocki

2006-Aug-17 12:54 UTC

head link

[Rails] Re: NameError in AdminController#index building scaffold

Also, my model users.rb:

class Users < ActiveRecord::Base
end

-- 
Posted via http://www.ruby-forum.com/.

James Labocki

2006-Aug-17 13:12 UTC

head link

[Rails] Re: NameError in AdminController#index building scaffold

I was able to solve my own problem.  I generated the scaffold using 
''ruby script/generate scaffold user Admin''

ediweb> ruby script/generate scaffold user Admin
      exists  app/controllers/
      exists  app/helpers/
      exists  app/views/admin
      exists  test/functional/
  dependency  model
      exists    app/models/
      exists    test/unit/
      exists    test/fixtures/
      create    app/models/user.rb
      create    test/unit/user_test.rb
      create    test/fixtures/users.yml
      create  app/views/admin/_form.rhtml
      create  app/views/admin/list.rhtml
      create  app/views/admin/show.rhtml
      create  app/views/admin/new.rhtml
      create  app/views/admin/edit.rhtml
      create  app/controllers/admin_controller.rb
      create  test/functional/admin_controller_test.rb
      create  app/helpers/admin_helper.rb
      create  app/views/layouts/admin.rhtml
      create  public/stylesheets/scaffold.css


How did ruby know that my database table was ''users'' when I
generated
the scaffold as ''user''?  I''m sorry if this is a dumb
question :)


-- 
Posted via http://www.ruby-forum.com/.

Rob Gabaree

2006-Aug-17 14:20 UTC

head link

[Rails] Re: NameError in AdminController#index building scaffold

Unless you change it, it always looks for the plural form of the  
model as the table.. so a "person" model would have a
"people" table,
"cat" model would have "cats" table, etc.  This is pretty
basic and
covered in "Agile Web Development in Rails" as well as a lot of  
online tutorials.

On Aug 17, 2006, at 9:11 AM, James Labocki wrote:
> I was able to solve my own problem.  I generated the scaffold using
> ''ruby script/generate scaffold user Admin''
>
> ediweb> ruby script/generate scaffold user Admin
>       exists  app/controllers/
>       exists  app/helpers/
>       exists  app/views/admin
>       exists  test/functional/
>   dependency  model
>       exists    app/models/
>       exists    test/unit/
>       exists    test/fixtures/
>       create    app/models/user.rb
>       create    test/unit/user_test.rb
>       create    test/fixtures/users.yml
>       create  app/views/admin/_form.rhtml
>       create  app/views/admin/list.rhtml
>       create  app/views/admin/show.rhtml
>       create  app/views/admin/new.rhtml
>       create  app/views/admin/edit.rhtml
>       create  app/controllers/admin_controller.rb
>       create  test/functional/admin_controller_test.rb
>       create  app/helpers/admin_helper.rb
>       create  app/views/layouts/admin.rhtml
>       create  public/stylesheets/scaffold.css
>
>
> How did ruby know that my database table was ''users'' when
I generated
> the scaffold as ''user''?  I''m sorry if this is a
dumb question :)
>
>
> -- 
> Posted via http://www.ruby-forum.com/.
> _______________________________________________
> Rails mailing list
> Rails@lists.rubyonrails.org
> http://lists.rubyonrails.org/mailman/listinfo/rails

James Labocki

2006-Aug-18 11:45 UTC

head link

[Rails] Re: Re: NameError in AdminController#index building scaffold

I figured it out -- I had to remove the mysql gem.

gem uninstall mysql

Everything worked after that!

-- 
Posted via http://www.ruby-forum.com/.

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