script/generate scaffold user

rubyonrails-talk
1

NameError in UsersController#index

uninitialized constant UsersController::User

RAILS_ROOT: C:/RailsApps/rgams Application Trace | Framework Trace | Full Trace

c:/ruby/lib/ruby/gems/1.8/gems/activesupport-2.1.0/lib/active_support/dependencies.rb:492:in `const_missing' app/controllers/users_controller.rb:5:in `index'

c:/ruby/lib/ruby/gems/1.8/gems/activesupport-2.1.0/lib/active_support/dependencies.rb:492:in `const_missing' c:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/base.rb:1162:in `send' c:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/base.rb:1162:in `perform_action_without_filters' c:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/filters.rb:580:in `call_filters' c:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/filters.rb:573:in `perform_action_without_benchmark' c:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/benchmarking.rb:68: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-2.1.0/lib/action_controller/benchmarking.rb:68:in `perform_action_without_rescue' c:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/rescue.rb:201:in `perform_action_without_caching' c:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/caching/sql_cache.rb:13:in `perform_action' c:/ruby/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/connection_adapters/abstract/query_cache.rb:33:in `cache' c:/ruby/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/query_cache.rb:8:in `cache' c:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/caching/sql_cache.rb:12:in `perform_action' c:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/base.rb:529:in `send' c:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/base.rb:529:in `process_without_filters' c:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/filters.rb:569:in `process_without_session_management_support' c:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/session_management.rb:130:in `process' c:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/base.rb:389:in `process' c:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/dispatcher.rb:149:in `handle_request' c:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/dispatcher.rb:107:in `dispatch' c:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/dispatcher.rb:104:in `synchronize' c:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/dispatcher.rb:104:in `dispatch' c:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/dispatcher.rb:120:in `dispatch_cgi' c:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/dispatcher.rb:35:in `dispatch' c:/ruby/lib/ruby/gems/1.8/gems/rails-2.1.0/lib/webrick_server.rb:112:in `handle_dispatch' c:/ruby/lib/ruby/gems/1.8/gems/rails-2.1.0/lib/webrick_server.rb:78: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-2.1.0/lib/webrick_server.rb:62:in `dispatch' c:/ruby/lib/ruby/gems/1.8/gems/rails-2.1.0/lib/commands/servers/webrick.rb:66 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-2.1.0/lib/active_support/dependencies.rb:509:in `require' c:/ruby/lib/ruby/gems/1.8/gems/activesupport-2.1.0/lib/active_support/dependencies.rb:354:in `new_constants_in' c:/ruby/lib/ruby/gems/1.8/gems/activesupport-2.1.0/lib/active_support/dependencies.rb:509:in `require' c:/ruby/lib/ruby/gems/1.8/gems/rails-2.1.0/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/activesupport-2.1.0/lib/active_support/dependencies.rb:492:in `const_missing' app/controllers/users_controller.rb:5:in `index' c:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/base.rb:1162:in `send' c:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/base.rb:1162:in `perform_action_without_filters' c:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/filters.rb:580:in `call_filters' c:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/filters.rb:573:in `perform_action_without_benchmark' c:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/benchmarking.rb:68: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-2.1.0/lib/action_controller/benchmarking.rb:68:in `perform_action_without_rescue' c:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/rescue.rb:201:in `perform_action_without_caching' c:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/caching/sql_cache.rb:13:in `perform_action' c:/ruby/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/connection_adapters/abstract/query_cache.rb:33:in `cache' c:/ruby/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/query_cache.rb:8:in `cache' c:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/caching/sql_cache.rb:12:in `perform_action' c:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/base.rb:529:in `send' c:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/base.rb:529:in `process_without_filters' c:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/filters.rb:569:in `process_without_session_management_support' c:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/session_management.rb:130:in `process' c:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/base.rb:389:in `process' c:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/dispatcher.rb:149:in `handle_request' c:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/dispatcher.rb:107:in `dispatch' c:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/dispatcher.rb:104:in `synchronize' c:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/dispatcher.rb:104:in `dispatch' c:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/dispatcher.rb:120:in `dispatch_cgi' c:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/dispatcher.rb:35:in `dispatch' c:/ruby/lib/ruby/gems/1.8/gems/rails-2.1.0/lib/webrick_server.rb:112:in `handle_dispatch' c:/ruby/lib/ruby/gems/1.8/gems/rails-2.1.0/lib/webrick_server.rb:78: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-2.1.0/lib/webrick_server.rb:62:in `dispatch' c:/ruby/lib/ruby/gems/1.8/gems/rails-2.1.0/lib/commands/servers/webrick.rb:66 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-2.1.0/lib/active_support/dependencies.rb:509:in `require' c:/ruby/lib/ruby/gems/1.8/gems/activesupport-2.1.0/lib/active_support/dependencies.rb:354:in `new_constants_in' c:/ruby/lib/ruby/gems/1.8/gems/activesupport-2.1.0/lib/active_support/dependencies.rb:509:in `require' c:/ruby/lib/ruby/gems/1.8/gems/rails-2.1.0/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

Request

Parameters:

None

Show session dump

2

could you put the ocntroller code plz?

3

...Or just see if you even have a User class somewhere. Do you perhaps not have app/models/user.rb?

-Rob

Rob Biedenharn http://agileconsultingllc.com Rob@AgileConsultingLLC.com

4

Where is that located?

Thanks

5

Mmm.. I'm trying to follow http://media.rubyonrails.org/video/rails_take2_with_sound.mov, the rails video, and I created my model called User,

in the HomeController#index file I have

scaffold :User

And I get this error when I reload the page:

NoMethodError in HomeController#index

undefined method `scaffold' for HomeController:Class

Thanks for the help

6

You need to either use an old version of Rails (say, 1.2.6) for that tutorial or find a tutorial that is based on Rails 2.x

The dynamic scaffold as used in that old tutorial is no longer available. You can use the new static scaffold generator to get started:

   script/generate scaffold

Read the help message that it provides, and then give it the arguments that you need (and perhaps you can still follow most of the old tutorial).

-Rob

Rob Biedenharn http://agileconsultingllc.com Rob@AgileConsultingLLC.com

7

Whenever I use script/generate scaffold, I get this error

for script/generate scaffold Requirement:

[http://localhost:3000/requirement\] Routing Error

No route matches "/requirement" with {:method=>:get}

Thanks for the help.

8

Whenever I use script/generate scaffold, I get this error

for script/generate scaffold Requirement:

[http://localhost:3000/requirement\] Routing Error

No route matches "/requirement" with {:method=>:get}

Thanks for the help.

When I run that (against a Rails 2.0.2 project):

$ script/generate scaffold Usage: script/generate scaffold ModelName [field:type, field:type]

Options:          --skip-timestamps Don't add timestamps to the migration file for this model          --skip-migration Don't generate a migration file for this model

Rails Info:      -v, --version Show the Rails version number and quit.      -h, --help Show this help message and quit.

General Options:      -p, --pretend Run but do not make any changes.      -f, --force Overwrite files that already exist.      -s, --skip Skip files that already exist.      -q, --quiet Suppress normal output.      -t, --backtrace Debugging: show backtrace on errors.      -c, --svn Modify files with subversion. (Note: svn must be in path)

Description:      Scaffolds an entire resource, from model and migration to controller and      views, along with a full test suite. The resource is ready to use as a      starting point for your restful, resource-oriented application.

     Pass the name of the model, either CamelCased or under_scored, as the first      argument, and an optional list of attribute pairs.

     Attribute pairs are column_name:sql_type arguments specifying the      model's attributes. Timestamps are added by default, so you don't have to      specify them by hand as 'created_at:datetime updated_at:datetime'.

     You don't have to think up every attribute up front, but it helps to      sketch out a few so you can start working with the resource immediately.

     For example, `scaffold post title:string body:text published:boolean`      gives you a model with those three attributes, a controller that handles      the create/show/update/destroy, forms to create and edit your posts, and      an index that lists them all, as well as a map.resources :posts      declaration in config/routes.rb.

Examples:      `./script/generate scaffold post` # no attributes, view will be anemic      `./script/generate scaffold post title:string body:text published:boolean`      `./script/generate scaffold purchase order_id:integer amount:decimal` ------------------->8------->8------->8------->8------->8------- >8------->8---

So you need to run the script/generate with the arguments that you want (and probably restart your server so the new routes can be parsed) and then continue with the tutorial.

-Rob

Rob Biedenharn http://agileconsultingllc.com Rob@AgileConsultingLLC.com

9

I have a database rgams_dev with table users

users: user_email_id | varchar(100) user_password | varchar(100)

I typed:

C:\RailsApps\rgams\script\generate scaffold User [user_email_id:varchar, user_password:varchar]

There's no problem creating the corresponding files and what not, but I still get the error:

Routing Error

No route matches "/user" with {:method=>:get}

10

You’re doin it wrong.

C:\RailsApps\rgams\script\

generate scaffold User [user_email_id:varchar,

user_password:varchar]

Rails has its own way of defining tables. Most of the tutorials out there are terriblly out of date. You’re trying to use sql stuff when creating your tablle, That’s causing the generators to freak out and not build what you need.

You want to do this:

c: cd\RailsApps\rgams ruby script\generate scaffold user email:string password:string

This generates a migration to build the table. The primary key , though not specified, will be created for you and it will be called “id”. In the example you provided, your field names were prefixed with user_ which is not necessary (or good practice) in Rails. Finally, I assume you want to store their email address, not email_id… Rails, by default, thinks _id means a key to another table (a foreign key, but there’s not Foreign Key Constraint.

Really, you should just buy http://pragprog.com/titles/rails3/agile-web-development-with-rails-third-edition in PDF and learn how this all actually works. It can be very frustrating learning Rails off the web.

11

Thanks Brian, I am going to purchase the pdf... I managed to figure a few things out, but when I go to create a new user at

http://localhost:3000/users

this error pops up when i click create:

ActiveRecord::StatementInvalid in UsersController#show

Mysql::Error: Unknown column 'users.id' in 'where clause': SELECT * FROM `users` WHERE (`users`.`id` = '0')

This is in users_controller.rb:

  def show     @user = User.find(params[:id])

    respond_to do |format|       format.html # show.html.erb       format.xml { render :xml => @user }     end   end

In the mysql database, I see the added user, so it added fine.

Thanks

12

I would've thought by now that that tutorial would've been replaced to stop stuff like this from happening.