NameError in CustomersController#index

rubyonrails-talk
1

I'm new to Rails. I finished the Cookbook tut. no problem. I'm trying to start a project of my own, follow the same instructions but the difference is I created the database myself. After I create the scaffolds and try them out I get this error

NameError in CustomersController#index

uninitialized constant Customer

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

D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/ active_support/dependencies.rb:266:in `load_missing_constant' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/ active_support/dependencies.rb:452:in `const_missing' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/ active_support/dependencies.rb:464:in `const_missing' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/ active_support/inflector.rb:250:in `constantize' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/ active_support/core_ext/string/inflections.rb:148:in `constantize' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/ action_controller/pagination.rb:195:in `paginator_and_collection_for' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/ action_controller/pagination.rb:130:in `paginate' #{RAILS_ROOT}/app/controllers/customers_controller.rb:12:in `list' #{RAILS_ROOT}/app/controllers/customers_controller.rb:3:in `index' -e:4:in `load' -e:4

D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/ active_support/dependencies.rb:266:in `load_missing_constant' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/ active_support/dependencies.rb:452:in `const_missing' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/ active_support/dependencies.rb:464:in `const_missing' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/ active_support/inflector.rb:250:in `constantize' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/ active_support/core_ext/string/inflections.rb:148:in `constantize' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/ action_controller/pagination.rb:195:in `paginator_and_collection_for' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/ action_controller/pagination.rb:130:in `paginate' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/ action_controller/base.rb:1095:in `send' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/ action_controller/base.rb:1095:in `perform_action_without_filters' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/ action_controller/filters.rb:632:in `call_filter' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/ action_controller/filters.rb:634:in `call_filter' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/ action_controller/filters.rb:619:in `perform_action_without_benchmark' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/ action_controller/benchmarking.rb:66:in `perform_action_without_rescue' D:/InstantRails/ruby/lib/ruby/1.8/benchmark.rb:293:in `measure' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/ action_controller/benchmarking.rb:66:in `perform_action_without_rescue' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/ action_controller/rescue.rb:83:in `perform_action' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/ action_controller/base.rb:430:in `send' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/ action_controller/base.rb:430:in `process_without_filters' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/ action_controller/filters.rb:624:in `process_without_session_management_support' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/ action_controller/session_management.rb:114:in `process' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/ action_controller/base.rb:330:in `process' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/rails-1.2.3/lib/ dispatcher.rb:41:in `dispatch' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/ mongrel/rails.rb:78:in `process' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/ mongrel/rails.rb:76:in `synchronize' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/ mongrel/rails.rb:76:in `process' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/ mongrel.rb:618:in `process_client' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/ mongrel.rb:617:in `each' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/ mongrel.rb:617:in `process_client' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/ mongrel.rb:736:in `run' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/ mongrel.rb:736:in `initialize' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/ mongrel.rb:736:in `new' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/ mongrel.rb:736:in `run' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/ mongrel.rb:720:in `initialize' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/ mongrel.rb:720:in `new' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/ mongrel.rb:720:in `run' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/ mongrel/configurator.rb:271:in `run' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/ mongrel/configurator.rb:270:in `each' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/ mongrel/configurator.rb:270:in `run' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/bin/ mongrel_rails:127:in `run' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/ mongrel/command.rb:211:in `run' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/bin/ mongrel_rails:243 D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/ active_support/dependencies.rb:488:in `load' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/ active_support/dependencies.rb:488:in `load' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/ active_support/dependencies.rb:342:in `new_constants_in' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/ active_support/dependencies.rb:488:in `load' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/rails-1.2.3/lib/commands/ servers/mongrel.rb:60 D:/InstantRails/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb: 27:in `gem_original_require' D:/InstantRails/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb: 27:in `require' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/ active_support/dependencies.rb:495:in `require' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/ active_support/dependencies.rb:342:in `new_constants_in' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/ active_support/dependencies.rb:495:in `require' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/rails-1.2.3/lib/commands/ server.rb:39 D:/InstantRails/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb: 27:in `gem_original_require' D:/InstantRails/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb: 27:in `require' script/server:3

D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/ active_support/dependencies.rb:266:in `load_missing_constant' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/ active_support/dependencies.rb:452:in `const_missing' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/ active_support/dependencies.rb:464:in `const_missing' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/ active_support/inflector.rb:250:in `constantize' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/ active_support/core_ext/string/inflections.rb:148:in `constantize' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/ action_controller/pagination.rb:195:in `paginator_and_collection_for' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/ action_controller/pagination.rb:130:in `paginate' #{RAILS_ROOT}/app/controllers/customers_controller.rb:12:in `list' #{RAILS_ROOT}/app/controllers/customers_controller.rb:3:in `index' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/ action_controller/base.rb:1095:in `send' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/ action_controller/base.rb:1095:in `perform_action_without_filters' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/ action_controller/filters.rb:632:in `call_filter' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/ action_controller/filters.rb:634:in `call_filter' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/ action_controller/filters.rb:619:in `perform_action_without_benchmark' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/ action_controller/benchmarking.rb:66:in `perform_action_without_rescue' D:/InstantRails/ruby/lib/ruby/1.8/benchmark.rb:293:in `measure' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/ action_controller/benchmarking.rb:66:in `perform_action_without_rescue' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/ action_controller/rescue.rb:83:in `perform_action' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/ action_controller/base.rb:430:in `send' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/ action_controller/base.rb:430:in `process_without_filters' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/ action_controller/filters.rb:624:in `process_without_session_management_support' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/ action_controller/session_management.rb:114:in `process' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/ action_controller/base.rb:330:in `process' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/rails-1.2.3/lib/ dispatcher.rb:41:in `dispatch' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/ mongrel/rails.rb:78:in `process' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/ mongrel/rails.rb:76:in `synchronize' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/ mongrel/rails.rb:76:in `process' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/ mongrel.rb:618:in `process_client' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/ mongrel.rb:617:in `each' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/ mongrel.rb:617:in `process_client' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/ mongrel.rb:736:in `run' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/ mongrel.rb:736:in `initialize' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/ mongrel.rb:736:in `new' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/ mongrel.rb:736:in `run' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/ mongrel.rb:720:in `initialize' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/ mongrel.rb:720:in `new' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/ mongrel.rb:720:in `run' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/ mongrel/configurator.rb:271:in `run' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/ mongrel/configurator.rb:270:in `each' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/ mongrel/configurator.rb:270:in `run' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/bin/ mongrel_rails:127:in `run' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/ mongrel/command.rb:211:in `run' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/bin/ mongrel_rails:243 D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/ active_support/dependencies.rb:488:in `load' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/ active_support/dependencies.rb:488:in `load' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/ active_support/dependencies.rb:342:in `new_constants_in' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/ active_support/dependencies.rb:488:in `load' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/rails-1.2.3/lib/commands/ servers/mongrel.rb:60 D:/InstantRails/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb: 27:in `gem_original_require' D:/InstantRails/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb: 27:in `require' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/ active_support/dependencies.rb:495:in `require' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/ active_support/dependencies.rb:342:in `new_constants_in' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/ active_support/dependencies.rb:495:in `require' D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/rails-1.2.3/lib/commands/ server.rb:39 D:/InstantRails/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb: 27:in `gem_original_require' D:/InstantRails/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb: 27:in `require' script/server:3 -e:4:in `load' -e:4

Request

Parameters: None

Show session dump

2

It's kind of hard to guess with absolutely no code. Do you have a file in app/models called customer.rb which contains
the definition of the Customer class?

Fred

3

Sorry, Like I said i'm pretty new at this. The files are there but they were empty. I put a "has_many :leases" to the customer.rb. After doing that I restarted my mongrel server and get the same error. All the code in the app is just from running "ruby script\generate customer customer" the the customer database looks like this: create_table "customers", :id => false, :force => true do |t|     t.column "CustID", :integer, :limit => 10, :null => false     t.column "CustFirst", :string, :limit => 20     t.column "CustLast", :string, :limit => 30     t.column "CustCo", :string, :limit => 50     t.column "CustAddr", :string, :limit => 50     t.column "CustCity", :string, :limit => 20     t.column "CustPO", :string, :limit => 7   end

4

Doesn't make sense. There is no "customer" generator.

You should be doing:

   ruby script/generate model customer

which will create several things, including a migration in db/migrate to create the table and a model in app/models/customer.rb (also creates a unit test and test fixture file).

The app/models/customer.rb needs to contain a model class:

  class Customer < ActiveRecord::Base     has_many :leases   end

This declaration assumes a bunch of things:

  * you have a table called "customers"   * you have another table called "leases" with a "customer_id" integer column   * you have a model file called app/models/lease.rb, which declares:

     class Lease < ActiveRecord::Base        belongs_to :customer # not required, but customary      end

If you're starting an app from scratch, use the generators. They ensure that everything is created correctly.

5

Oh, I missed that. So you also need to tell Rails that your id column is non-standard:

  class Customer < ActiveRecord::Base     set_primary_key 'CustID'     ...

  end

6

sorry I missed the generator on that last e-mail. What I typed to generate my app was "ruby script\generate scaffold customers customers" because I created the database first that way it created my controllers & stuff.

I started from scratch again and run "ruby script\generate scaffold customers customers" I run "ruby script/generate model customers" too just in case I needed it. I added to customers.rb: set_primary_key 'CustID' has_many :leases and to leases.rb: belongs_to :customer I still get the same error

7

sorry I missed the generator on that last e-mail. What I typed to generate my app was "ruby script\generate scaffold customers customers" because I created the database first that way it created my controllers & stuff.

I started from scratch again and run "ruby script\generate scaffold customers customers" I run "ruby script/generate model customers" too just in case I needed it. I added to customers.rb: set_primary_key 'CustID' has_many :leases and to leases.rb: belongs_to :customer I still get the same error

It's expecting a customer model (in a customer.rb file), since you've
said belongs_to :customer, but instead you've created a customers
model, in customers.rb

Fred

8

I just missed the 's', in my code is says belongs_to:customers Thanks for the help