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Scaffold problem
I have experiencing some problems with the usage of scaffold.
I have defined a controller as followings:
class ListItemsController < ApplicationController
scaffold :list_item
end
After that I try to access the webpage but it gives the following errors:
Does anybody experience the same error before? Any idea to get across it?
NoMethodError in List itemsController#index
undefined method `scaffold' for ListItemsController:Class
RAILS_ROOT: /home/user/projects/ShoppingList
Application Trace | Framework Trace | Full Trace
app/controllers/list_items_controller.rb:2
vendor/rails/activesupport/lib/active_support/dependencies.rb:203:in `load_without_new_constant_marking'
vendor/rails/activesupport/lib/active_support/dependencies.rb:203:in `load_file'
vendor/rails/activesupport/lib/active_support/dependencies.rb:342:in `new_constants_in'
vendor/rails/activesupport/lib/active_support/dependencies.rb:202:in `load_file'
vendor/rails/activesupport/lib/active_support/dependencies.rb:94:in `require_or_load'
vendor/rails/activesupport/lib/active_support/dependencies.rb:248:in `load_missing_constant'
vendor/rails/activesupport/lib/active_support/dependencies.rb:453:in `const_missing'
vendor/rails/activesupport/lib/active_support/dependencies.rb:465:in `const_missing'
vendor/rails/activesupport/lib/active_support/inflector.rb:257:in `constantize'
vendor/rails/activesupport/lib/active_support/core_ext/string/inflections.rb:148:in `constantize'
vendor/rails/actionpack/lib/action_controller/routing.rb:1426:in `recognize'
vendor/rails/actionpack/lib/action_controller/dispatcher.rb:170:in `handle_request'
vendor/rails/actionpack/lib/action_controller/dispatcher.rb:115:in `dispatch'
vendor/rails/actionpack/lib/action_controller/dispatcher.rb:126:in `dispatch_cgi'
vendor/rails/actionpack/lib/action_controller/dispatcher.rb:9:in `dispatch'
vendor/rails/railties/lib/webrick_server.rb:112:in `handle_dispatch'
vendor/rails/railties/lib/webrick_server.rb:78:in `service'
/usr/lib/ruby/1.8/webrick/httpserver.rb:104:in `service'
/usr/lib/ruby/1.8/webrick/httpserver.rb:65:in `run'
/usr/lib/ruby/1.8/webrick/server.rb:173:in `start_thread'
/usr/lib/ruby/1.8/webrick/server.rb:162:in `start'
/usr/lib/ruby/1.8/webrick/server.rb:162:in `start_thread'
/usr/lib/ruby/1.8/webrick/server.rb:95:in `start'
/usr/lib/ruby/1.8/webrick/server.rb:92:in `each'
/usr/lib/ruby/1.8/webrick/server.rb:92:in `start'
/usr/lib/ruby/1.8/webrick/server.rb:23:in `start'
/usr/lib/ruby/1.8/webrick/server.rb:82:in `start'
vendor/rails/railties/lib/webrick_server.rb:62:in `dispatch'
vendor/rails/railties/lib/commands/servers/webrick.rb:66
/usr/lib/ruby/1.8/rubygems/custom_require.rb:27:in `gem_original_require'
/usr/lib/ruby/1.8/rubygems/custom_require.rb:27:in `require'
vendor/rails/activesupport/lib/active_support/dependencies.rb:496:in `require'
vendor/rails/activesupport/lib/active_support/dependencies.rb:342:in `new_constants_in'
vendor/rails/activesupport/lib/active_support/dependencies.rb:496:in `require'
vendor/rails/railties/lib/commands/server.rb:39
script/server:3:in `require'
script/server:3
app/controllers/list_items_controller.rb:2
vendor/rails/activesupport/lib/active_support/dependencies.rb:203:in `load_without_new_constant_marking'
vendor/rails/activesupport/lib/active_support/dependencies.rb:203:in `load_file'
vendor/rails/activesupport/lib/active_support/dependencies.rb:342:in `new_constants_in'
vendor/rails/activesupport/lib/active_support/dependencies.rb:202:in `load_file'
vendor/rails/activesupport/lib/active_support/dependencies.rb:94:in `require_or_load'
vendor/rails/activesupport/lib/active_support/dependencies.rb:248:in `load_missing_constant'
vendor/rails/activesupport/lib/active_support/dependencies.rb:453:in `const_missing'
vendor/rails/activesupport/lib/active_support/dependencies.rb:465:in `const_missing'
vendor/rails/activesupport/lib/active_support/inflector.rb:257:in `constantize'
vendor/rails/activesupport/lib/active_support/core_ext/string/inflections.rb:148:in `constantize'
vendor/rails/actionpack/lib/action_controller/routing.rb:1426:in `recognize'
vendor/rails/actionpack/lib/action_controller/dispatcher.rb:170:in `handle_request'
vendor/rails/actionpack/lib/action_controller/dispatcher.rb:115:in `dispatch'
vendor/rails/actionpack/lib/action_controller/dispatcher.rb:126:in `dispatch_cgi'
vendor/rails/actionpack/lib/action_controller/dispatcher.rb:9:in `dispatch'
vendor/rails/railties/lib/webrick_server.rb:112:in `handle_dispatch'
vendor/rails/railties/lib/webrick_server.rb:78:in `service'
/usr/lib/ruby/1.8/webrick/httpserver.rb:104:in `service'
/usr/lib/ruby/1.8/webrick/httpserver.rb:65:in `run'
/usr/lib/ruby/1.8/webrick/server.rb:173:in `start_thread'
/usr/lib/ruby/1.8/webrick/server.rb:162:in `start'
/usr/lib/ruby/1.8/webrick/server.rb:162:in `start_thread'
/usr/lib/ruby/1.8/webrick/server.rb:95:in `start'
/usr/lib/ruby/1.8/webrick/server.rb:92:in `each'
/usr/lib/ruby/1.8/webrick/server.rb:92:in `start'
/usr/lib/ruby/1.8/webrick/server.rb:23:in `start'
/usr/lib/ruby/1.8/webrick/server.rb:82:in `start'
vendor/rails/railties/lib/webrick_server.rb:62:in `dispatch'
vendor/rails/railties/lib/commands/servers/webrick.rb:66
/usr/lib/ruby/1.8/rubygems/custom_require.rb:27:in `gem_original_require'
/usr/lib/ruby/1.8/rubygems/custom_require.rb:27:in `require'
vendor/rails/activesupport/lib/active_support/dependencies.rb:496:in `require'
vendor/rails/activesupport/lib/active_support/dependencies.rb:342:in `new_constants_in'
vendor/rails/activesupport/lib/active_support/dependencies.rb:496:in `require'
vendor/rails/railties/lib/commands/server.rb:39
script/server:3:in `require'
script/server:3
Request
Parameters:
None
Show session dump
---
flash: !map:ActionController::Flash::FlashHash {}
-
Rails 2.0 removed these temporary scaffolds.
You need to run the generator like the following from the command line to actually create the files:
Code:
ruby script/generate scaffold
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To be more precise, remove the controller you've already created with:
Code:
script/destroy controller ListItems
And then use the scaffold generator:
Code:
script/generate scaffold ListItem name:string cost:float quantity:integer
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Basically, you're following old instructions. Dynamic scaffolding (the "scaffold :list_item" bit there) hasn't been valid for quite some time now (it went out with Rails 2.0).
Downside, you have to wipe the old model and recreate it with the scaffold generator. And when you do so, add "--skip-migration" to the scaffold generator line. That way you avoid generating a new migration (assuming, of course, you're rebuilding the model with the same fields).
Unless, that is you want to start from scratch with the model, then after you destroy it you need to walk back the migration that created the fields.
