Working with modules to group certain methods. Currently I have this set up and it works:
**# app/models/a.rb**
class A has_history end
**# lib/history.rb**
module History module Model def self.included(base) base.send :extend, ClassMethods end
module ClassMethods def has_history(options = {}) send :include, InstanceMethods end end
module InstanceMethods # methods ... end end end
**# config/application.rb**
config.autoload_paths += %W(#{config.root}/lib)
**# config/environment.rb**
ActiveSupport.on_load(:active_record) do include History::Model end
This works, the methods are mixed into the models.
In a similar way, I wanted to package another set of methods with a different purpose in the same application and I followed the same approach:
**# lib/history.rb**
module Fleet module Model def self.included(base) base.extend ClassMethods end
module ClassMethods def has_fleet(options = {}) send :include, InstanceMethods end end
module InstanceMethods # methods ... end end end
**# config/environment.rb**
ActiveSupport.on_load(:active_record) do include History::Model include Fleet::Model end
But, I don't think the module Fleet::Model is loaded and throws up errors when I do this in a model which is supposed to include this module:
**# app/models/b.rb**
class B has_fleet end
I am unable to get around this and not sure what is going wrong here. Throws up the following errors:
syed@rails:~/work/projects/mapunity/pinpoint$ rails c /home/syed/.rvm/gems/ruby-1.9.2-p0/gems/activerecord-3.0.7/lib/ active_record/base.rb:1009:in `method_missing': undefined local variable or method `has_fleet' for #<Class:0x9c2f200> (NameError) from /home/syed/work/projects/mapunity/pinpoint/app/models/ account.rb:2:in `<class:Account>' from /home/syed/work/projects/mapunity/pinpoint/app/models/ account.rb:1:in `<top (required)>' from /home/syed/.rvm/gems/ruby-1.9.2-p0/gems/activesupport-3.0.7/ lib/active_support/dependencies.rb:454:in `load' from /home/syed/.rvm/gems/ruby-1.9.2-p0/gems/activesupport-3.0.7/ lib/active_support/dependencies.rb:454:in `block in load_file' from /home/syed/.rvm/gems/ruby-1.9.2-p0/gems/activesupport-3.0.7/ lib/active_support/dependencies.rb:596:in `new_constants_in' from /home/syed/.rvm/gems/ruby-1.9.2-p0/gems/activesupport-3.0.7/ lib/active_support/dependencies.rb:453:in `load_file' from /home/syed/.rvm/gems/ruby-1.9.2-p0/gems/activesupport-3.0.7/ lib/active_support/dependencies.rb:340:in `require_or_load' from /home/syed/.rvm/gems/ruby-1.9.2-p0/gems/activesupport-3.0.7/ lib/active_support/dependencies.rb:491:in `load_missing_constant' from /home/syed/.rvm/gems/ruby-1.9.2-p0/gems/activesupport-3.0.7/ lib/active_support/dependencies.rb:183:in `block in const_missing' from /home/syed/.rvm/gems/ruby-1.9.2-p0/gems/activesupport-3.0.7/ lib/active_support/dependencies.rb:181:in `each' from /home/syed/.rvm/gems/ruby-1.9.2-p0/gems/activesupport-3.0.7/ lib/active_support/dependencies.rb:181:in `const_missing' from /home/syed/work/projects/mapunity/pinpoint/app/admin/ accounts.rb:1:in `<top (required)>' from /home/syed/.rvm/gems/ruby-1.9.2-p0/gems/activesupport-3.0.7/ lib/active_support/dependencies.rb:235:in `load' from /home/syed/.rvm/gems/ruby-1.9.2-p0/gems/activesupport-3.0.7/ lib/active_support/dependencies.rb:235:in `block in load' from /home/syed/.rvm/gems/ruby-1.9.2-p0/gems/activesupport-3.0.7/ lib/active_support/dependencies.rb:225:in `block in load_dependency' from /home/syed/.rvm/gems/ruby-1.9.2-p0/gems/activesupport-3.0.7/ lib/active_support/dependencies.rb:596:in `new_constants_in' from /home/syed/.rvm/gems/ruby-1.9.2-p0/gems/activesupport-3.0.7/ lib/active_support/dependencies.rb:225:in `load_dependency' from /home/syed/.rvm/gems/ruby-1.9.2-p0/gems/activesupport-3.0.7/ lib/active_support/dependencies.rb:235:in `load' from /home/syed/.rvm/gems/ruby-1.9.2-p0/gems/activeadmin-0.3.2/ lib/active_admin/application.rb:132:in `block in load!' from /home/syed/.rvm/gems/ruby-1.9.2-p0/gems/activeadmin-0.3.2/ lib/active_admin/application.rb:132:in `each' from /home/syed/.rvm/gems/ruby-1.9.2-p0/gems/activeadmin-0.3.2/ lib/active_admin/application.rb:132:in `load!' from /home/syed/.rvm/gems/ruby-1.9.2-p0/gems/activeadmin-0.3.2/ lib/active_admin/application.rb:155:in `routes' from /home/syed/.rvm/gems/ruby-1.9.2-p0/gems/activeadmin-0.3.2/ lib/active_admin.rb:63:in `routes' from /home/syed/work/projects/mapunity/pinpoint/config/routes.rb: 2:in `block in <top (required)>' from /home/syed/.rvm/gems/ruby-1.9.2-p0/gems/actionpack-3.0.7/lib/ action_dispatch/routing/route_set.rb:233:in `instance_exec' from /home/syed/.rvm/gems/ruby-1.9.2-p0/gems/actionpack-3.0.7/lib/ action_dispatch/routing/route_set.rb:233:in `draw' from /home/syed/work/projects/mapunity/pinpoint/config/routes.rb: 1:in `<top (required)>' from /home/syed/.rvm/gems/ruby-1.9.2-p0/gems/activesupport-3.0.7/ lib/active_support/dependencies.rb:235:in `load' from /home/syed/.rvm/gems/ruby-1.9.2-p0/gems/activesupport-3.0.7/ lib/active_support/dependencies.rb:235:in `block in load' from /home/syed/.rvm/gems/ruby-1.9.2-p0/gems/activesupport-3.0.7/ lib/active_support/dependencies.rb:225:in `block in load_dependency' from /home/syed/.rvm/gems/ruby-1.9.2-p0/gems/activesupport-3.0.7/ lib/active_support/dependencies.rb:596:in `new_constants_in' from /home/syed/.rvm/gems/ruby-1.9.2-p0/gems/activesupport-3.0.7/ lib/active_support/dependencies.rb:225:in `load_dependency' from /home/syed/.rvm/gems/ruby-1.9.2-p0/gems/activesupport-3.0.7/ lib/active_support/dependencies.rb:235:in `load' from /home/syed/.rvm/gems/ruby-1.9.2-p0/gems/railties-3.0.7/lib/ rails/application.rb:127:in `block in reload_routes!' from /home/syed/.rvm/gems/ruby-1.9.2-p0/gems/railties-3.0.7/lib/ rails/application.rb:127:in `each' from /home/syed/.rvm/gems/ruby-1.9.2-p0/gems/railties-3.0.7/lib/ rails/application.rb:127:in `reload_routes!' from /home/syed/.rvm/gems/ruby-1.9.2-p0/gems/activeadmin-0.3.2/ lib/active_admin/reloader.rb:17:in `block in attach!' from /home/syed/.rvm/gems/ruby-1.9.2-p0/gems/activesupport-3.0.7/ lib/active_support/callbacks.rb:420:in `_run_prepare_callbacks' from /home/syed/.rvm/gems/ruby-1.9.2-p0/gems/actionpack-3.0.7/lib/ action_dispatch/middleware/callbacks.rb:40:in `initialize' from /home/syed/.rvm/gems/ruby-1.9.2-p0/gems/actionpack-3.0.7/lib/ action_dispatch/middleware/stack.rb:33:in `new' from /home/syed/.rvm/gems/ruby-1.9.2-p0/gems/actionpack-3.0.7/lib/ action_dispatch/middleware/stack.rb:33:in `build' from /home/syed/.rvm/gems/ruby-1.9.2-p0/gems/actionpack-3.0.7/lib/ action_dispatch/middleware/stack.rb:79:in `block in build' from /home/syed/.rvm/gems/ruby-1.9.2-p0/gems/actionpack-3.0.7/lib/ action_dispatch/middleware/stack.rb:79:in `each' from /home/syed/.rvm/gems/ruby-1.9.2-p0/gems/actionpack-3.0.7/lib/ action_dispatch/middleware/stack.rb:79:in `inject' from /home/syed/.rvm/gems/ruby-1.9.2-p0/gems/actionpack-3.0.7/lib/ action_dispatch/middleware/stack.rb:79:in `build' from /home/syed/.rvm/gems/ruby-1.9.2-p0/gems/railties-3.0.7/lib/ rails/application.rb:162:in `app' from /home/syed/.rvm/gems/ruby-1.9.2-p0/gems/railties-3.0.7/lib/ rails/application/finisher.rb:35:in `block in <module:Finisher>' from /home/syed/.rvm/gems/ruby-1.9.2-p0/gems/railties-3.0.7/lib/ rails/initializable.rb:25:in `instance_exec' from /home/syed/.rvm/gems/ruby-1.9.2-p0/gems/railties-3.0.7/lib/ rails/initializable.rb:25:in `run' from /home/syed/.rvm/gems/ruby-1.9.2-p0/gems/railties-3.0.7/lib/ rails/initializable.rb:50:in `block in run_initializers' from /home/syed/.rvm/gems/ruby-1.9.2-p0/gems/railties-3.0.7/lib/ rails/initializable.rb:49:in `each' from /home/syed/.rvm/gems/ruby-1.9.2-p0/gems/railties-3.0.7/lib/ rails/initializable.rb:49:in `run_initializers' from /home/syed/.rvm/gems/ruby-1.9.2-p0/gems/railties-3.0.7/lib/ rails/application.rb:134:in `initialize!' from /home/syed/.rvm/gems/ruby-1.9.2-p0/gems/railties-3.0.7/lib/ rails/application.rb:77:in `method_missing' from /home/syed/work/projects/mapunity/pinpoint/config/ environment.rb:5:in `<top (required)>' from /home/syed/.rvm/gems/ruby-1.9.2-p0/gems/activesupport-3.0.7/ lib/active_support/dependencies.rb:239:in `require' from /home/syed/.rvm/gems/ruby-1.9.2-p0/gems/activesupport-3.0.7/ lib/active_support/dependencies.rb:239:in `block in require' from /home/syed/.rvm/gems/ruby-1.9.2-p0/gems/activesupport-3.0.7/ lib/active_support/dependencies.rb:225:in `block in load_dependency' from /home/syed/.rvm/gems/ruby-1.9.2-p0/gems/activesupport-3.0.7/ lib/active_support/dependencies.rb:596:in `new_constants_in' from /home/syed/.rvm/gems/ruby-1.9.2-p0/gems/activesupport-3.0.7/ lib/active_support/dependencies.rb:225:in `load_dependency' from /home/syed/.rvm/gems/ruby-1.9.2-p0/gems/activesupport-3.0.7/ lib/active_support/dependencies.rb:239:in `require' from /home/syed/.rvm/gems/ruby-1.9.2-p0/gems/railties-3.0.7/lib/ rails/application.rb:103:in `require_environment!' from /home/syed/.rvm/gems/ruby-1.9.2-p0/gems/railties-3.0.7/lib/ rails/commands.rb:22:in `<top (required)>' from script/rails:6:in `require' from script/rails:6:in `<main>'
