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>'
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