Hello ! I posted a simple template to show how to add 'act_as_whatever' to ActiveRecord. I think this might be useful to others as there are some trickery ruby things in this file. Here is the template : http://textsnippets.com/posts/show/384 Gaspard B.
on 2006-04-10 15:57
on 2006-04-10 16:39
Any chance of quick guide to how all that works?
on 2006-04-10 17:12
Charlie B. wrote: > Any chance of quick guide to how all that works? The beggining is just to set a namespace : module YourSuperName module Acts module Idiot Then there is a module method that we overwrite. This method is called when the module is included into another object ('base' here as it will be ActiveRecord::Base) : def self.included(base) # add all methods from the module "AddActsAsMethod" to the 'base' module base.extend AddActsAsMethod end So we extend the base object with our 'acts_as_idiot' method. This adds 'acts_as_idiot' to the class methods of ActiveRecord::Base. Then we have the 'acts_as_idiot' method itself : def acts_as_idiot # BELONGS_TO HAS_MANY GOES HERE class_eval <<-END include YourSuperName::Acts::Idiot::InstanceMethods END end This method makes the following lines class Myobj < ActiveRecord::Base acts_as_idiot end behave like class Myobj < ActiveRecord::Base include YourSuperName::Acts::Idiot::InstanceMethods end And the last tricky part : module InstanceMethods def self.included(aClass) aClass.extend ClassMethods end This is executed when the instance methods are added to the class. 'Self' here is the Myobj class, so extending it with aClass.extend moduleName will add the methods in the module to the class instead of the object. The very last line ActiveRecord::Base.send :include, YourSuperName::Acts::Idiot is equivalent to class ActiveRecord::Base include YourSuperName::Acts::Idiot end This effectively includes our code into ActiveRecord, making 'acts_as_idiot' available as a class method. I hope these explanations made it clearer... Gaspard
on 2006-04-11 16:33
Thank you! That's exactly the explanation I was looking for but haven't found anywhere in any tutorials!