From: Rodrigo Pavano <rodrigopavano@...>
Date: 2011-01-25T23:23:06+09:00
Subject: STI with many to many association

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Hello!

Im using ruby 1.9.2 and Rails 3.0.3.

I have the following models

class Property < ActiveRecord::Base

end
--------------------------------------------------------
class Feature < ActiveRecord::Base

end
--------------------------------------------------------
class DefaultFeature < Feature

end
--------------------------------------------------------
class CustomFeature < Feature

end
-------------------------------------------------------
class PropertyFeature < ActiveRecord::Base

end

One Property can have many Features, and one Feature is associated with many
Properties. There are two kinds of Features: DefaultFeatures and
CustomFeatures, for what Im using single table inheritance. Both kinds of
Features have exactly the same fields, but i need to differentiate them in
my application. Im using a different model. Using the model PropertyFeature
is a must because it has fields i need to use.

What i want to achieve, if possible, is being able to access Features from
an Property instance like this:

property = Property.first
property.features
property.custom_features
property.default_features

And also add features to a property:

property << CustomFeature.new

I'd appreciate any help on how to do this (i've tried everything i could
think of), or maybe my approach is wrong to begin with, in which case i'd
love to hear a better way to to this.

thanks!

--
Rodrigo

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