ActiveRecord 3.0.10 how to overwrite initialize from association ?

Hello,

I'm trying to implement the EAV pattern in ActiveRecord, for that case I've create two models: Product and ProductType and based on what ProductType your product is you get dynamically defined accessors. This way you can use the dynamic attributes by all AR methods, like #update_attributes, etc. But you can't directly pass a hash with dynamic attributes to new.

See the code here: product_manager/product.rb at master · edzhelyov/product_manager · GitHub And the corresponding test: product_manager/product_spec.rb at master · edzhelyov/product_manager · GitHub

The test fails with the following:      Failure/Error: product = @pt.products.create :price => 10, :ram => 6.0      ActiveRecord::UnknownAttributeError:        unknown attribute: ram      # ./app/models/product.rb:6:in `initialize'      # ./spec/product_spec.rb:98:in `block (3 levels) in <top (required)>'

This is because the AR#initialize try to call #ram= which is not defined yet, if I first try to define the dynamic attributes I don't have access to the product_type relation, interesting thing is that I can't even access it from the attributes when called with this: `@pt.products.create`

Does anyone have any idea how I can make this pass ?

Thanks, Evgeni