[DataMapper] Sharing attributes between models

[Paul]

Hi,

I have two models that share some of the same attributes so I wanted to 
setup a single table inheritance structure.  After doing some research, I 
found out that I can use module to achieve the same by doing the following 
instead:

module CommonFields
  def self.included base
    base.class_eval do
      include DataMapper::Resource

      property :type, base::Discriminator
      property :enable_feature1, base::Boolean, :default => false
      property :enable_feature2, base::Boolean, :default => false
    end
  end
end

class A
      include CommonFields

      property: title, String
end

class B
      include CommonFields
end

However, when I do rake db:automigrate I get:

undefined method `properties' for CommonFields:Module
/usr/local/rvm/gems/ruby-1.9.2-p290/gems/dm-core-1.2.0/lib/dm-core/associations/relationship.rb:252:in
 
`parent_key'

Any ideas?

Thanks,

Paul

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