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

[postmodern]

I usually include DataMapper::Resource outside of the class/module eval.

base.send :include, DataMapper::Resource

https://github.com/ronin-ruby/ronin/blob/master/lib/ronin/model/model.rb
https://github.com/ronin-ruby/ronin/blob/master/lib/ronin/model/has_name.rb

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[Paul]

Thanks for the info.  Unfortunately, I tried your suggestion but I still get the same error :(

undefined method 'properties' for CommonFields:Module

I am using datamapper 1.2.0 btw if it makes a difference.

[Paul]

I think I know what the problem is. What I didn't realize was that I had an association in class B that was referencing CommonFields. This is what's causing this problem! Need to rethink how I am going to do this.