#attributes_for – Provides accessors for associated records.

gistfile1.rb

# Copyright (C) 2009 SemanticGap(R)
#
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module FieldsForModel
  def self.included(base)
    base.extend(ClassMethods)
  end

  module ClassMethods
    def associated_attributes_for(suffix, *attrs)
      attrs.each { |attr|
        class_eval <<-EOT
          def #{attr}_#{suffix}=(hash)
            self.#{attr} = self.build_#{attr} unless self.#{attr}
            self.#{attr}.attributes = hash
            self.#{attr}
          end
  
          def #{attr}_#{suffix}
            self.#{attr} = self.build_#{attr} unless self.#{attr}
            self.#{attr}
          end
        EOT
      }
    end

    def fields_for(*attrs)
      associated_attributes_for("fields", *attrs)
    end

    def attributes_for(*attrs)
      associated_attributes_for("attributes", *attrs)
    end
  end
end