model_feature.rb

# This is designed to be used in cell classes but will work with any class
# which has a 'model' method.
#
#  Example:
#
#  class UserCell < Cell::ViewModel
#    extend ModelFeature
#
#    model_feature :name
#  end
#
# This will create an instance method 'name' which will check
# if the model responds to :[] and can access attributes
# like a hash model[:name] or falls back to model.name.
module ModelFeature
  def model_feature(name)
    begin
      mod = const_get(:Features)
    rescue NameError
      mod = Module.new
      const_set(:Features, mod)
      include mod
    end
    
    mod.send(:define_method, name) do
      if model.respond_to?(:[]) && !model.is_a?(Array)
        model[name]
      else
        model.__send__(name)
      end
    end
  end
end