parsley/app/models/ingredient_proxy.rb

class IngredientProxy

  attr_reader :ingredient

  def initialize(food)
    @food = food
  end

  def name
    @food.name
  end

  def density
    @food.density
  end

  def density?
    @food.density.present?
  end

  def get_custom_unit_equivalent(custom_unit_name)
    @food.custom_unit_weight(custom_unit_name)
  end

end