ruby-on-rails-3 - 计量单位换算 gem

对于我的Rails项目，我正在寻找一个可以转换质量，体积和其他单位的库。

我需要将千克转换成克，将升转换成大汤匙等。

我认为应该看起来像这样：

class Product < ActiveRecord:Base
  acts_as_physical_unit, :volume, :mass, :count
end

class Ingredient < ActiveRecord:Base
  acts_as_physical_unit, :volume, :mass, :count
end

olive_oil = Product.new(:name => "Olive Oil", :volume => "1000 ml")

caesar_salad = Recipe.new(:name => "Caesar salad",
  :ingredients => [
    Ingredient.new(:product => [olive_oil], :volume => "5 tablespoons")
  ]

# In ingredients of "Caesar Salad" are 5 tablespoons of "Olive Oil" specified.
# We should create "Caesar Salad" for 50 persons.
# How mutch bottles of "Olive Oil" should be ordered ?
order = OrderItem.new(
  :product => olive_oil,
  :count => olive_oil.count_for(caesar_salad.ingredients.first)) * 50
)

这样的宝石是否存在？

谢谢。

最佳答案

您可能要尝试ruby-units：

您可以检查unit definitions看看它是否适合您！