如何从Rails中的模型中获取关联模型的属性

Question

I want to essentially make an alias of an attribute in a related model within the first model. Here are my models:

class Ingredient < ActiveRecord::Base
    belongs_to :tag
end

class Tag < ActiveRecord::Base
    has_many :ingredients
end

The tags table has a column called "name." I want to be able to call ingredient.name to get ingredient.tag.name. I tried creating getter/setter methods for "name" in Ingredient but I'm not sure how to fetch the "name" attribute of Tag.

Answer 1

class Ingredient < ActiveRecord::Base
    belongs_to :tag

    def name
      tag.name
    end
end

Answer 2

A one-liner equal to Abdullah's answer would be to delegate :

delegate :name, :to => :tag

If you care about making things all on one line.