ruby-on-rails - rails : Different Controller behaviour depending on route

Question

我正在寻找解决以下情况的最佳实践:

我有一个“加法”模型，它应该与其他一些模型多对多关联。

例子:

# Meal-Model
has_and_belongs_to_many :additives

# Offer-Model
has_and_belongs_to_many :additives

# Additive-Model
has_and_belongs_to_many :meals
has_and_belongs_to_many :meals

路由以下列方式嵌套:

resources :offers do
  resources :additives
end
resources :meals do
  resources :additives
end

所以我得到这样的网址:

/offers/123/additives
/meals/567/additives

两条路由都导致相同的 Controller 操作，即 additives#index .在 AdditivesController 中，我检查参数是否可用于选择要获取的数据:

class AdditivesController < ApplicationController

before_filter :offermealswitch

# GET /restaurants/1/meals/123/additives
# GET /restaurants/1/offers/123/additives
def index   
  @additives = @additivemeal.additives    
end

def offermealswitch
  if params.has_key?(:meal_id)
    @additivemeal = Meal.find(params[:meal_id])
    @type = "Meal"
  elsif params.has_key?(:offer_id)
    @additivemeal = Offer.find(params[:offer_id])
    @type = "Offer"
  end
end

end

这是处理该问题的正确方法吗？它工作得很好，但我不确定这是 rails 方式......
感谢您的回答!

Answer 1

叹气切换到答案空间，这样我至少可以添加回车符并使代码不愚蠢。

我同意 fl00r 的回答，但要补充的是，您需要这样实例化对象:

@type = params[:type] 
@obj = @type.constantize.find(params["#{type}_id"])
@additives = @obj.additives