ruby-on-rails - Rails Single Table Inheritance with HABTM Fixture in unit testing return NoMethodError: undefined method `singularize'

Question

想象一个模型结构如下：

模型/cross_sell_promotion.rb

     class CrossSellPromotion < Promotion
       has_and_belongs_to_many :afflicted_products, :join_table => :promotion_afflicted_products, :foreign_key => 'promotion_id', :association_foreign_key => 'product_id', :class_name => 'Product'
       has_and_belongs_to_many :afflicted_categories, :join_table => :promotion_afflicted_categories, :foreign_key => 'promotion_id', :association_foreign_key => 'category_id', :class_name => 'Category'
       . . .
     end

模型/促销.rb

class Promotion < ActiveRecord::Base
  has_and_belongs_to_many :products, :join_table => :promotions_products
  has_and_belongs_to_many :categories, :join_table => :promotions_categories
  - - -
end

和表格如下：

table promotions
type :string
...some other fields unrelated to this problem

table promotions_products
promotion_id :integer
product_id :integer

table promotion_afflicted_products
promotion_id :integer
product_id :integer

table promotion_afflicted_categories
promotion_id :integer
category_id :integer

然后我有一个固定装置如下：

#promotions.yml
cross_sell_1:
products: plumeboom_1, plumeboom_2
  value: 100
  value_type: percentage
  type: CrossSellPromotion

#products.yml
plumeboom_1:
  model: plumeboom1
  url: plumeboom-1

plumeboom_2:
  model: plumeboom2
  url: plumeboom-2

plumeboom_3:
  model: plumeboom3
  url: plumeboom-3

当我运行单元测试时，它返回此错误消息：

1) Error:
test_the_truth(CartTest):
NoMethodError: undefined method `singularize' for :promotions_products:Symbol

请让我知道您是否碰巧有类似的经验或知道如何解决此问题，或者至少只是您认为可能有问题的地方，我已准备好尝试任何方法！

非常感谢，请不要犹豫回复...这里真的很绝望！

Answer 1

答案是……你不能！

可悲的是，有时 Rails 不会削减它。在这些情况下，只需为关联表创建另一个 Fixture。

例如，在这种情况下，promotions_products.yml 并在其中输入：

pp1:
    promotion_id: <%= Fixtures.identify(:cross_sell_1) %>
    product_id: <%= Fixtures.identify(:plumeboom_1) %>

我设法在夹具中使用 HABTM 连接，但是当它们也有 STI（单表继承）时，导轨似乎有问题。