Rails Single Table Inheritance with HABTM Fixture in Unit Testing Return NoMethodError: undefined `uniqueize 'method

Question

Present the structure of the model as follows:

models / 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

models /promotion.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

and tables as follows:

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

Then I have the appliances as follows:

#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

When I run my unit test, it returns this error message:

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

Please let me know if you have had a similar experience or if you know how to fix it, or at least what you think might be wrong, I’m ready to try something!

Thank you very much, please feel free to answer ... really desperate here!

Answer 1

: !

, Rails . Fixture .

. promotions_products.yml :

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

HABTM- , STI ( ), , .