ruby-on-rails – Ruby on Rails 5.0中的has_many关系

在我的Rails应用程序中出现问题时,我一直在苦苦挣扎一段时间.我有三个类,Merchandise,MerchandiseCategory和MerchandiseMerchandiseCategory. MerchandiseMerchandiseCategory用于创建其他两个之间的多对多关系.

当我在Rails控制台中运行以下命令时,我得到相应的结果：

m = MerchandiseMerchandiseCategory.first
# Returns an object that relates the first Merchandise
# with the first Merchandise Category

m.merchandise_category
# Returns the corresponding merchandise_category

m.merchandise_category.merchandise_merchandise_categories.first
# Returns an array of all corresponding MerchandiseMerchandiseCategy ids

m.merchandise
# Returns the corresponding merchandise

m.merchandise.merchandise_merchandise_categories.first
# LoadError: Unable to autoload constant
# Merchandise::MerchandiseMerchandiseCategory,expected
# /home/bjarki/Development/h2/app/models/merchandise/merchandise_merchandise_category.rb
# to define it

因此,除了Merchandise和MerchandiseMerchandiseCategory之间的一对多关系外,所有关系都有效.我已经尝试了我能想到的一切,包括删除商品模型并重新创建它.

这些是我正在使用的课程

merchandise.rb

# branch_id: uuid
# name: string
# price: integer
class Merchandise < ApplicationRecord
  has_many :merchandise_merchandise_categories
  has_many :categories,class_name: :MerchandiseCategory,through: :merchandise_merchandise_categories
  belongs_to :branch
end

merchandise_category.rb

# branch_id: uuid
# name : string
class MerchandiseCategory < ApplicationRecord
  has_many :merchandise_merchandise_categories
  has_many :merchandises,through: :merchandise_merchandise_categories
  belongs_to :branch
end

merchandise_merchandise_category.rb

# merchandise_id: uuid
# merchandise_category_id: uuid
class MerchandiseMerchandiseCategory < ApplicationRecord
  belongs_to :merchandise
  belongs_to :merchandise_category
end

这让我在最后的日子里疯狂了.如果有人能指出我正确的方向,我将非常感激.