未初始化常量 ruby 模型

Question

我有 3 个 classes:
1.文章

class Article < ActiveRecord::Base
  has_many :categories_articles
  has_many :subcategories_articles
  has_many :categories, :through => :categories_articles
  has_many :subcategories, :through => :subcategories_articles
end

2.Category

class Category < ActiveRecord::Base  
  has_many :articles  
  has_many :categories_articles  
  has_many :categories_subcategories  
  has_many :subcategories, :through => :categories_subcategories  
  has_many :articles, :through => :categories_articles  
end

3.The第三个class是前两个的并集，category_article

class CategoryArticle < ActiveRecord::Base  
  belongs_to :category  
  belongs_to :article  
end

所以，当我在视图中调用时

<% f.collection_select(:category_ids, Category.all, :id, :name, {include_blank:"selects"},{class:'form-control select2 multi', :required=>true, multiple: true}) %>

我收到此错误：

uninitialized constant Article::CategoriesArticle

class 子类别和子category_article

也是如此

Answer 1

尝试

has_many :category_articles

和

has_many :subcategory_articles

您还必须更改这些：

has_many :categories, :through => :categories_articles
has_many :subcategories, :through => :subcategories_articles

类似于：

has_many :categories, :through => :category_articles
has_many :subcategories, :through => :subcategory_articles

Rails 不会复数复合 table 名称的两个组成部分。只是最后一个组件。

未初始化常量 ruby 模型

uninitialized constant ruby model

ruby

activerecord

ruby-on-rails

ruby-on-rails-3