Question

我有3个班：
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.第三类是前两个的联合，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

类Subcategory和subcategory_article

也是如此

Answer 1

尝试

has_many :category_articles

和

has_many :subcategory_articles

你还必须改变这些：

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不会复合组合表名称的两个组件。只是最后一个组成部分。

未初始化的恒定红宝石模型

1 个答案: