Question

允许用户为他/她创建的产品分配类别的最佳方法是什么？现在我通过中间分类模型连接了产品和类别模型。

product.rb

class Product < ActiveRecord::Base
  attr_accessible :description, :name

  has_many :categorizations
  has_many :categories, :through => :categorizations
end

category.rb

class Category < ActiveRecord::Base
  attr_accessible :name

  has_many :categorizations
  has_many :products, :through => :categorizations
end

categorization.rb

class Categorization < ActiveRecord::Base
  attr_accessible :category_id, :product_id  # Should I leave these accessible?

  belongs_to :product
  belongs_to :category
end

我最终试图让它在终端中工作：

> product = Product.create(name: "Product A", description: "Product A description")
> Category.create(name: "Cat A")
> product.categories
> []
> product.categories = "Cat A"

Answer 1

您正在创建一个名为“Cat A”的类别，但是您要为product.categories分配字符串“Cat A”

试试这个：

product.categories.create(:name => "Cat A")

通过has_many：through为产品分配类别

1 个答案: