我有以下设置：
楷模：
class Product < ActiveRecord::Base
has_one :product_category
attr_accessible :name, :product_category, :product_category_id
end
class ProductCategory < ActiveRecord::Base
belongs_to :product
attr_accessible :name
end
迁移：
class CreateProducts < ActiveRecord::Migration
def change
create_table :products do |t|
t.references :product_category
t.string :name
t.timestamps
end
end
end
class CreateProductCategories < ActiveRecord::Migration
def change
create_table :product_categories do |t|
t.string :name
t.timestamps
end
end
end
现在，我想使用 FactoryGirl 和 RSpec 进行测试。所以我设置了以下 FactoryGirl 测试模型：
product_spec.rb
require 'factory_girl'
FactoryGirl.define do
factory :product, class: Product do
product_category {|a| a.association(:product_category)}
name "Demo Product"
end
end
product_category_spec.rb
require 'factory_girl'
FactoryGirl.define do
factory :product_category, class: ProductCategory do
name "Demo Product"
end
end
但是当我在 product_spec.rb 上运行 RSpec 时，我收到以下错误：
can't write unknown attribute 'product_id'
我无法弄清楚为什么会发生这种情况。如果我从产品工厂中删除 product_category，一切正常。