Question

所以，我试图通过以下测试来测试我的模型关联：

it 'retrieve items registered under person' do
  p = FactoryGirl.create(:person)
  o = FactoryGirl.create(:order, customer: p)
  o.customer.should == p
  i = FactoryGirl.create(:item)
  o.items << i
  o.save
  p.items.count.should == 1
end

我的模特：

class Person < AR:Base
  has_many :orders, :as => :customer
  has_many :items, :through => :orders
end

class Order < AR:Base
  has_many :items
  belongs_to :customer, :class_name => Person
end

class Item < AR:Base
  belongs_to :order
  has_one :customer, :class_name => Person, :through => :order
end

但是当我运行测试时，它会给我以下错误：

SQLite3::SQLException: no such column: orders.customer_type: SELECT COUNT(*) FROM "items" INNER JOIN "orders" ON "items"."order_id" = "orders"."id" WHERE "orders"."customer_id" = 1 AND "orders"."customer_type" = 'Person'

我做错了什么？

更新问题出在＆＃39;：as =＆gt; ：客户＆＃39;位。但我真正的问题在于测试。我应该在创建项目时分配一个订单。

Answer 1

这是因为:as选项指定了多态接口。这解释了where子句中的"orders"."customer_type" = 'Person'。我想你的意思是：

class Person < ActiveRecord::Base
  has_many :orders, :foreign_key => :customer_id
  has_many :items, :through => :orders
end

请参阅guide中的:as选项。

Answer 2

我认为Item应该通过订单属于客户

class Item < AR:Base
  belongs_to :order
  belongs_to :customer, :class_name => Person, :through => :order
end

has_many通过关联sql错误

2 个答案: