FactoryGirl:避免为1模型单元测试创建多个模型实例



Rails 3.2.13,Factory Girl,Minitest最划线。

我想为InvoicedItem型号定义工厂。此InvoicedItem属于(多态):owner。此owner可以是SpentItem。为了创建SpentItem,我需要创建其他几个记录(PricingGroupPriceRatioSupplier等),这很快就变成了一场噩梦。

是否有一种方法可以定义不使用现有模型的FactoryGirl中的关联?

基本上,我不想将几个相关模型实例化来测试InvoicedItem。我只需要InvoicedItem的owner响应以下方法:name_for_invoicebill_price_for_invoice

目前,我有这个:

需要'test_helper'

class FakeInvoicedItemOwner
  attr_accessor :name_for_invoice, :bill_price_for_invoice
end
FactoryGirl.define do
  factory 'FakeInvoicedItemOwner' do
    name_for_invoice { 'Fake Name' }
    bill_price_for_invoice { 12.0 }
  end
  factory 'Invoicing::InvoicedItem' do
    association :invoice, factory: 'Invoicing::Invoice'
    owner { FactoryGirl.build('FakeInvoicedItemOwner') }
    name { 'FG name' }
    billed_price { 1.0 }
  end
end

我总是会遇到与持续性相关的错误:undefined method 'primary_key' for FakeInvoicedItemOwner:Class

因为FactoryGirl试图坚持此FakeInvoicedItemOwner实例,但我正在尝试避免这种情况。有没有办法告诉FactoryGirl使用假物体而不是提供真实的模型工厂?

编辑:解决方案

(命名是错误的,Plus::SpentItemStub应该是Invoicing::Stubs::SpentItem

# class inheriting from an invoice-able item
# redefines the methods used for Invoicing
class Plus::SpentItemStub < Plus::SpentItem
  def name_for_invoice
    'fake name for invoicing'
  end
end
FactoryGirl.define do
  # factory for my fake model above
  factory 'Plus::SpentItemStub' do
  end
  factory 'Invoicing::InvoicedItem' do
    # relation owner using a stubbed instance of my fake model
    owner { FactoryGirl.build_stubbed('Plus::SpentItemStub') }
    # ...
  end
end

您仍然可以使用每种关系的真实模型,但使用build_stubbed而不是build,该CC_20应该更快且重量更轻:

https://robots.thoughtbot.com/use-factory-girls-build-pubbed-for-a-faster-test

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