Question

我正在尝试测试after_initialize模型的item回调（has_many line_items）：

after_initialize :build_default_items, unless: :line_items?

回调：

  def build_default_items
    LineOfBusiness.all.each do |lob|
      line_items.new(line_of_business_id: lob.id)
    end
  end

我的测试看起来像：

  describe 'callbacks' do
    let(:user) { create :user }
    it 'should build default items' do

      lob1 = LineOfBusiness.create(id:1, name: "Name1", eff_date: Date.today,exp_date: Date.tomorrow,  create_user: user, update_user: user)
      lob2 = LineOfBusiness.create(id:2, name: "Name2", eff_date: Date.today,exp_date: Date.tomorrow, create_user: user, update_user: user)

      lob_count = LineOfBusiness.all.count # this is correct as 2

      item = build :item 

      expect(item.line_items.count).to eq(lob_count)
    end
  end

错误信息如下：

expected: 2
     got: 0

(compared using ==)

所以它在回调方法中失败了，它将LineOfBusiness.all视为Nil

  def build_default_items
    LineOfBusiness.all.each do |lob|  # <-- this is Nil so fails
      line_items.new(line_of_business_id: lob.id)
    end
  end

为什么在回调方法中为什么Nil？

Answer 1

line_items.count会向数据库发送查询，并且由于您未在line_items回调中保存after_initialize，因此规范将失败。而是尝试使用line_items.size。

expect(item.line_items.size).to eq(lob_count)

Rspec，工厂女孩和after_initialize

1 个答案: