0

我正在使用 RSpec 进行测试，而且我是 TDD 新手，我已经广泛搜索了解决方案，但我找不到任何真正适合我遇到的问题的东西。我正在使用 FactoryGirl 创建我的对象。我已经编写了传递 belongs_to has_many 关联的测试。但是最后一个测试失败了，即使上面的测试通过了费用的存在，费用数组也总是空的。

describe "expenses associations" do
  before { @job.save }
  let(:expense_one) { FactoryGirl.create(:expense, job: @job) }
  let(:expense_two) { FactoryGirl.create(:expense, job: @job) }

  it "should have expenses" do
    # This test passes
    expect(@job.expenses.find_by(id: expense_one.id).expenseamount).to eq expense_one.expenseamount
    expect(expense_one.expenseamount).to eq 12.34
  end
  it "should destroy associated expenses" do
    expenses = @job.expenses(true).to_a

    #This expectation passes
    expect(expense_one.job_id).to eq @job.id

    #This expectation will fail
    expect(expenses).not_to be_empty
  end

这是模型

class Job < ActiveRecord::Base
  has_many :expenses, dependent: :destroy
  validates :jobname, presence: true
  validates :jobamount, format: { with: /\A\d{1,6}(\.\d{0,2})?\z/ }, 
                      numericality: [greater_than_or_equal_to: 0, less_than_or_equal_to: 999999]
  validates :paidamount, format: { with: /\A\d{1,6}(\.\d{0,2})?\z/ }, 
                      numericality: [greater_than_or_equal_to: 0]
  validate :not_in_the_future
  validate :paid_less_than_billed

  class Expense < ActiveRecord::Base
  validates :expenseamount,   format: { with: /\A\d{1,5}(\.\d{0,2})?\z/ }, 
                      numericality: [greater_than_or_equal_to: 0, less_than_or_equal_to: 99999]
  validates :expensename, presence: true
  validates :job_id, presence: true

  belongs_to :job
4

1 回答 1

0

问题在于let. let 是惰性结构。这意味着它们只有在被调用时才会被评估。

在你的情况下，这意味着

expenses = @job.expenses(true).to_a # let not evaluated
expect(expense_one.job_id).to eq @job.id # let evaluated
expect(expenses).to be_empty
# now it should work
expenses = @job.reload.expenses(true).to_a
expect(expenses).to_not be_empty
于 2013-10-10T11:50:00.667 回答