rspec2 为模型类方法（.self）抛出“未定义的方法”答案

【问题标题】：rspec2 throws 'undefined method' for model class method (.self)rspec2 为模型类方法（.self）抛出“未定义的方法”
【发布时间】：2012-12-05 21:17:49
【问题描述】：

我有一个模型 (event.rb) 方法，它检索指定期间所有重复日期的列表

  def self.dates_between(start_date, end_date)
     dates = (start_date..end_date).step(7).to_a
  end

我在 event_spec.rb 中指定以下内容

  before(:each) do
    @event = FactoryGirl.create(:event)
  end    
  subject { @event }

  ... other working tests ...

  describe '#dates_between' do
    context 'finds recurrences dates of a event' do
      start_date = "2012-12-01 18:25:25"
      end_date = "2012-12-15 18:25:25"
      output_dates = ["2012-12-01 18:25:25", "2012-12-08 18:25:25", "2012-12-15 18:25:25"]

      it 'should call Event with method dates_between' do
        @event.should_receive(:dates_between).with(start_date, end_date)
        @event.dates_between(start_date, end_date)
      end

      it 'should find and return the RIGHT recurrences dates' do
        @event.dates_between(start_date, end_date).should eq(output_dates)
      end
    end
  end

并得到这个失败：

1) Event#dates_between finds recurrences dates of a event should find and return the RIGHT recurrences dates
 Failure/Error: @event.dates_between(start_date, end_date).should eq(output_dates)
 NoMethodError:
   undefined method `dates_between' for #<Event:0xb99e9f8>
 # ./spec/models/event_spec.rb:52:in `block (4 levels) in <top (required)>'

当我将模型从类方法更改为实例方法（删除“self.”）时，控制台只会打印出“wild data”：

22:93:55”、“2012-12-01 22:93:62”、“2012-12-01 22:93:69”、“2012-12-01” 22:93:76”、“2012-12-01 22:93:83”、“2012-12-01 22:93:90”、“2012-12-01 22:93:97”、“2012-12-01 22:94:04”、“2012-12-01 22:94:11”、“2012-12-01” 22:94:18”、“2012-12-01 22:94:25”、“2012-12-01 22:94:32”、...

有什么想法吗？

【问题讨论】：

标签： ruby-on-rails-3.1 rspec2 rspec-rails

【解决方案1】：

所以，我让它工作了，我犯了两个错误：

首先，我需要调用类方法 (Event.dates_between) 而不是实例方法 (Event.new.dates_between)
第二，我期待

[“2012-12-01 18:25:25”、“2012-12-08 18:25:25”、“2012-12-15 18:25:25”]

但应该已经没有时间了，这在预期的三天内每隔一分钟一小时迭代一次，搞砸了我的控制台

["2012-12-01", "2012-12-08", "2012-12-15"]

不，我做了以下，规格是绿色的：

describe Event do

  subject(:event) { FactoryGirl.create(:event) }

  describe '#dates_between' do
    context 'finds recurrences dates of a event' do
      start_date = "2012-12-01"
      end_date = "2012-12-15"
      output_dates = ["2012-12-01", "2012-12-08", "2012-12-15"]

      it 'should call dates_between with two arguments' do
        event.should_receive(:dates_between).with(start_date, end_date).and_return(output_dates)
        event.dates_between(start_date, end_date).should eq(output_dates)
      end

      it 'should find and return the RIGHT recurrences dates' do
        Event.dates_between(start_date, end_date).should eq(output_dates)
      end
    end
  end

end

【讨论】：