Ruby on rails 3.1 rspec2抛出'；未定义的方法'；对于模型类方法（.self）

我有一个model（event.rb）方法，用于检索指定时段的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

然后在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)>'

1）事件#日期#查找之间的重复发生事件的日期应查找并返回正确的重复发生日期
失败/错误：@event.dates\u介于（开始日期、结束日期）之间。应均衡（输出日期）
命名错误：
未定义的方法“dates_between”#
#./spec/models/event_spec.rb:52:in'block（4层）in'

当我在模型中从类方法更改为实例方法（删除“self”）时，控制台只打印出“野生数据”：

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 “2012-12-01 22:94:25”、“2012-12-01 22:94:32”

---

有什么想法吗？

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\u between），而不是实例方法（Event.new.dates\u between）

• 第二，我预期
  [“2012-12-01 18:25:25”、“2012-12-08 18:25:25”、“2012-12-15 18:25:25”]

但是本应该在没有时间的情况下进行扩展，在预期的三天内，每一秒每一分钟迭代一次，这就把我的控制台搞砸了

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

不，我执行以下操作，规格为绿色：

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