ruby-on-rails – Rails测试和摩卡：如何存根特定模型 – 条件an

例如.给定类’Person’,其属性为’name'(字符串)和’cool'(布尔值).我们有两种型号：

person_bill:
   name: bill
   cool: false

person_steve:
   name: steve
   cool: false

现在我想要只是史蒂夫,这工作正常：

p1 = people(:person_steve)
p1.stubs(:cool? => true)
assert p1.cool? #works

但是,如果我再次从DB加载Model,它不会：

p1 = people(:person_steve)
p1.stubs(:cool? => true)
p1 = Person.find_by_name p1.name
assert p1.cool? #fails!!

这有效,但也影响比尔,不应该：

Person.any_instance.stubs(:cool? => true)
 assert people(:person_bill).cool? #doesn't fails although it should

那么我怎么能只是史蒂夫存根,但无论如何？是否有条件的any_instance之类的

Person.any_instance { |p| p.name == 'Steve' }.stubs(:cool? => true)

提前致谢！