Rails Test&Mocha:如何在任何\u实例中存根特定的模型条件?

具体的 模型,但是 只有特定的对象和 每一个实例

person_bill:
   name: bill
   cool: false

person_steve:
   name: steve
   cool: false

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

但如果我再次从DB加载模型,它不会:

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

这是可行的,但会影响 比尔 同样,这不应该:

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

那我怎么能就这么说呢,但无论如何?有没有一个像这样的有条件的例子

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

提前谢谢!