我在美国读phd，如果您愿意和我交流的话可以加我QQ405602586，或者我的GTALK: StrongTSQ@gmail.com
多谢！

example:

class User < ActiveRecord::Base

  def good
    "good"
  end

end

user_spec.rb

  it "should succes through stub good" do
    Factory(:user)
    new_method = User.method(:new)

    User.stub(:new).and_return do |*args|
      #use original new method create instance
      user = new_method.call(*args)
      #only *user* this instance stub :good method
      user.stub(:good).and_return("not good")
      #return stubed instance
      user
    end

    #use *new* which stubed
    u = User.new
    u2 = User.first
    u.good.should == "not good"
    u2.good.should == "good"
  end

This way will not effect User instance which not generate through *new* method.

but use *any_instance.stubs* will effect the in scope. ]]> http://www.yakjuly.com/2010/11/how-to-stub-instance-method.html/comment-page-1#comment-454 Monex Thu, 16 Dec 2010 04:42:07 +0000 http://www.yakjuly.com/?p=137#comment-454 However there is also one stack level too deep error Now I dont really know if this means that something else is broken really badly now or if this can be worked around. However there is also one stack level too deep error Now I dont really know if this means that something else is broken really badly now or if this can be worked around.