RSpec：交换方法？例如stub另一种方法

Question

我们说我在模型上有一个嵌套的范围调用。

# model
scope :one, -> { ... }
scope :two, -> { ... }
scope :three, -> { ... }

def self.narrow_set_of_records
  one.two.three
end

为了简化测试，我希望能够two返回all而不是执行其通常的范围，返回one的所有结果。有没有办法用RSpec做到这一点？ e.g。

# This doesn't seem to be working
allow(Model).to receive(:two).and_return(:all)

Answer 1

It sounds like you want to actually mock a message chain.

something like this ought to work:

allow(Model).to receive_message_chain(:one, :two) {Model.all}