在rspec中的上下文内部循环无法正确设置let变量

Posted 2023-01-09

MY_HASH = 
  user_id: [:email, :first_name],
  email: [:last_name]


context "when object's single attribute changed" do
  let(:object)  double("my_object", :changed? => true) 

  before do
    allow(object).to receive("#attribute_changed?").and_return(true)
  end

  after do
    allow(object).to receive("#attribute_changed?").and_return(false)
  end

  MY_HASH.each do |attr, dependent_attrs|
    let(:attribute)  attr 

    it "should have all dependent attributes in right order for defaulting attribute" do
      expect(subject.send(:my_method)).to eq(dependent_attrs)
    end
  end
end

此处的属性始终被评估为email。我想一个个地遍历每个属性。

任何人都可以帮助我了解这里出了什么问题吗？

谢谢，

答案

这是因为您正在重新定义每个循环的attribute：

  MY_HASH.each do |attr, dependent_attrs|
    let(:attribute)  attr 

要解决此问题，您可以为每次迭代引入一个新的上下文/描述块：

  MY_HASH.each do |attr, dependent_attrs|
    describe("#attr") do
      let(:attribute)  attr 
      it "should have all dependent attributes ..." do
        # content of test here
      end
    end
  end