Ruby 如何循环RSpec中主题的属性？

是否可以像这样循环使用subject属性：

subject { assignment }

its(:submissions).each do |submission|
  submission.grade should eq 100
end

我得到的错误是

未定义每个类的方法…

我也试过了

subject { assignment }
its(:submissions) do
  each do |submission|
    submission.grade should eq 100
  end
end

得到

未定义的方法“each” RSpec:：Core:：ExampleGroup:：Nested_4:：Nested_4:：Nested_1:：Nested_1:0x00000005f91ac8

---

您可以在示例中使用

subject

方法获取主题。因此，您可以这样做：

subject { assignment }
it "has some number of submissions, each with a grade of 100" do
  subject.submissions.each { |submission| submission.grade.should eq 100 }
end

旁注：请改为使用

让
：

let(:assignment) { create :assignment } # or whatever is necessary to create the assignment
it "has some number of submissions, each with a grade of 100" do
  assignment.submissions.each { |submission| submission.grade.should eq 100 }
end