比较 ActiveRecord 对象与 Rspec [英] Comparing ActiveRecord objects with Rspec

问题描述

在 Rspec 中是否有一种比较两个 ActiveRecord 对象同时忽略 id 和 c 的好方法?例如，假设我从 XML 解析一个对象并从一个装置加载另一个对象，并且我正在测试的是我的 XML 解析器是否正常工作.我目前拥有的是带有

Is there a good way in Rspec to compare two ActiveRecord objects while ignoring id, &c? For example, say I'm parsing one object from XML and loading the other from a fixture, and what I'm testing is that my XML parser works correctly. What I currently have is a custom matcher with

actual.attributes.reject{|key,v| %w"id updated_at created_at".include? key } == expected.attributes.reject{|key,v| %w"id updated_at created_at".include? key }

但我想知道是否有更好的方法.

But I'm wondering if there's a better way.

然后稍微复杂一点，但是有没有办法在 set 上做类似的事情?说 XML 解析器还创建了几个属于原始对象的对象.所以我最终得到的集合应该是相同的，除了 id、created_at 和 &c，我想知道除了循环、清除这些变量和检查之外，是否有一种很好的方法来测试它.

And then slightly more complicated, but is there a way to do a similar thing on a set? Say said XML parser also creates several objects that belong_to the original object. So the set I'm ending up with should be identical except for id, created_at, &c, and I'm wondering if there's a good way to test that beyond just cycling through, clearing out those variables, and checking.

推荐答案

编写上述内容的更短方法是 actual.attributes.except(:id, :updated_at, :created_at).

A shorter way to write the above would be actual.attributes.except(:id, :updated_at, :created_at).

如果你经常使用它，你总是可以像这样定义你自己的匹配器:

If you are using this a lot, you can always define your own matcher like this:

RSpec::Matchers.define :have_same_attributes_as do |expected|
  match do |actual|
    ignored = [:id, :updated_at, :created_at]
    actual.attributes.except(*ignored) == expected.attributes.except(*ignored)
  end
end

把它放入你的 spec_helper.rb 你现在可以在任何例子中说:

Put this into your spec_helper.rb you can now say in any example:

User.first.should have_same_attributes_as(User.last)

祝你好运.

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