当两件事相等时，RSpec eq 匹配器返回失败 [英] RSpec eq matcher returns failure when two things are equal

问题描述

在我的控制器测试中，我正在测试分配给实例变量的正确值.

In my controller test, I am testing the correct value is assigned to an instance variable.

当我这样做

expect(assigns(:conversations)).to eq @user_inbox

RSpec 告诉我:

 Failure/Error: expect(assigns(:conversations)).to eq @user_inbox

   expected: #<ActiveRecord::Relation [#<Mailboxer::Conversation id: 4, subject: "Dude, what up?", created_at: "2014-10-21 08:43:50", updated_at: "2014-10-21 08:43:50">]>
        got: #<ActiveRecord::Relation [#<Mailboxer::Conversation id: 4, subject: "Dude, what up?", created_at: "2014-10-21 08:43:50", updated_at: "2014-10-21 08:43:50">]>

   (compared using ==)

   Diff:

我发现预期和实际之间没有区别.我想知道是什么导致此测试失败.

I see that there is no difference between the expected and the actual. I would like to know what is causing this test to fail.

推荐答案

ActiveRecord::Relation 比较基于实际关系，而不是结果集.例如，

ActiveRecord::Relation compares based on the actual relation, not the result set. For example,

User.where(:id => 123) == User.where(:email => "[e-mail]")

会返回false，即使查询结果相同，因为实际查询不同.

will return false, even the query results are both the same, since the actual queries are different.

我怀疑您更关心查询结果而不是它的组成方式，在这种情况下，您可以使用 to_a 将关系转换为活动记录对象数组.请注意，Active Record 仅根据 id 属性的值定义相等性(未保存对象的特殊情况).

I suspect that you care much more about the query results rather than how it was composed, in which case you can use to_a to convert the relation to an array of active record objects. Note that Active Record defines equality based only on the value of the id attribute (with a special case for unsaved objects).

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