如何测试（ActiveRecord的）对象相等

问题描述

在的Ruby 1.9.2 在的Rails 3.0.3 ，我试图测试的对象相等两个朋友（类继承自的ActiveRecord :: Base的）的对象。

In Ruby 1.9.2 on Rails 3.0.3, I'm attempting to test for object equality between two Friend (class inherits from ActiveRecord::Base) objects.

该对象是相等的，但测试失败：

The objects are equal, but the test fails:

Failure/Error: Friend.new(name: 'Bob').should eql(Friend.new(name: 'Bob'))

expected #<Friend id: nil, event_id: nil, name: 'Bob', created_at: nil, updated_at: nil>
     got #<Friend id: nil, event_id: nil, name: 'Bob', created_at: nil, updated_at: nil>

(compared using eql?)

只是为了笑着，我也测试对象的身份，从而未能如我所料：

Just for grins, I also test for object identity, which fails as I'd expect:

Failure/Error: Friend.new(name: 'Bob').should equal(Friend.new(name: 'Bob'))

expected #<Friend:2190028040> => #<Friend id: nil, event_id: nil, name: 'Bob', created_at: nil, updated_at: nil>
     got #<Friend:2190195380> => #<Friend id: nil, event_id: nil, name: 'Bob', created_at: nil, updated_at: nil>

Compared using equal?, which compares object identity,
but expected and actual are not the same object. Use
'actual.should == expected' if you don't care about
object identity in this example.

有人能向我解释为什么对象平等第一次测试失败，我怎样才能成功地断言这两个对象是相等的？

Can someone explain to me why the first test for object equality fails, and how I can successfully assert those two objects are equal?

推荐答案

Rails的故意代表平等检查标识列。如果你想知道如果两个AR对象包含同样的东西，比较呼吁双方#attributes的结果。

Rails deliberately delegates equality checks to the identity column. If you want to know if two AR objects contain the same stuff, compare the result of calling #attributes on both.

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