rspec'；什么是eq法？

我有点困惑：

class SessionsController < ApplicationController
    def new
        @user = User.new
    end
end

但我明白了： FFF

失败：

  1) SessionsController#new should eq #<User id: nil, name: nil, email: nil, created_at: nil, updated_at: nil, password_digest: nil>
     Failure/Error: it { expect(assigns(:user)).to eq user }

       expected: #<User id: nil, name: nil, email: nil, created_at: nil, updated_at: nil, password_digest: nil>
            got: #<User id: nil, name: nil, email: nil, created_at: nil, updated_at: nil, password_digest: nil>

       (compared using ==)

       Diff:
     # ./spec/controllers/sessions_controller_spec.rb:8:in `block (3 levels) in <top (required)>'

  2) SessionsController#new should eq #<User id: nil, name: nil, email: nil, created_at: nil, updated_at: nil, password_digest: nil>
     Failure/Error: it { expect(assigns(:user)).to eq User.new }

       expected: #<User id: nil, name: nil, email: nil, created_at: nil, updated_at: nil, password_digest: nil>
            got: #<User id: nil, name: nil, email: nil, created_at: nil, updated_at: nil, password_digest: nil>

       (compared using ==)

       Diff:
     # ./spec/controllers/sessions_controller_spec.rb:10:in `block (3 levels) in <top (required)>'

  3) SessionsController#new should assign stubbed user
     Failure/Error: assigns(:user).should eq user

       expected: #<User id: nil, name: nil, email: nil, created_at: nil, updated_at: nil, password_digest: nil>
            got: #<User id: nil, name: nil, email: nil, created_at: nil, updated_at: nil, password_digest: nil>

       (compared using ==)

       Diff:
     # ./spec/controllers/sessions_controller_spec.rb:13:in `block (3 levels) in <top (required)>'

1）会话控制器#新的应#
失败/错误：它{expect（assigns（：user））。to eq user}
预期：#
得到：#
（使用==进行比较）
差异：
#./spec/controllers/sessions\u controllers\u spec.rb:8:in'block（3层）in'
2） 会话控制器#新的应为#
失败/错误：它{expect（assigns（：user））。to eq user.new}
预期：#
得到：#
（使用==进行比较）
差异：
#./spec/controllers/sessions\u controllers\u spec.rb:10:in'block（3层）in'
3） SessionController#新用户应分配存根用户
失败/错误：分配（：用户）。是否应eq用户
预期：#
得到：#
（使用==进行比较）
差异：
#./spec/controllers/sessions\u controller\u spec.rb:13:in'block（3层）in'

---

我是说什么？

Diff

部分甚至是空的。如果我使用的是

be

matcher，我会理解，但我使用的是

eq

，那么发生了什么事？

尝试使用eq方法比较

user.attributes

，它应该通过。

在ActiveRecord中，如果两个模型对象具有相同的类和相同的非零主键值，则认为它们是相等的

因此，如果两个相同的对象具有nil

id

值，则它们不相等

看

这可能看起来很奇怪，但是如果你认为这两个对象如果被保存了，就会被数据库分配两个不同的<代码> ID <代码>值，这是有意义的。因此，在分配ActiveRecord模型对象的

id

之前，它无法与另一个对象进行有意义的比较

  1) SessionsController#new should eq #<User id: nil, name: nil, email: nil, created_at: nil, updated_at: nil, password_digest: nil>
     Failure/Error: it { expect(assigns(:user)).to eq user }

       expected: #<User id: nil, name: nil, email: nil, created_at: nil, updated_at: nil, password_digest: nil>
            got: #<User id: nil, name: nil, email: nil, created_at: nil, updated_at: nil, password_digest: nil>

       (compared using ==)

       Diff:
     # ./spec/controllers/sessions_controller_spec.rb:8:in `block (3 levels) in <top (required)>'

  2) SessionsController#new should eq #<User id: nil, name: nil, email: nil, created_at: nil, updated_at: nil, password_digest: nil>
     Failure/Error: it { expect(assigns(:user)).to eq User.new }

       expected: #<User id: nil, name: nil, email: nil, created_at: nil, updated_at: nil, password_digest: nil>
            got: #<User id: nil, name: nil, email: nil, created_at: nil, updated_at: nil, password_digest: nil>

       (compared using ==)

       Diff:
     # ./spec/controllers/sessions_controller_spec.rb:10:in `block (3 levels) in <top (required)>'

  3) SessionsController#new should assign stubbed user
     Failure/Error: assigns(:user).should eq user

       expected: #<User id: nil, name: nil, email: nil, created_at: nil, updated_at: nil, password_digest: nil>
            got: #<User id: nil, name: nil, email: nil, created_at: nil, updated_at: nil, password_digest: nil>

       (compared using ==)

       Diff:
     # ./spec/controllers/sessions_controller_spec.rb:13:in `block (3 levels) in <top (required)>'