Ruby on rails Railstutotal（Michael Hartl）：清单6.25中的错误

因此，到目前为止，我一直遵循Rails教程，在进入清单6.25之前，它一直运行良好。教程说这里的“rails测试”应该是绿色的，但我变红了

错误 失败： UserTest#test(测试)电子邮件(地址)应(唯一[位置] 预期为零或为假

我99%确信我完全按照这本书去做，但我不知道出了什么问题

这里是user.rb

class User < ApplicationRecord
    attr_accessor :name, :email

    validates :name, presence: true, length: { maximum: 50 }
    VALID_EMAIL_REGEX = /\A[\w+\-.]+@[a-z\d\-]+(\.[a-z\d\-]+)*\.[a-z]+\z/i
    validates :email, presence: true, length: {maximum: 255}, 
        format: {with: VALID_EMAIL_REGEX}, 
        uniqueness: true
end

class用户

和用户_test.rb

require 'test_helper'

class UserTest < ActiveSupport::TestCase
  def setup
    @user = User.new(name: "Example User", email: "user@example.com")
  end

  test "should be valid" do
    assert @user.valid?
  end

  test "name should be present" do
    @user.name = "     "
    assert_not @user.valid?
  end

  test "email should be present" do
    @user.email = "     "
    assert_not @user.valid?
  end

  test "name should not be too long" do
    @user.name = "a" * 51
    assert_not @user.valid?
  end

  test "email should not be too long" do
    @user.email = "a" * 244 + "@example.com"
    assert_not @user.valid?
  end

  test "email validation should reject invalid addresses" do
    invalid_addresses = %w[user@example,com user_at_foo.org user.name@example.
                       foo@bar_baz.com foo@bar+baz.com]
    invalid_addresses.each do |invalid_address|
      @user.email = invalid_address
      assert_not @user.valid?, "#{invalid_address.inspect} should be invalid"
    end
  end

  test "email addresses should be unique" do
    duplicate_user = @user.dup
    @user.save
    assert_not duplicate_user.valid?
  end

end

需要“测试助手”
类UserTest

删除这一行，它会弄乱ActiveRecord

attr_accessor :name, :email

---

我不知道你这本书的哪个版本，但这就是书中现在的写法：

class User < ApplicationRecord
  validates :name,  presence: true, length: { maximum: 50 }
  VALID_EMAIL_REGEX = /\A[\w+\-.]+@[a-z\d\-.]+\.[a-z]+\z/i
  validates :email, presence: true, length: { maximum: 255 },
                    format: { with: VALID_EMAIL_REGEX },
                    uniqueness: { case_sensitive: false }
end

或者，同一封电子邮件可以只用大写字母或小写字母。我认为那样应该行得通。 以下是新书的链接，以防您不使用它，这会更好，因为您会遇到更少的错误：

---

如果书中说在用户模型中使用attr_accessor:name，：email，那么它必须是旧版本（在Rails 4之前，所以在2013年年中之前）。如果是这样的话，你应该得到最新版本的Rails5。

uniqueness: { case_sensitive: false }