Question

运行测试时遇到此错误。我已经检查过以确保所有email_confirmation拼写正确并且（除非我疯了）他们是。我有点像Rails noob，所以它可能很简单。

用户模型

class User < ActiveRecord::Base
  attr_accessible :email, :email_confirmation, :first_name, :last_name,
                  :password, :password_confirmation
  has_secure_password

  before_save { |user| user.email = email.downcase }

  validates :first_name, presence: true, length: { maximum: 25 }
  validates :last_name, presence: true, length: { maximum: 25 }
  VALID_EMAIL_REGEX = /\A[\w+\-.]+@[a-z\d\-.]+\.[a-z]+\z/i
  validates :email, presence: true, format: { with: VALID_EMAIL_REGEX },
                    uniqueness: { case_sensitive: false }
  validates :email_confirmation, presence: true
  validates :password, presence: true, length: { maximum: 6 }
  validates :password_confirmation, presence: true
end

Rspec测试

require 'spec_helper'

describe User do
  before { @user = User.new(email: "user@example.com",
                            first_name: "John", last_name: "Smith",
                            password: "foobar", password_confirmation: "foobar",
                            email_confirmation: "user@example.com") }

  subject { @user }

  it { should respond_to(:first_name) }
  it { should respond_to(:last_name) }
  it { should respond_to(:email) }
  it { should respond_to(:email_confirmation) }
  it { should respond_to(:password_digest) }
  it { should respond_to(:password) }
  it { should respond_to(:password_confirmation) }
  it { should respond_to(:authenticate) }

  it { should be_valid }

  describe "when first name is not present" do
    before { @user.first_name = " " }
    it { should_not be_valid }
  end

  describe "when last name is not present" do
    before { @user.last_name = " " }
    it { should_not be_valid }
  end

  describe "when email is not present" do
    before { @user.email = @user.email_confirmation = " " }
    it { should_not be_valid }
  end

  describe "when password is not present" do
    before { @user.password = @user.password_confirmation = " " }
    it { should_not be_valid }
  end

  describe "when first_name is too long" do
    before { @user.first_name = "a" * 26 }
    it { should_not be_valid }
  end

  describe "when last_name is too long" do
    before { @user.last_name = "a" * 26 }
    it { should_not be_valid }
  end

  describe "when email format is invalid" do
    it "should be invalid" do
      addresses = %w[user@foo,com user_at_foo.org example.user@foo.
                             foo@bar_baz.com foo@bar+baz.com]
      addresses.each do |invalid_address|
        @user.email = invalid_address
        @user.should_not be_valid
     end      
    end
  end

  describe "when email format is valid" do
    it "should be valid" do
      addresses = %w[user@foo.COM A_US-ER@f.b.org frst.lst@foo.jp a+b@baz.cn]
      addresses.each do |valid_address|
        @user.email = valid_address
        @user.should be_valid
      end      
    end
  end

  describe "when email address is already taken" do
    before do
      user_with_same_email = @user.dup
      user_with_same_email.email = @user.email.upcase
      user_with_same_email.save
    end

    it { should_not be_valid }
  end

  describe "when password doesn't match confirmation" do
    before { @user.password_confirmation = "mismatch" }
    it { should_not be_valid }
  end

  describe "when email doesn't match confirmation" do
    before { @user.email_confirmation = "mismatch@example.com" }
    it { should_not be_valid }
  end

  describe "when password confirmation is nil" do
    before { @user.password_confirmation = nil }
    it { should_not be_valid }
  end

  describe "when email confirmation is nil" do
    before { @user.email_confirmation = nil }
    it { should_not be_valid }
  end

  describe "with a password that's too short" do
    before { @user.password = @user.password_confirmation = "a" * 5 }
    it { should be_invalid }
  end

  describe "return value of authenticate method" do
    before { @user.save }
    let(:found_user) { User.find_by_email(@user.email) }

    describe "with valid password" do
      it { should == found_user.authenticate(@user.password) }
    end

    describe "with invalid password" do
      let(:user_for_invalid_password) { found_user.authenticate("invalid") }

      it { should_not == user_for_invalid_password }
      specify { user_for_invalid_password.should be_false }
    end
  end
end

schema.rb

ActiveRecord::Schema.define(:version => 20130417021135) do

  create_table "users", :force => true do |t|
    t.string   "first_name"
    t.string   "last_name"
    t.string   "email"
    t.datetime "created_at",      :null => false
    t.datetime "updated_at",      :null => false
    t.string   "password_digest"
  end

  add_index "users", ["email"], :name => "index_users_on_email", :unique => true

end

Answer 1

您收到UnknownAttributeError，因为您的users表格中没有名为email_confirmation的列。默认情况下，ActiveRecord将查找与用于构造模型的属性相同的DB列，但此行尝试使用数据库不知道的属性构造User：

  before { @user = User.new(email: "user@example.com",
                        first_name: "John", last_name: "Smith",
                        password: "foobar", password_confirmation: "foobar",
                        email_confirmation: "user@example.com") }

您真的打算在数据库中保存电子邮件确认，还是只想在保存之前检查它是否与电子邮件匹配？我假设后者，Rails实际上已经内置了对此的支持：

class User < ActiveRecord::Base
  validates :email, :confirmation => true
  validates :email_confirmation, :presence => true
end

详细了解Rails Guide to Validations或validates_confirmation_of API文档。（你可能需要对:password_confirmation做同样的事情。）

Answer 2

我花了很多时间调试我自己的实例，我想我会第三种可能性。

我已经正确完成了迁移并通过检查rails控制台中的ActiveRecord进行了验证。我曾尝试多次从模式中重新创建数据库，并尝试多次重新运行迁移，但都无济于事。

在我的情况下，问题是我在运行单元测试时遇到了问题，而不是在运行时。问题是我的测试数据库在我的迁移/回滚测试中已经不同步了。解决方案非常简单。我所要做的就是用以下方法重置测试数据库：

rake db:test:prepare

Answer 3

我知道上面的答案标记正确并解决了OP的问题。但是，在此主题的许多stackoverflow帖子中都没有注意到此错误的另一个原因。当您忘记使用has_many的as：选项时，此错误可能以多对多的形式出现。例如：

class AProfile < ActiveRecord::Base
  has_many :profile_students
  has_many :students, through: :profile_students
end

class BProfile < ActiveRecord::Base
  has_many :profile_students
  has_many :students, through: :profile_students
end

class ProfileStudent < ActiveRecord::Base
  belongs_to :profile, polymorphic: :true
  belongs_to :student
end

class Student < ActiveRecord::Base
  has_many :profile_students
  has_many :aprofiles, through: :profile_students
  has_many :bprofiles, through: :profile_students
end

这会给你这个错误：

Getting “ActiveRecord::UnknownAttributeError: unknown attribute: profile_id

当您尝试执行以下操作时：

a = AProfile.new
a.students << Student.new

解决方案是在AProfile和BProfile中添加：as选项：

class AProfile < ActiveRecord::Base
  has_many :profile_students, as: :profile
  has_many :students, through: :profile_students
end

class BProfile < ActiveRecord::Base
  has_many :profile_students, as: :profile
  has_many :students, through: :profile_students
end

Answer 4

我有同样的问题，这就像魔法一样。对于要更新的每个模型，在迁移语句末尾添加此行。重置有关列的所有缓存信息，这将导致它们在下一个请求时重新加载。

    <ModelName>.reset_column_information

参考：https://apidock.com/rails/ActiveRecord/Base/reset_column_information/class

Answer 5

当一个表没有该列时，我有很多次出现此错误，但是这次我有一个奇怪的原因。由于某种原因，我的迁移是完美的，但是（奇怪的是）schema.rb尚未更新，因此rake db:migrate db:seed没有创建该列。我不知道为什么会这样。

TL; DR，如果您的迁移是最新的，请检查schema.rb并确保它也是

Answer 6

我有相同的消息错误，我修复了将params排序为数据库中列定义的相同顺序：

CONTROLLER

def create
    worktime = Worktime.create(name: params[:name], workhours: params[:workhours], organization: @organization, workdays: params[:workdays])

    render json: worktime
end

DATABASE

Table: worktimes
Columns:
id  int(11) AI PK
name    varchar(255)
workhours   text
organization_id int(11)
workdays    text

获取“ActiveRecord :: UnknownAttributeError：unknown属性：email_confirmation”rspec出错

6 个答案: