没有方法错误 - 从 rubystutorial.org 保存答案

【问题标题】：No method error - save from rubystutorial.org没有方法错误 - 从 rubystutorial.org 保存
【发布时间】：2014-06-18 03:10:39
【问题描述】：

我一直在 rubystutorial.org 上关注 Hartl 的书，但遇到了这个错误

当我运行 rspec 测试时，它告诉我该方法（保存）对用户不存在

这是我的代码和测试。我找不到它有什么问题以及为什么@user 中不存在该方法

user_spec.rb

require 'spec_helper'

describe User do

  before do
    @user = User.new(name: "Example User", email: "user@example.com") 
  end

  subject { @user }

  it { should respond_to(:name) }
  it { should respond_to(:email) }

  it { should be_valid }

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

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

  describe "when name is too long" do
    before { @user.name = "a" * 51 }
    it { should_not be_valid } 
  end

  describe "when email format is invalid" do
    it "shoud 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
        expect(@user).not_to 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
        expect(@user).to 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 = @user.email.upcase
      user_with_same_email.save
    end

    it { should_not be_valid }
  end

end

还有我的 user.rb

class User < ActiveRecord::Base
    before_save { self.email = email.downcase }
    validates(:name, presence: true, length: { maximum: 50 } )
    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 } )
end

确切的错误是

Failures:

1) User when email address is already taken 

 Failure/Error: user_with_same_email.save
 NoMethodError:
   undefined method `save' for "USER@EXAMPLE.COM":String
 # ./spec/models/user_spec.rb:55:in `block (3 levels) in <top (required)>'

Finished in 0.411 seconds
24 examples, 1 failure

Failed examples:

rspec ./spec/models/user_spec.rb:58 # User when email address is already take

【问题讨论】：

标签： ruby-on-rails ruby rspec save nomethoderror

【解决方案1】：

您正在定义一个用户，然后在下一行中将其更改为字符串（电子邮件，因此电子邮件没有保存方法）：

user_with_same_email = @user.dup
user_with_same_email = @user.email.upcase
user_with_same_email.save

你应该为此改变它：

user_with_same_email = @user.dup
user_with_same_email.email = @user.email.upcase
user_with_same_email.save

【讨论】：

【解决方案2】：

对象

这里的问题可以从错误本身看出：

“USER@EXAMPLE.COM”的未定义方法“保存”：字符串

您遇到的问题不是.save 不可用，而是您尝试调用它的对象无法处理它。 p>

问题与这一行有关：

user_with_same_email = @user.email.upcase

修复

问题是您将user_with_same_email 变量设置为@user.email.upcase。您可以执行zishe 建议的操作（设置新变量的email 属性）

我不太明白您想要实现什么 - 因为您的 User 模型在 before_save 回调中将电子邮件设置为 downcase。

【讨论】：