Question

我一直在通过Rails教程，并被困在第7章。问题是，通过rails控制台（使用User.new）将注册信息发布到rails后，id，created_at和updated_at变为零。通过创建用户通过creaded用户网页，电子邮件变为零。

user.rb

class User < ApplicationRecord
  before_save { self.email = email.downcase! }
  VALID_EMAIL_REGEX = /\A[\w+\-.]+@[a-z\d\-]+(\.[a-z\d\-]+)*\.[a-z]+\z/i

  validates :name, presence: true, length: { maximum: 50 }
  validates :email, presence: true, length: { maximum: 255 },
        format: { with: VALID_EMAIL_REGEX },
        uniqueness: { case_sensitive: false }
  validates :password, presence: true, length: { minimum: 6 }

  has_secure_password
end

users_controller.rb

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

  def create
    @user = User.new(user_params)
    if @user.save
      flash[:success] = "Welcome to the Sample App!"
      redirect_to @user
    else
      render 'new'
    end
  end

  def show
    @user = User.find(params[:id])
  end

  private
    def user_params
      params.require(:user).permit(:name, :email, :password, 
                                               :password_confirmation)
  end
end

* new.html.erb *

<% provide(:titel, 'Sign Up') %>

<h1>Sign Up</h1>

<div class="row">
  <div class="col-md-6 col-md-offset-3">
    <%= form_for(@user, url: signup_path) do |f| %>
      <%= render 'shared/error_messages' %>

      <%= f.label :name %>
      <%= f.text_field :name, class: "form-control" %>

      <%= f.label :email %>
      <%= f.email_field :email, class: 'form-control' %>

      <%= f.label :password %>
      <%= f.password_field :password, class: "form-control" %>

      <%= f.label :password_confirmation, "Confirmation" %>
      <%= f.password_field :password_confirmation, class: "form-control" %>

      <%= f.submit "Create my account", class: "btn btn-primary" %>
    <% end %>
  </div>
</div>

rails控制台输出

irb(main):001:0> user = User.new(name: "Test User", email: "test@user.com", password: "secretsecret", password_confirmation: "secretsecret")
=> #<User id: nil, name: "Test User", email: "test@user.com", created_at: nil, updated_at: nil, password_digest: "$2a$10$E1SvEDh.aQSi809sQ7ecReacmSsnxRDUn3IbEawugQD...">

显示/sample_app/app/views/users/show.html.erb第7行引发：

def gravatar_for(user, size: 100)
  gravatar_id = Digest::MD5::hexdigest(user.email.downcase) # this line is highlighted
  gravatar_url = "https://secure.gravatar.com/avatar/#{gravatar_id}?=#{size}"
  image_tag(gravatar_url, alt: user.name, class: "gravatar")
end

通过检查development.sqlite3，电子邮件字段为零。

我哪里错了？谢谢！

Ruby 2.4，Rail 5.1

Answer 1

User.new实际上并未向控制器发出请求。它只是在内存中创建User对象的新实例而不将其保存到数据库中。如果你使用User.create使用相同的参数，你将获得一个id，一个更新的at和一个created_at - 但是这仍然没有向你的控制器发出一个post请求，它只是将它保存到你的数据库中。如果您想对控制器的新操作提出发布请求，您可以使用新的用户表单制作前端并提交，或者您可以使用postman或curl等方式向服务器发出请求。您还必须让您的服务在本地或其他地方运行。我建议在深入研究之前先复习纯红宝石。

https://www.ruby-lang.org/en/documentation/quickstart/3/

https://www.getpostman.com/

https://curl.haxx.se/docs/manpage.html

Answer 2

经过很长一段时间寻找错误，这是最终的咳嗽！它上面的主要问题是before_save { self.email = email.downcase! }代码。在user.rb模型中。before_save { self.email = email.downcase }，所以，不要强制下载！

Rails教程第7章用户无需电子邮件即可保存

2 个答案: