为什么当我尝试 user.save 时我的 rails 会回滚? [英] Why does my rails rollback when I try to user.save?

问题描述

我已经安装了 RailsTutorial 示例应用程序(类似 twitter 的应用程序)，并试图理解为什么当我尝试更新用户数据库时，以下控制台代码没有更新数据库.我期待用户信息在我使用 user.save 后得到更新.但是，这会回滚到未编辑的数据.这是由于基于用户的限制吗?

I have installed the RailsTutorial sample app(the twitter like application) and am trying to understand why the following piece of console code does not update the database when I try updating the user db. I am expecting the user information to get updated once I use the user.save. However, this rolls back to unedited data. Is this due to a user based restriction?

用户控制器:

class UsersController < ApplicationController

#before_filter :signed_in_user, only: [:index, :edit, :update, :destroy, :following, :followers]
# By default before filters apply to all actions
#before_filter :correct_user, only: [:edit, :update]
  def edit
    @user = User.find(params[:id])
  end

  def update

    @user = User.find params[:id]

    respond_to do |format|

    if @user.update_attributes(params[:user])
      flash[:notice] = "Profile updated"
      format.html { redirect_to(@user, :notice => 'User was successfully updated.') }
      format.json { respond_with_bip(@user) }
    else

      format.html { render :action => "edit" }
      format.json { respond_with_bip(@user) }
    end
    end
 end

  private


  def correct_user
    @user = User.find(params[:id])
    redirect_to(root_path) unless current_user?(@user)
  end

  def admin_user
    redirect_to(root_path) unless current_user.admin?
  end


end

Rails 控制台:

1.9.3-p392 :001 > user = User.find(109)


User Load (8.2ms)  SELECT "users".* FROM "users" WHERE "users"."id" = ? LIMIT 1  [["id", 109]]
 => #<User id: 109, name: "laurie", email: "[e-mail]", created_at: "2013-09-26 18:10:12", updated_at: "2013-09-26 18:10:12", password_digest: "$2a$10$aXEtun8Z2Deqy2wNxvFRNOjPczKQkYc1vDezP5OduJuF...", remember_token: "YhIUhgFm9iMewxdNOHJ45A", admin: false> 

1.9.3-p392 :002 > user.name = "larry"
 => "larry" 

1.9.3-p392 :003 > user.save
   (0.2ms)  begin transaction
  User Exists (0.6ms)  SELECT 1 AS one FROM "users" WHERE (LOWER("users"."email") = LOWER('[e-mail]') AND "users"."id" != 109) LIMIT 1
   (0.1ms)  rollback transaction
 => false 

用户模型:

class User < ActiveRecord::Base

# Declaration of public variables   
  attr_accessible :email, :name, :password, :password_confirmation
  has_secure_password
  has_many :microposts, dependent: :destroy
  has_many :relationships, foreign_key: "follower_id", dependent: :destroy
  has_many :followed_users, through: :relationships, source: :followed
  has_many :reverse_relationships, foreign_key: "followed_id", class_name: "Relationship", dependent: :destroy
  has_many :followers, through: :reverse_relationships, source: :follower

  before_save {email.downcase!}
  before_save :create_remember_token

  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}
  validates :password, presence: true, length: {minimum: 6}
  validates :password_confirmation, presence: true
  after_validation {self.errors.messages.delete(:password_digest)}

 private
    def create_remember_token
        self.remember_token = SecureRandom.urlsafe_base64
    end
end

推荐答案

您的用户模型可能有不满意的验证.由于您尚未发布这些内容，因此我无法真正解决您的问题.为了让生活更轻松，您可以调试用户不愿意保存的原因.

Your user model probably has validations which are not satisfied. Since you've not posted those I'm unable to really solve your question. To make live easier you can debug why your user isn't willing to save.

尝试运行

user.errors.full_messages

这应该会提示您出了什么问题.

which should give you a hint what's going wrong.

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