Rails 控制台添加 nil 而不是值

目前，当尝试通过 Rails 控制台或种子数据将新用户添加到我的用户表时，一切都为零。

在我的种子文件中，我正在运行：

u1 = User.create(:from_email => "[email protected] /cdn-cgi/l/email-protection", :to_email => "[email protected] /cdn-cgi/l/email-protection", :from_name=>"Vero", :to_name=>"Spencer", :message=>"Test message", :password=>"chicken", :id => 1)
u1.save!

如果我通过 Rails 中的种子数据或通过 Rails 控制台运行此命令，然后使用 User.all 检查 Postgres 数据库，我会得到：

#<User id: 1, from_name: nil, to_name: nil, from_email: nil, to_email: nil, message: nil, created_at: "2014-12-10 02:34:02", updated_at: "2014-12-10 02:34:02", password: nil>

我已经处理这个问题几个小时了，开始变得很困惑。我将不胜感激，我的模型和架​​构如下：

class User < ActiveRecord::Base
attr_accessor :from_name, :from_email, :to_name, :to_email, :message, :password, :id

before_save { self.from_email = from_email.downcase }
before_save { self.to_email = to_email.downcase }
before_save { self.password = "merrychristmas#{ Random.rand(1000) }" }

validates :id, :presence => true, :uniqueness => true
validates :from_name, :presence => true, :uniqueness => false
validates :to_name, presence: true, :uniqueness => false
validates :from_email, presence: true, format: { with: /\A[\w+\-.]+@[a-z\d\-.]+\.[a-z]+\z/i}
validates :to_email, presence: true, format: { with: /\A[\w+\-.]+@[a-z\d\-.]+\.[a-z]+\z/i }
validates :message, presence: true, length: { maximum: 50 }

def self.authenticate(id, password)
    user = find(id)
if user && user.password
        user
else
        nil
end
end

end

Schema:

ActiveRecord::Schema.define(version: 20141209104326) do

  # These are extensions that must be enabled in order to support this database
  enable_extension "plpgsql"

  create_table "users", force: true do |t|
    t.string   "from_name"
    t.string   "to_name"
    t.string   "from_email"
    t.string   "to_email"
    t.text     "message"
    t.datetime "created_at"
    t.datetime "updated_at"
    t.string   "password"
  end

end

SQL

(0.3ms)  BEGIN
  User Exists (0.5ms)  SELECT  1 AS one FROM "users"  WHERE "users"."id" = 2 LIMIT 1
  SQL (0.4ms)  INSERT INTO "users" ("created_at", "updated_at") VALUES ($1, $2) RETURNING "id"  [["created_at", "2014-12-10 04:15:33.579478"], ["updated_at", "2014-12-10 04:15:33.579478"]]
   (6.5ms)  COMMIT
=> #<User id: nil, from_name: nil, to_name: nil, from_email: nil, to_email: nil, message: nil, created_at: "2014-12-10 04:15:33", updated_at: "2014-12-10 04:15:33", password: nil>

你的问题是使用attr_accessor在你的模型中。仅当您想要为不想存储在数据库中的对象定义 getter/setter 方法时，才应使用此方法。See here https://stackoverflow.com/questions/2793098/usage-of-attr-accessor-in-rails了解更多信息。

删除整个开头的行attr_accessor你的代码将会工作。

同时删除分配id以及验证其存在的行。这是由数据库自动处理的。