未保存到数据库的Rails简单模型属性

Question

我正在开发一个从Steam API读取数据的小型Rails 3应用程序。我所看到的是，我创建的任何ActiveRecord模型的模型属性都不会保存到数据库，也不会输出，如果我debug他们。

这里我的样品模型

class NonPlayableApp < ActiveRecord::Base 
    attr_accessor :name, :steam_id 
    attr_accessible :name, :steam_id 
end 

随着迁移文件之中：

class CreateNonPlayableApps < ActiveRecord::Migration 
    def change 
    create_table :non_playable_apps do |t| 
     t.string :name 
     t.string :steam_id 
     t.timestamps 
    end 
    end 
end 

下面是与Rails控制台几次试验，我得到相同的结果，当我尝试他们在一个控制器和inspect或yaml模型：

irb(main):001:0> temp = NonPlayableApp.new(steam_id: 33333, name: "Testing") 
=> #<NonPlayableApp id: nil, name: nil, steam_id: nil, created_at: nil, updated_at: nil> 
irb(main):002:0> temp.steam_id 
=> 33333 
irb(main):003:0> temp.name 
=> "Testing" 
irb(main):004:0> temp.save 
    (0.1ms) begin transaction 
    SQL (4.0ms) INSERT INTO "non_playable_apps" ("created_at", "name", "steam_id", "updated_at") VALUES (?, ?, ?, ?) [["created_at", Fri, 26 Feb 2016 19:40:37 UTC +00:00], ["name", nil], ["steam_id", nil], ["updated_at", Fri, 26 Feb 2016 19:40:37 UTC +00:00]] 
    (8.8ms) commit transaction 
=> true 
irb(main):005:0> temp.steam_id 
=> 33333 
irb(main):006:0> temp 
=> #<NonPlayableApp id: 64, name: nil, steam_id: nil, created_at: "2016-02-26 19:40:37", updated_at: "2016-02-26 19:40:37"> 
irb(main):007:0> temp2 = NonPlayableApp.first 
    NonPlayableApp Load (1.6ms) SELECT "non_playable_apps".* FROM "non_playable_apps" LIMIT 1 
=> #<NonPlayableApp id: 64, name: nil, steam_id: nil, created_at: "2016-02-26 19:40:37", updated_at: "2016-02-26 19:40:37"> 
irb(main):008:0> temp2.steam_id 
=> nil 
irb(main):009:0> temp2.name 
=> nil 

我错过了什么？

Answer 1

attr_accessor :name, :steam_id重写Rails为该属性自动生成的setter和getter方法。

只需从模型中删除attr_accessor :name, :steam_id行。