将 Rails 3.2 升级到 Rails 4 和 Params

问题描述

我使用本教程将我的项目从 Rails3 升级到 Rails4:RailsCasts

I was upgrading my project from Rails3 to Rails4 with this tutorial: RailsCasts

我有一个模型:

  class Test < ActiveRecord::Base
    validates :content, :presence => true, :length => { :minimum => 2 }
    validates :name, :presence => true,    :length => { :minimum => 2 }
    validates :value, :presence => true
  end

升级后，在 Rails 控制台中，我尝试创建新的测试对象

After upgrading, in rails console I tried to create new test object

   Test.create(name: "asd", content:"asd", value: 5)

得到了

  WARNING: Can't mass-assign protected attributes for Achievement: name, content, value
  (0.2ms)  BEGIN
  (0.2ms)  ROLLBACK
=> #<Test id: nil, name: nil, content: nil, value: nil, created_at: nil, updated_at: nil>

我好像忘记升级东西了.我尝试使用覆盖配置和其他 rails 文件重新创建 rails 应用程序，但没有任何改变.

Looks like I forgot to upgrade something. I tried to re-create rails application with overriding config and other rails files, but nothing changed.

我创建了新的空项目并复制了模型文件.运行正常.

I created new empty project and copied model files. It was working OK.

如果我要补充

config.active_record.whitelist_attributes = false

到 config/application.rb，我升级后的项目将运行良好.但是不正常，因为在空的rails4中，这一行被删除了.

to config/application.rb, my upgraded project will be working good. But it's not normal, because in empty rails4, this line was deleted.

我忘记升级什么或我必须做什么，使升级后的项目像使用 rails4 创建的空一样工作，而没有 config.activerecord ...?

What I forgot to upgrade or what must I do, to make upgraded project to work like empty created with rails4 and without config.activerecord ...?

raw_params = {:name => "asdasd", :content=>"asdasdasd", :value=>5}
=> {:name=>"asdasd", :content=>"asdasdasd", :value=>5}
2.0.0dev :002 > params = ActionController::Parameters.new(raw_params)
=> {"name"=>"asdasd", "content"=>"asdasdasd", "value"=>5}
2.0.0dev :003 >  test = Test.create(params.permit(:name, :value, :content))
WARNING: Can't mass-assign protected attributes for Achievement: name, value, content
 (0.2ms)  BEGIN
 (0.2ms)  ROLLBACK
=> #<Test id: nil, name: nil, content: nil, value: nil, created_at: nil, updated_at: nil>

推荐答案

在 Rails 4 中，attr_accessible 不再用于进行批量赋值检查.批量分配是指通过传递值的散列来创建或更新模型对象的做法.在 Rails 4 中进行批量赋值时，必须指定哪些参数是允许的，哪些是不允许的.这是出于安全原因.

In Rails 4, attr_accessible is not used any more to do mass-assignment checking. Mass-assignment refers to the practice of creating or updating a Model object by passing a hash of values. When you do mass-assignment in Rails 4, you have to specify which parameters are allowed and which ones are not. This is due to security reasons.

查看strong_parameters 的存储库，其中简要说明了批量分配安全性适用于 Rails 4.特别是查看在控制器之外使用.

Take a look at the repository for strong_parameters, it contains a brief explanation of how mass-assignment security works in Rails 4. Especially look at Use Outside Of Controllers.

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