使用UUID在铁轨和多形体关系的主键 [英] using UUID as primary key in rails and polymorph relationships

问题描述

我要创建一个Rails 3应用程序，将分散，我需要使用 UUID 作为 主键的作为我的表，是什么将是最好的宝石，插件作业。我也想知道是否有可能使的ActiveRecord 不使用它的polymorphicable_type列，因为我使用UUID的情况下多态关系。

I'm creating a rails 3 application that will be decentralized and I need to use UUID as primary key for my tables, what would be the best gem, plugin for the Job. I also would like to know if it is possible to make in ActiveRecord polymorphic relationships without using the polymorphicable_type column for it, given the case that I'm using UUID.

我创建了一个演示 http://github.com/boriscy/uuidrails3 使用UUID作为密钥，您应检查模块UUIDHelper内的lib /和所有的迁移。没有必要添加在数据库中的主键，只是一个索引，因为主键验证字段的唯一性，但是我们并不需要与UUID

I have created a demo http://github.com/boriscy/uuidrails3 that uses UUID as keys, you should check the module UUIDHelper inside lib/ and also all the migrations. There is no need to add a primary key in the database, just an index, because primary keys verify uniqueness of the field, but we don't need that with UUID.

推荐答案

把的 lib目录此文件，并添加这是一个初始化：

Put this file in the lib directory, and add this as an initializer:

class ActiveRecord::Base
  set_primary_key :uuid

  before_create :set_uuid

  def set_uuid
    self.uuid = UUID.generate(:compact)
  end
end

对于关系，弗拉德是正确的ActiveRecord的需要知道哪一个表中的记录是找到它。如果你想这样的功能，尝试其他的东西像MongoMapper。

As for the relationships, vlad is right that ActiveRecord needs to know which table a record is in to find it. If you want this kind of functionality, try something else like MongoMapper.

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