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Ruby on Rails：如何在没有Active Record的情况下验证模型？

[英]Ruby on Rails: How to validate a model without Active Record?

原文 2012-03-22 05:20:37 0 2 ruby-on-rails/ validation/ activerecord/ model

I'm currently trying to validate fields without having an ActiveRecord::Base inheritance. 我目前正在尝试验证没有ActiveRecord::Base继承的字段。

My model stores the data on a cache server so I do not need ActiveRecord. 我的模型将数据存储在缓存服务器上，因此我不需要ActiveRecord。

Anyway, I would like to validate the fields of the model like I would if I was using ActiveRecord (eg validates_numericality_of :quantity, :greater_than => 0 ) ? 无论如何，我想验证模型的字段，就像我使用ActiveRecord一样（例如validates_numericality_of :quantity, :greater_than => 0 ）？

How can I do that? 我怎样才能做到这一点？

Thank you very much for your help. 非常感谢您的帮助。

2 个解决方案

In Rails 3, Active Model contains the non-database functionality of Active Record. 在Rails 3中，Active Model包含Active Record的非数据库功能。

Basically, you need to include ActiveModel::Validations , define your fields as attr_accessor , use an initialize method to initialize the attributes and make them non-persisted as your model isn't persisted to a database. 基本上，您需要包含ActiveModel::Validations ，将您的字段定义为attr_accessor ，使用initialize方法初始化属性并使其不持久化，因为您的模型不会持久保存到数据库。

This way you can have validations on the tableless model and your controller the same as if you were using Active Record. 这样，您可以对无表格模型和控制器进行验证，就像使用Active Record一样。 There's also a Railscast on this http://railscasts.com/episodes/219-active-model . 这个http://railscasts.com/episodes/219-active-model上还有一个Railscast。

Check out our Veto gem instead if you're looking for a standalone validations for ruby objects. 如果您正在寻找红宝石对象的独立验证，请查看我们的Veto gem 。 It's lightweight, and has no dependencies.. ActiveModel might be overkill. 它是轻量级的，没有依赖性.ActiveModel可能有点过分。