如何在Rails 3中验证非模型表单？ [英] How do I validate a non-model form in Rails 3?

问题描述

假设我有一个搜索表单，我想验证关键字的长度。我希望表单突出显示无效字段（如模型表单）。我已到处寻找，似乎无法找到有关在Rails 3中验证非模型支持的表单的任何有用信息。我试过了 validatable gem，但这似乎不起作用使用Rails 3：

 用于Login：Class的未定义方法`model_name'。 
  

有什么想法？

解决方案

使用Rails 3，你可以使用诸如Validations等一些
ActiveModel扩展来扩展普通旧Ruby对象。ActiveRecord是ActiveModel的扩展，支持DB。这里有一个很好的Railscast，用简单的例子来描述它：

在Rails 3中，Active Record的非数据库
功能是
被提取到主动模型中。这
允许您干净地添加验证
和其他功能无表
模型。 http://railscasts.com/episodes/219-active-model

Let's say I have a search form and I want to validate the length of the keyword. I want the form to highlight the invalid field (like model forms). I've looked everywhere and can't seem to find any useful information on validating non-model-backed forms in Rails 3. I've tried the validatable gem, but this doesn't seem to work with Rails 3:

undefined method `model_name' for Login:Class.

Any ideas?

解决方案

With Rails 3 you can extend "plain old Ruby objects" with some ActiveModel extensions like Validations etc. ActiveRecord is extension of ActiveModel with DB support. Here is a very good Railscast describing it with easy example:

In Rails 3 the non-database functionality of Active Record is extracted out into Active Model. This allows you to cleanly add validations and other features to tableless models. http://railscasts.com/episodes/219-active-model

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