验证：包括在轨基于父模型的属性值 [英] Validating :inclusion in rails based on parent Model's attribute value

问题描述

我有两个型号项目和Task`中，项目的has_many任务和任务属于项目

现在在我的工作模型我使用属性的项目做验证一个字段

 验证：努力，：包括=＆GT; 1 ..（project.effort）
 

这导致一个错误的method_missing：未定义的方法项目

问题是，我如何可以验证基于父母的属性值（Project.effort）子属性（Task.effort）在Rails的3？

解决方案

最后我做一个回调验证，如果它是无效抛出一个异常

。唯一的缺点是，该控制器具有捕获异常。

  

更新

     基于轨道3.0定制的验证

有一个更好的解决方案：   <一href="https://web.archive.org/web/20110928154550/http://zadasnotes.blogspot.com/2010/12/rails-3-validation-using-parent-models.html" rel="nofollow">https://web.archive.org/web/20110928154550/http://zadasnotes.blogspot.com/2010/12/rails-3-validation-using-parent-models.html

I have two models Project and 'Task` where project has_many tasks and task belongs to project

Now in my Task model I am doing validation on a field using attributes in the project

validates :effort, :inclusion => 1..(project.effort)

This results in an error method_missing: undefined method project

Question is, how can I validate a child attribute (Task.effort) based on a parent's attribute's value (Project.effort) in Rails 3?

解决方案

I ended up doing the validation in a callback and throwing an exception if it is not valid. The only drawback is that the controller has to catch the exception.

UPDATE

A better solution based on rails 3.0 custom validators: https://web.archive.org/web/20110928154550/http://zadasnotes.blogspot.com/2010/12/rails-3-validation-using-parent-models.html

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