Ruby on Rails，是否可以使模型验证依赖于输入? [英] Ruby on Rails, is it possible to make the model validation dependent on the input?

问题描述

在我的项目中，我有两个模型，Treatment 和 Category:

 class Category <ActiveRecord::Baseattr_accessible :typhas_many :治疗结尾班级待遇

所以在我的处理表单中，用户还可以选择类别(大约 4 个类别):

<%= f.label :category_id %><br/><%= f.collection_select :category_id, Category.find(:all), :id, :typ %>

所以我的问题是，我可以根据表单中选定的类别来验证 Treatment 模型吗?以及如何?

解决方案

可以使用

validate :something_based_on_categorydef something_based_on_category如果 self.category==.....结尾

当您想向模型添加错误时，您也可以使用 errors.add.

In my project I have two models, Treatment and Category:

 class Category < ActiveRecord::Base
   attr_accessible :typ
   has_many :treatments
 end  

 class Treatment < ActiveRecord::Base
   belongs_to :patient
   belongs_to :category
   attr_accessible :content, :day, :typ, :category_typ
 end

So in my treatment form the user can also choose the category (around 4 categories):

<div class="field">
  <%= f.label :category_id %><br />
  <%= f.collection_select :category_id, Category.find(:all), :id, :typ %>
</div>

So my question is, can I make the validation of the Treatment model dependent on the selected categories in the form? And how?

解决方案

You can use

validate :something_based_on_category

def something_based_on_category
  if self.category==.....
end

You also use errors.add when you want to add an error to the model.

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