如何在验证中为特定列设置保留字?

问题描述

我有一个名为 Community 的模型，它有一列名为 name

I have a model called Community and it has a column called name

我在子域中使用这个name.

例如，当用户访问http://rockstar.test-sample.com时，显示的内容与http://test-sample.com/community/rockstar

For example, when a user access to http://rockstar.test-sample.com, it show the same content as http://test-sample.com/community/rockstar

显然，这个name不应该是www

如果我在 models/community.rb 中声明，我如何禁止 www?

How can I prohibit www if I'm stating that in models/community.rb?

推荐答案

您可能想花一些时间使用 Active Record 验证指南:

You might want to spend some time with the Active Record Validations Guide:

2.4 排除

这个助手验证属性的值不包含在给定的集合中.事实上，这个集合可以是任何可枚举的对象.

This helper validates that the attributes' values are not included in a given set. In fact, this set can be any enumerable object.

class Account < ActiveRecord::Base
  validates :subdomain, exclusion: { in: %w(www us ca jp),
    message: "Subdomain %{value} is reserved." }
end

所以在你的模型中这样的东西应该可以解决问题:

So something like this in your model should do the trick:

validates :name, :exclusion => { in: %w[www] }

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