如何在 rails 中指定和验证枚举? [英] How do i specify and validate an enum in rails?

问题描述

我目前有一个模型Attend，它将有一个状态列，而这个状态列只有几个值.STATUS_OPTIONS = {:yes, :no, :maybe}

I currently have a model Attend that will have a status column, and this status column will only have a few values for it. STATUS_OPTIONS = {:yes, :no, :maybe}

1) 我不确定如何在用户插入出席之前验证这一点?基本上是 java 中的枚举，但我怎么能在 Rails 中做到这一点?

1) I am not sure how i can validate this before a user inserts an Attend? Basically an enum in java but how could i do this in rails?

推荐答案

创建您想要的选项的全局可访问数组，然后验证您的状态列的值:

Create a globally accessible array of the options you want, then validate the value of your status column:

class Attend < ActiveRecord::Base

  STATUS_OPTIONS = %w(yes no maybe)

  validates :status, :inclusion => {:in => STATUS_OPTIONS}

end

然后您可以通过 Attend::STATUS_OPTIONS

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