如何指定和验证在轨枚举？ [英] How do i specify and validate an enum in rails?

问题描述

我现在有一个模型参加，将有一个状态栏，此状态栏将只有几个它的值。 STATUS_OPTIONS = {：是的，不，：也许}

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）我不知道我怎么可以验证该用户将一个参加过吗？基本上在java中的枚举，但我怎么能做到这一点的轨道？

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

创建你想要的选项全球访问的磁盘阵列，然后验证您的身份列的值：

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

您便可以通过访问可能的状态参加:: STATUS_OPTIONS

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