Ruby中的枚举 [英] Enumeration in Ruby on rails

问题描述

我是一个C＃程序员，我正在寻找在轨道上的红宝石。但是我有一些麻烦可能是用心灵设置或某些东西。

i am a C# programmer and i am looking in to ruby on rails. but i am having some trouble probably with the mind set or something.

我有一个对象投票，该对象可以是Pro，Neutral或con。

I have an object Vote, that object can be Pro, Neutral or con.

我将正常使投票对象有一些这样的东西这样的

I would normaly make the vote object have a field some thing like this

private VoteEnum voteEnum = VoteEnum.Neutral

我可以在ruby中填充这个。

how on earth can i acomplish this in ruby.

我发现了一些例子：

def MyClass < ActiveRecord::Base
  ACTIVE_STATUS = "active"
  INACTIVE_STATUS = "inactive"
  PENDING_STATUS = "pending"
end

然后，当使用另一个类的模型时，我引用常量

Then, when using the model from another class, I reference the constants

@model.status = MyClass::ACTIVE_STATUS
@model.save

对我来说似乎是正确的，但我的主要问题是我如何告诉模型，状态是枚举或constain的类型。

This seems correct to me but my main question is how do i tell the model that status is the type of enum or constain..

我希望你明白我的问题，希望你可以帮我弄清楚这一点。

I hope you understand my question, and hope you can help me get my mind wrapped around this.

推荐答案

Ruby不像C＃那样严格类型化。但是您可以使用验证来检查状态：

Ruby isn't strictly-typed like C#. But you can use validations to check what's in the status:

def MyClass < ActiveRecord::Base
    ACTIVE_STATUS = "active"
    INACTIVE_STATUS = "inactive"
    PENDING_STATUS = "pending"
    NUMERICAL_STATUS = 500 # this is weird but okay

    ALL_STATUSES = [ACTIVE_STATUS, INACTIVE_STATUS, PENDING_STATUS, NUMERICAL_STATUS]

    validates_inclusion_of :status, :in => ALL_STATUSES

end

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