如何存储和比较：符号一个ActiveRecord（Ruby on Rails的） [英] How to store and compare :symbols in an ActiveRecord (Ruby on Rails)

问题描述

我认为这将是很好的使用常量来填充一个ActiveRecord表中的状态字段。但是，当涉及到检查，如果这种状态有一个特别的状态，我有麻烦。

I thought it would be good to populate a status field in an activeRecord table using constants. However, when it comes to checking if this status has a particular status, I'm having trouble.

如果我这样做，

e = Mytable.new
e.status = :cancelled
e.save

然后refind记录，并尝试和我的状态比作象征，检查失败。我从控制台一些输出，显示这一点。

then refind the record and try and compare my status to the symbol, the check fails. I have some output from the console to show this.

irb(main):060:0> e.status.eql?("cancelled")
=> true
irb(main):061:0> e.status.eql?(:cancelled)
=> false
irb(main):062:0> e.status == :cancelled
=> false
irb(main):063:0> e.status == "cancelled"
=> true
irb(main):064:0> e.status == :cancelled.to_s
=> true

是否有持有创纪录的状态更好的办法？是否有检测的方式，如果当前字段值等于：符号而不转换：符号为字符串？我想有可能是运营商，我不知道。

Is there a better way of holding a status in a record? Is there a way of testing if a current field value is equal to the :symbol without converting the :symbol to a string? I'm thinking there may be an operator I'm not aware of.

推荐答案

目前ecoologic的要求，这里是我的评论作为一个答案：

At the request of ecoologic, here is my comment as an answer:

ecoologic可以为你很好的解决方案，但我会建议从该转向远离，使一类，在它的常量。你可以做的事情一样e.status =状态::已取消。和国内这可能是一个字符串，也没关系。你还在使用常量，它会报错了，如果该常量不存在，这是清洁的方式。

ecoologic has a good solution for you, but I would recommend steering away from this and making a class with constants in it. That you can do things like e.status = Statuses::CANCELLED. And internally that could be a string and it doesn't matter. You're still using constants, and it will error out if that constant doesn't exist, and it's cleaner that way.

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