共享具有多个属性的枚举声明值 [英] Share enum declaration values with multiple attributes

问题描述

我想要一个具有多个属性的类，用数值保存工作日.

I want to have a class with several attributes that saves weekdays with numeric values.

summary_weekday    :integer
collection_weekday :integer

我想我可以将整数映射到值 使用 Enum 和两个声明:

I thought I could map the integers to values using Enum with two declarations:

enum summary_weekday: %w(monday tuesday wednesday thursday friday saturday sunday)
enum collection_weekday: %w(monday tuesday wednesday thursday friday saturday sunday)

但是 Rails 不接受，我不能在同一个类中定义相同的值两次.

But Rails doesn't accept that, I cannot define the same value twice in the same class.

您试图在模型上定义一个名为summary_weekday"的枚举QuestionCategory"，但这会生成一个实例方法星期一?"，它已经由另一个枚举定义.

You tried to define an enum named "summary_weekday" on the model "QuestionCategory", but this will generate a instance method "monday?", which is already defined by another enum.

我该如何解决这个问题?

How can I solve this?

推荐答案

从 Rails 5.0 开始，当您需要定义多个枚举时，您可以使用 _prefix 或 _suffix 选项具有相同的值.如果传递的值为 true，则方法以枚举的名称作为前缀/后缀.

As of Rails 5.0 you can use the _prefix or _suffix options when you need to define multiple enums with same values. If the passed value is true, the methods are prefixed/suffixed with the name of the enum.

class Invoice < ActiveRecord::Base
  enum verification: [:done, :fail], _prefix: true
end

也可以提供自定义前缀.

It is also possible to supply a custom prefix.

class Invoice < ActiveRecord::Base
  enum verification: [:done, :fail], _prefix: :verification_status
end

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