Rails Model中的enum（枚举）二三事

假设这么一个Model

class Order < ApplicationRecord
	enum type: {'支付宝充值': 1,'微信充值': 2,'后台手工加值':3,'后台手工减值':4,'提现':5,'发布问题减值':6,'答案被选中加值':7}
end

[1] pry(main)> order = Order.first
=>
[2] pry(main)> order.type
=> "后台手工减值"
[3] pry(main)> order.read_attribute_before_type_cast(:type)
=> 4

[1] pry(main)> Order.types
=> {"支付宝充值"=>1,"微信充值"=>2,"后台手工加值"=>3,"后台手工减值"=>4,"提现"=>5,"发布问题减值"=>6,"答案被选中加值"=>7}
[2] pry(main)> Order.types.keys
=> ["支付宝充值","微信充值","后台手工加值","后台手工减值","提现","发布问题减值","答案被选中加值"]
[3] pry(main)> Order.types.values
=> [1,2,3,4,5,6,7]
[4] pry(main)> Order.types[:后台手工减值]
=> 4
[5] pry(main)> Order.types.key(4)
=> "后台手工减值"

（编辑：李大同）

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