In Rails 4.2, how do I convert an integer to an enum?

Question

In Rails 4.2 I can write:

class Task < ActiveRecord::Base
  enum priority: { normal: 50, low: 0, high: 100 }
end

If I have a SQL query which (for obscure reasons) returns the priority as an integer, is there a simple way to convert that integer into its corresponding enumerated value, eg. :high?

(Obviously I can look up the key from the value in Task.priorities, or define my own reverse index, but presumably this is already implemented somewhere in Rails...)

Answer 1

Apparently in ruby 1.9+ I can write:

Task.priorities.key(100)
=> "high"

No idea if this is efficient, but since the hash table is small...