Store ActiveRecord enums in database as strings rather than integers

string_enum.rb

# Store enums in database as strings rather than integers.
#
# Wraps `ActiveRecord::Enum`; just use `string_enum` instead of `enum`.
# https://api.rubyonrails.org/v4.2.11.1/classes/ActiveRecord/Enum.html
#
# Usage:
#   extend StringEnum
#   string_enum status: [:active, :archived]
#
module StringEnum
  def string_enum(definitions)
    definitions.each do |name, values|
      enum name => values.each_with_object({}) { |value, enums| enums[value] = value.to_s }
      
      # override attribute getter to return a symbol
      define_method(name) { self[name]&.to_sym }
    end
  end
end