The simplest Enum you will ever find for your ActiveRecord models

I have been using a really useful snippet for a while now.

While dropping it today into a project I realized just how powerful it is:

  1. it’s a drop-in and will work on any project
  2. it’s database agnostic
  3. it’s dead simple
  4. it’s not sensitive to enum changes
  5. and more and more

Just as an into, an enum is a way to have string represented as integers in your database.


Because integers are much faster to index and query (at least on mysql).

MySQL has an enum solution but ActiveRecord can’t really use it without some nasty hacking and it’s really messy when you want to add another param.

Enough Said, here’s the snippet

  STATUS = { pending: 0, active: 1, inactive: 2, deleted: 3 }

  def status

  def status=(s)
    write_attribute(:status, STATUS[s])
view raw account.rb This Gist brought to you by GitHub.

This gives you the ability to work with the Account model like so:

>> account = Account.first
  Account Load (0.2ms) SELECT `accounts`.* FROM `accounts` LIMIT 1
=> #<Account id: 4, name: "KensoDev", subdomain: "kensodev", user_id: 6, created_at: "2012-05-08 16:06:31", updated_at: "2012-05-08 16:29:11", logo_file_name: nil, logo_content_type: nil, logo_file_size: nil, logo_updated_at: nil, token: "5022N7VSAD", plan_id: 1, project_count: 1, contact_count: 1, quota_used: 0, notification_interval: nil, billing_token: "", status: 1>
>> account.status
=> :active
>> account.status = :pending
=> :pending
  SQL (0.1ms) BEGIN
  Account Load (0.3ms) SELECT `accounts`.`id` FROM `accounts` WHERE (`accounts`.`subdomain` = BINARY 'kensodev') AND (`accounts`.id <> 4) LIMIT 1
User Load (0.2ms) SELECT `users`.* FROM `users` WHERE (`users`.`id` = 6) LIMIT 1
Plan Load (0.2ms) SELECT `plans`.* FROM `plans` WHERE (`plans`.`id` = 1) LIMIT 1
User Load (0.3ms) SELECT `users`.`id` FROM `users` WHERE (LOWER(`users`.`email`) = LOWER('')) AND (`users`.id <> 6) LIMIT 1
[paperclip] Saving attachments.
AREL (0.2ms) UPDATE `accounts` SET `status` = 0, `updated_at` = '2012-05-08 16:29:40' WHERE (`accounts`.`id` = 4)
[paperclip] Saving attachments.
SQL (1.5ms) COMMIT
=> true

As you can see, it’s being persisted into the database as an integer, but you work with symbols/strings which is much nicer and cleaner.

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