h0qura
Last Updated: February 25, 2016
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943
· austinylin
70b52586bbb28927e1d872ba4e8d4fbd

Scope Sequences in ActiveRecord

Recently I have been working on Helpful which is a support tool being built through the Assembly platform.

Internally we use UUIDs for everything but for user facing interactions we wanted nice integer id numbers. So what we want is an auto incrementing unique integer column. Low and behold this doesn't exist in Postgres as far as I can tell. I took this opportunity to do something I have been itching to do, create a gem.

Introducing Sequential. Sequential is a thread safe ActiveRecord plugin which gives you a really easy to use auto incrementing unique integer column

Here is an example Rails mode for a widget:

class Widget < ActiveRecord::Base
  include ActiveRecord::UUID

  belongs_to :account
end

Let's add an auto incrementing unique integer column to Widget that is scoped on :account_id:

class Widget < ActiveRecord::Base
  include ActiveRecord::UUID

  belongs_to :account

  sequential scope: :account_id
end

All you have to do now is add a migration to create the column. By default the column is called sequential_id but we can override that:

sequential column: :number, scope: :account_id

That's it, nice and simple. Check it out: https://github.com/austinylin/sequential or gem install sequential

Many thanks to Pugio for his help in creating Sequential.

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