Cumulative counts

[Fernando Shayani]

Is it possible to do cumulative counts using Rollup?

Example: count how many users exists on the application each month (cumulative):

• 2024_01 - 10 total users
• 2024_02 - 15 total users
• 2024_03 - 27 total users
• ...

Thanks!

[Andrew Kane]

Hi @shayani, two options are:

1. Do this in memory

   total = 0
   Rollup.series("New users").transform_values { |v| total += v; total }

2. Find / create a gem that adds a cumulative_count method to Active Record

   User.rollup("Cumulative users") { |r| r.cumulative_count }

[Fernando Shayani]

Thanks for the reply and for this awesome gem