Group and count in Rails

Question

I know I\'ve seen this before but I can\'t find anything now. I want to group a query by a certain column and be able to display how many are in each group. I got the first part

Answer 1

I think you can try this as well.

@project.line_items.group(:device_id).pluck("device_id, count(device_id)")

^^ This gives array of arrays with elements 'device_id and count'