PostgreSQL where all in array

Question

What is the easiest and fastest way to achieve a clause where all elements in an array must be matched - not only one when using IN? After all it should behave

Answer 1

This preserves ActiveRecord objects.

In the below example, I want to know the time sheets which are associated with all codes in the array.

codes = [8,9]

Timesheet.joins(:codes).select('count(*) as count, timesheets.*').
           where('codes.id': codes).
           group('timesheets.id').
           having('count(*) = ?', codes.length)

You should have the full ActiveRecord objects to work with. If you want it to be a true scope, you can just use your above example and pass in the results with .pluck(:id).