Rails, ActiveRecord, query id in array of ints, keep order of passed array

Question

I am thinking about the best solution for a problem. Let\'s say that we have a list of ids of ActiveRecord model:

ids = [1, 100, 5, 30, 4, 2, 88, 44]
         


        

Answer 1

Another possibility for Postgres (9.4 or later):

ordered_ids = [1, 100, 5, 30, 4, 2, 88, 44]
User.joins("join unnest('{#{ordered_ids.join(',')}}'::int[]) WITH " \
           "ORDINALITY t(id, ord) USING (id)").reorder('t.ord')

Notice that the reorder is extremely important.

Solution based on https://stackoverflow.com/a/35456954