sql - Is there a way to use group to select the id's of the grouped records in Rails? - 


purchase.all.group( :user_id ).sum( :price )

this returns 

[{ 1 : 234 }, { 2 : 345 }, ...

is possible pull purchase ids?

for example, suppose first group returned:

{ user_id : 1, price : 234, ids : [3,6,9] }

using postgresql, can use array_agg:

purchase.select('user_id, sum(price) price, array_agg(id) ids').group('user_id')

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