How to ActiveRecord get query values rather than models? - ruby-on-rails-4

Question

I have a query that is working as expected, but the result is coming back as an array of models, rather than the values. The query transforms a date, and then groups by that date.
The ActiveRecord query statement:
Participant.
select(
"count(*)",
"date_trunc('month', participants.completed_at) as Date").
group('Date')
which returns:
[ #<Participant id: nil>,
#<Participant id: nil>,
#<Participant id: nil>,
#<Participant id: nil> ]
Interestingly, the relevant data is there on the Participant... for example, if I look at the model it shows me the information I need:
pry(main)> results.first.attributes
=> {"count"=>70, "date"=>2014-04-01 00:00:00 UTC, "id"=>nil}
But it's sort of strange, since neither count, nor date are attributes of that model.
The raw SQL query:
SELECT
count(*),
date_trunc('month', participants.completed_at) as Date
FROM "participants"
WHERE "participants"."deleted_at" IS NULL
GROUP BY Date;
Which returns:
count | date
-------+---------------------
5742 | [NULL]
590 | 2016-05-01 00:00:00
798 | 2016-06-01 00:00:00
293 | 2017-01-01 00:00:00
I know that I can simply map the results to format it the way I want, but I would like to get the data directly from the ActiveRecord statement as an array or hash, rather than on a model object.