How to construct TSTZRANGE in rom-sql? - ruby

Question

I can't find how to write this query in rom-sql. Is it possible to add plain sql to where?
It looks for announcements which do not intersect with requests.
announcements.when and requests.when are tstzrange columns in postgres.
SELECT "announcements".* FROM "announcements" WHERE (
(SELECT COUNT(requests.id)
FROM requests
WHERE requests.id IN (1,2,3) AND
(TSTZRANGE(lower(requests.when) - INTERVAL '1 HOUR', upper(requests.when) + INTERVAL '1 HOUR', '()') &&
TSTZRANGE(lower(announcements.when)), upper(announcements.when), '()') AND
requests.user_id = 42
) = 0
)

Answer 1

Check out the 'Advance Postgres support' section of the docs, http://api.rom-rb.org/rom-sql/ROM/SQL/Postgres/Types looks like there is support TsTzRange range('tstzrange', range_read_type(:tstzrange))

Answer 2

I found a solution to my problem.
Not sure if it's the right way in rom-sql.
I'll accept better answer if any appear.
Until that, here's my solution - Sequel.lit
In my case I defined a method in Announcements relation:
def available(user_id)
request_ids = requests.by_user_id(user_id).confirmed.pluck(:id)
# +- 1 hour around request is not available
# last argument '()' means "do not include boundaries"
request_when = "TSTZRANGE(
lower(requests.when) - INTERVAL '1 HOUR',
upper(requests.when) + INTERVAL '1 HOUR',
'()'
)"
announcement_when = "TSTZRANGE(lower(announcements.when), upper(announcements.when), '()')"
where(Sequel.lit(
"(SELECT COUNT(requests.id)
FROM requests
WHERE requests.id IN (:request_ids) AND
#{request_when} && #{announcement_when} AND
requests.user_id = :user_id) = 0",
user_id: user_id, request_ids: request_ids
))
end