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WITH messages_ranks AS ( | |
SELECT *, | |
rank() OVER ( PARTITION BY channel_id ORDER BY created_at DESC) AS rank | |
FROM messages | |
) | |
SELECT row_to_json(t) | |
FROM ( | |
SELECT channels.id, | |
channels.name, | |
channels.owner_id, | |
( | |
SELECT array_to_json(array_agg(row_to_json(messages_arr))) | |
FROM ( | |
SELECT | |
messages_ranks.id, | |
messages_ranks.user_id, | |
messages_ranks.channel_id, | |
messages_ranks.text, | |
messages_ranks.created_at | |
FROM users | |
LEFT JOIN memberships | |
ON users.id = memberships.user_id | |
LEFT JOIN channels | |
ON channels.id = memberships.channel_id | |
LEFT JOIN messages_ranks | |
ON messages_ranks.channel_id = channels.id | |
WHERE users.id = 'b741c187-d7f5-42a0-ad8f-0eb038a1b2c8' | |
AND messages_ranks.rank <= 3 | |
ORDER BY messages_ranks.created_at DESC | |
) messages_arr | |
) as messages | |
FROM channels | |
) t; | |
/* responce: | |
{ | |
"id":"71aeb67e-1c72-435b-a9f8-c20d589aa917", | |
"name":"whatever", | |
"owner_id":"86c9df47-5c77-4939-bb90-0a6fca8cb4a3", | |
"messages":[ | |
{ | |
"id":"2bf6663f-a4a7-486e-a70a-e190eb2741d9", | |
"user_id":"b741c187-d7f5-42a0-ad8f-0eb038a1b2c8", | |
"channel_id":"73bd49d5-e8d1-477f-b10f-e9a51723bb6c", | |
"text":"whatever", | |
"created_at":"2018-12-07T23:34:37.577097" | |
}, | |
... | |
{ | |
"id":"0e69d185-472c-4ccb-9d3b-43b0b5c08e0b", | |
"user_id":"86c9df47-5c77-4939-bb90-0a6fca8cb4a3", | |
"channel_id":"3dc810e5-4e11-4447-847c-e41af8b0214c", | |
"text":"whatever", | |
"created_at":"2018-12-05T20:59:57.850526" | |
} | |
] | |
} | |
*/ |
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