learn-request-queue/db/90-views.sql

CREATE OR REPLACE VIEW requests_vw AS
	SELECT url,COALESCE(videoTitle,url) AS title,displayName AS requester,imageUrl,state,score,reqTimestamp FROM requests
		JOIN requestMetadata USING (url)
		JOIN scores USING (url)
		JOIN users ON requests.requester = users.userid
		ORDER BY score DESC, reqTimestamp ASC;

CREATE OR REPLACE FUNCTION get_requests_voted(votinguserid int)
	RETURNS TABLE (
		url varchar,
		title varchar,
		requester varchar,
		imageUrl varchar,
		state varchar,
		score int,
		reqTimestamp timestamptz,
		voted bool
	)
	LANGUAGE SQL
	AS $$
		SELECT url,title,requester,imageUrl,state,score,reqTimestamp,
				(CASE WHEN votes.userid IS NULL THEN FALSE ELSE TRUE END) AS voted
			FROM requests_vw
			LEFT JOIN votes ON (requests_vw.url = votes.requesturl AND votes.userid = votinguserid)
			ORDER BY score DESC, reqTimestamp ASC;
	$$;

/*
View to determine the score added by votes from different classes of users. In
order for songs with no votes to show up in this view (and thus have their
scores properly calculated), the query must be JOINed to requests, the URL must
be selected as requests.url rather than votes.requesturl (which is null in the
case of no votes), and users.is{follower,subscriber} must be COALESCEd to FALSE
as in the case of no votes, user.* will be NULL.
 */

CREATE OR REPLACE VIEW vote_score_vw AS
	WITH votepoints AS (SELECT normaluservotepoints, followervotepoints, subscribervotepoints FROM config)
	SELECT requests.url AS url,
		COUNT(votes.requesturl) AS count,
		COALESCE(
			SUM(CASE
				WHEN users.isfollower = FALSE AND users.issubscriber = FALSE
				THEN votepoints.normaluservotepoints
				WHEN users.isfollower = TRUE AND users.issubscriber = FALSE
				THEN votepoints.followervotepoints
				WHEN users.issubscriber = TRUE
				THEN votepoints.subscribervotepoints
			END), 0
		) AS votescore
		FROM requests
		LEFT JOIN votes ON votes.requesturl = requests.url
		LEFT JOIN users on votes.userid = users.userid
		LEFT JOIN bans ON users.userid = bans.userid
		CROSS JOIN votepoints
		WHERE bans.userid IS NULL
		GROUP BY url;

CREATE OR REPLACE VIEW streamer_user_vw AS
	SELECT users.userid as userid, users.displayname as displayname, users.imageurl as imageurl FROM streamer
		LEFT JOIN users
			ON streamer.userid = users.userid;