stacker.news/prisma/migrations/20240323222903_replies/migration.sql

83 lines
3.4 KiB
PL/PgSQL

-- CreateTable
CREATE TABLE "Reply" (
"id" SERIAL NOT NULL,
"created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
"updated_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
"ancestorId" INTEGER NOT NULL,
"ancestorUserId" INTEGER NOT NULL,
"itemId" INTEGER NOT NULL,
"userId" INTEGER NOT NULL,
"level" INTEGER NOT NULL,
CONSTRAINT "Reply_pkey" PRIMARY KEY ("id")
);
-- CreateIndex
CREATE INDEX "Reply_ancestorId_idx" ON "Reply"("ancestorId");
-- CreateIndex
CREATE INDEX "Reply_ancestorUserId_idx" ON "Reply"("ancestorUserId");
-- CreateIndex
CREATE INDEX "Reply_level_idx" ON "Reply"("level");
-- CreateIndex
CREATE INDEX "Reply_created_at_idx" ON "Reply"("created_at");
-- AddForeignKey
ALTER TABLE "Reply" ADD CONSTRAINT "Reply_userId_fkey" FOREIGN KEY ("userId") REFERENCES "users"("id") ON DELETE RESTRICT ON UPDATE CASCADE;
-- AddForeignKey
ALTER TABLE "Reply" ADD CONSTRAINT "Reply_itemId_fkey" FOREIGN KEY ("itemId") REFERENCES "Item"("id") ON DELETE RESTRICT ON UPDATE CASCADE;
-- AddForeignKey
ALTER TABLE "Reply" ADD CONSTRAINT "Reply_ancestorUserId_fkey" FOREIGN KEY ("ancestorUserId") REFERENCES "users"("id") ON DELETE RESTRICT ON UPDATE CASCADE;
-- AddForeignKey
ALTER TABLE "Reply" ADD CONSTRAINT "Reply_ancestorId_fkey" FOREIGN KEY ("ancestorId") REFERENCES "Item"("id") ON DELETE RESTRICT ON UPDATE CASCADE;
CREATE OR REPLACE FUNCTION ncomments_after_comment() RETURNS TRIGGER AS $$
DECLARE
user_trust DOUBLE PRECISION;
BEGIN
-- grab user's trust who is commenting
SELECT trust INTO user_trust FROM users WHERE id = NEW."userId";
UPDATE "Item"
SET "lastCommentAt" = now_utc(), "ncomments" = "ncomments" + 1
WHERE id <> NEW.id and path @> NEW.path;
-- we only want to add the user's trust to weightedComments if they aren't
-- already the author of a descendant comment
UPDATE "Item"
SET "weightedComments" = "weightedComments" + user_trust
FROM (
-- for every ancestor of the new comment, return the ones that don't have
-- the same author in their descendants
SELECT p.id
FROM "Item" p
-- all decendants of p that aren't the new comment
JOIN "Item" c ON c.path <@ p.path AND c.id <> NEW.id
-- p is an ancestor of this comment, it isn't itself, and it doesn't have the same author
WHERE p.path @> NEW.path AND p.id <> NEW.id AND p."userId" <> NEW."userId"
GROUP BY p.id
-- only return p if it doesn't have any descendants with the same author as the comment
HAVING bool_and(c."userId" <> NEW."userId")
) fresh
WHERE "Item".id = fresh.id;
-- insert the comment into the reply table for every ancestor
INSERT INTO "Reply" (created_at, updated_at, "ancestorId", "ancestorUserId", "itemId", "userId", level)
SELECT NEW.created_at, NEW.updated_at, p.id, p."userId", NEW.id, NEW."userId", nlevel(NEW.path) - nlevel(p.path)
FROM "Item" p
WHERE p.path @> NEW.path AND p.id <> NEW.id AND p."userId" <> NEW."userId";
RETURN NEW;
END;
$$ LANGUAGE plpgsql;
-- insert the comment into the reply table for every ancestor retroactively
INSERT INTO "Reply" (created_at, updated_at, "ancestorId", "ancestorUserId", "itemId", "userId", level)
SELECT c.created_at, c.created_at, p.id, p."userId", c.id, c."userId", nlevel(c.path) - nlevel(p.path)
FROM "Item" p
JOIN "Item" c ON c.path <@ p.path AND c.id <> p.id AND p."userId" <> c."userId";