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