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48 lines
1.6 KiB
48 lines
1.6 KiB
4 weeks ago
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-- Un usuario solo puede tener un carrito. Antes había únicamente un índice no
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-- único y dos primeras peticiones simultáneas podían crear dos carritos.
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--
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-- La migración conserva el carrito más antiguo de cada usuario, copia en él
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-- los elementos de los demás y elimina los duplicados antes de crear la guarda.
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WITH canonicos AS (
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SELECT usuario_id, min(creado_en) AS primera_fecha
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FROM carrito
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WHERE usuario_id IS NOT NULL
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GROUP BY usuario_id
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), elegidos AS (
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SELECT c.usuario_id, min(c.id) AS carrito_id
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FROM carrito c
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INNER JOIN canonicos x
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ON x.usuario_id = c.usuario_id AND x.primera_fecha = c.creado_en
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GROUP BY c.usuario_id
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)
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INSERT INTO carrito_item (carrito_id, cancion_id, anadido_en)
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SELECT e.carrito_id, ci.cancion_id, min(ci.anadido_en)
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FROM carrito c
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INNER JOIN elegidos e ON e.usuario_id = c.usuario_id
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INNER JOIN carrito_item ci ON ci.carrito_id = c.id
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WHERE c.id <> e.carrito_id
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GROUP BY e.carrito_id, ci.cancion_id
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ON CONFLICT (carrito_id, cancion_id) DO NOTHING;--> statement-breakpoint
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WITH canonicos AS (
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SELECT usuario_id, min(creado_en) AS primera_fecha
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FROM carrito
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WHERE usuario_id IS NOT NULL
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GROUP BY usuario_id
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), elegidos AS (
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SELECT c.usuario_id, min(c.id) AS carrito_id
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FROM carrito c
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INNER JOIN canonicos x
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ON x.usuario_id = c.usuario_id AND x.primera_fecha = c.creado_en
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GROUP BY c.usuario_id
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)
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DELETE FROM carrito c
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USING elegidos e
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WHERE c.usuario_id = e.usuario_id AND c.id <> e.carrito_id;--> statement-breakpoint
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DROP INDEX IF EXISTS "carrito_usuario";--> statement-breakpoint
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CREATE UNIQUE INDEX "carrito_usuario_unico"
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ON "carrito" ("usuario_id")
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WHERE "usuario_id" IS NOT NULL;
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