How to narrow type in select from enum?

During select I need to narrow enum type from multiple choices to one choice eg just 'product' schema

export const typAsortymentuEnum = pgEnum('typ_asortymentu', ['produkt', 'usluga']);
export const asortyment = pgTable('asortyment', {
    id: serial('id').primaryKey().notNull(),
    typ: typAsortymentuEnum('typ').notNull(),
   
})

export const typAsortymentuEnum = pgEnum('typ_asortymentu', ['produkt', 'usluga']);
export const asortyment = pgTable('asortyment', {
    id: serial('id').primaryKey().notNull(),
    typ: typAsortymentuEnum('typ').notNull(),
   
})

query

    const produkt = alias(asortyment, "produkt")
 const results = await db
        .select({
            id: produkt.id,
            typ: produkt.typ,
        })
        .from(produkt)
        .where(eq(produkt.typ, 'produkt'))
        .execute()

    const produkt = alias(asortyment, "produkt")
 const results = await db
        .select({
            id: produkt.id,
            typ: produkt.typ,
        })
        .from(produkt)
        .where(eq(produkt.typ, 'produkt'))
        .execute()

result typ value is typed as typ: "produkt" | "usluga"; and I need to narrow it to just product I would be glad for any tip how to accomplish this. Thanks!

1 Reply

tzezar•3mo ago

My attempt was to use sql operator like this:

  typ: sql<'produkt'>`${produkt.typ}`,

  typ: sql<'produkt'>`${produkt.typ}`,

but I believe there might be better solution

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How to narrow type in select from enum?