Drizzle Team•4mo ago

Zod table+field descriptor generic schema

I'm building a tRPC procedure for listing rows from a table. I want the user to control the ordering of result by supplying an array of objects with table and the corresponding column name. This works:

z.array(
  z.object({
    field: z.union([
      z
        .object({
          table: z.literal("scenarists"),
          field: createInsertSchema(scenarists).keyof(),
        })
        .transform(({ table, field }) => tables[table][field]),
      z
        .object({
          table: z.literal("users"),
          field: createInsertSchema(users).keyof(),
        })
        .transform(({ table, field }) => tables[table][field]),
    ]),
    order: z.enum(Object.keys(orders) as [keyof typeof orders]),
  }),
)

z.array(
  z.object({
    field: z.union([
      z
        .object({
          table: z.literal("scenarists"),
          field: createInsertSchema(scenarists).keyof(),
        })
        .transform(({ table, field }) => tables[table][field]),
      z
        .object({
          table: z.literal("users"),
          field: createInsertSchema(users).keyof(),
        })
        .transform(({ table, field }) => tables[table][field]),
    ]),
    order: z.enum(Object.keys(orders) as [keyof typeof orders]),
  }),
)

I wanted to create a generic function for constructing the descriptor schema based on provided table:

const createFieldDescriptorSchema = <T extends Table>(table: T) =>
  z
    .object({
      table: z.literal(table._.name as T["_"]["name"]),
      field: createInsertSchema(table).keyof(),
    })
    .transform((descriptor) => table[descriptor.field]);

const createFieldDescriptorSchema = <T extends Table>(table: T) =>
  z
    .object({
      table: z.literal(table._.name as T["_"]["name"]),
      field: createInsertSchema(table).keyof(),
    })
    .transform((descriptor) => table[descriptor.field]);

However, I've stumbled upon the following error:

Type 'addQuestionMarks<baseObjectOutputType<{ table: ZodLiteral<T["_"]["name"]>; field: ZodEnum<CastToStringTuple<UnionToTuple<keyof BuildInsertSchema<T, {}, false>, []>>>; }>, any>["field"] | undefined' cannot be used to index type 'T'.ts(2536)

Type 'addQuestionMarks<baseObjectOutputType<{ table: ZodLiteral<T["_"]["name"]>; field: ZodEnum<CastToStringTuple<UnionToTuple<keyof BuildInsertSchema<T, {}, false>, []>>>; }>, any>["field"] | undefined' cannot be used to index type 'T'.ts(2536)

Which (I think) is related to this. Any help would be greately apprecieated, as I'm really stuck at this...

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Zod table+field descriptor generic schema