Reusable pgTable column helper - losing type : [x: string] instead of user_id

Hi, I am trying to create a reusable column to use accross multiple tables. If I use the following :

export const userId = char("user_id", {
  length: 10,
}).references(() => users.id);

export const userId = char("user_id", {
  length: 10,
}).references(() => users.id);

I get the correct type in my KyselyDatabase interface. user_id: ColumnType<string, string, string>; I'd like it to be a function instead. But when I do the following :

export const userId = (name?: string) => {
  return char(name ?? "user_id", {
    length: 10,
  }).references(() => users.id);
};

export const userId = (name?: string) => {
  return char(name ?? "user_id", {
    length: 10,
  }).references(() => users.id);
};

I get the following type (thus breaking types accross all my db queries) [x: string]: ColumnType<string | null, string, string>;

4 Replies

pvman•5mo ago

When I use a var : char(name...) I have a return type of <PgCharBuilderInitial<string ... and if I use directly char("user_id") , I get the correct one : <PgCharBuilderInitial<"user_id" ...

Sillvva•5mo ago

Use a generic:

export function userId<TName extends string>(name?: TName) {
    return char(name ?? "user_id", {
        length: 10
    }).references(() => users.id);
};

export function userId<TName extends string>(name?: TName) {
    return char(name ?? "user_id", {
        length: 10
    }).references(() => users.id);
};

pvman•5mo ago

Thanks a bunch!!! Works perfectly.

Seifeddine LARGAT•4mo ago

hello , please i'm trying to do something similar but i'm getting a circular dependency here is where i define the shared columns :

const tokenCols = {
    id: serial('id').primaryKey(),
    userId: text('user_id')
        .notNull()
        .references(() => usersTable.id, { onDelete: 'cascade' }),
    email: text('email').notNull(),
    token: text('token').notNull(),
    expiresAt: timestamp('expires_at', { withTimezone: true, mode: 'date' }).notNull()
};

const timestampsCols = {
    createdAt: timestamp('created_at', { mode: 'date' }).notNull().defaultNow(),
    updatedAt: timestamp('updated_at', { mode: 'date' }).$onUpdate(() => new Date())
};

const coordinatesCols = {
    latitude: text('latitude'),
    longitude: text('longitude')
};

function lower(email: AnyPgColumn): SQL {
    return sql`lower(${email})`;
}

export {lower, coordinatesCols, timestampsCols, tokenCols };

const tokenCols = {
    id: serial('id').primaryKey(),
    userId: text('user_id')
        .notNull()
        .references(() => usersTable.id, { onDelete: 'cascade' }),
    email: text('email').notNull(),
    token: text('token').notNull(),
    expiresAt: timestamp('expires_at', { withTimezone: true, mode: 'date' }).notNull()
};

const timestampsCols = {
    createdAt: timestamp('created_at', { mode: 'date' }).notNull().defaultNow(),
    updatedAt: timestamp('updated_at', { mode: 'date' }).$onUpdate(() => new Date())
};

const coordinatesCols = {
    latitude: text('latitude'),
    longitude: text('longitude')
};

function lower(email: AnyPgColumn): SQL {
    return sql`lower(${email})`;
}

export {lower, coordinatesCols, timestampsCols, tokenCols };

error:

Cannot access 'timestampsCols' before initialization

Cannot access 'timestampsCols' before initialization

FYI: each table is defined in a single file (i'm using a barrel file to export the hole schema )

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Reusable pgTable column helper - losing type : [x: string] instead of user_id