How to create a column with a function as its default value?

Hi,

id: { type: 'uuid', primaryKey: true, defaultValue: 'uuid_generate_v4()' },

That column spec fails with

[WARN] Using unknown data type UUID
[ERROR] error: invalid input syntax for uuid: "uuid_generate_v4()"
    at Connection.parseE (C:\Users\critc\AppData\Roaming\npm\node_modules\db-migrate-pg\node_modules\pg\lib\connection.js:539:11)
    at Connection.parseMessage (C:\Users\critc\AppData\Roaming\npm\node_modules\db-migrate-pg\node_modules\pg\lib\connection.js:366:17)
    at Socket.<anonymous> (C:\Users\critc\AppData\Roaming\npm\node_modules\db-migrate-pg\node_modules\pg\lib\connection.js:105:22)
    at emitOne (events.js:96:13)
    at Socket.emit (events.js:188:7)
    at readableAddChunk (_stream_readable.js:172:18)
    at Socket.Readable.push (_stream_readable.js:130:10)
    at TCP.onread (net.js:542:20)

Is there some special notation to stop it being treated as a literal?

[Haharin]

For anyone else looking the correct way to do this is:

exports.up = (pgm) => { 
  pgm.createExtension('uuid-ossp'); // add uuid support to pg
  pgm.createTable('things', {
    id: { type: 'uuid', primaryKey: true, default: pgm.func('uuid_generate_v4()') },
  });
};

pgm.createExtension is not a function

can you help with this?

[webjay]

Here’s what works in May of 2021:

const tableName = 'my_log';

exports.up = async function(db) {
  await db.runSql('CREATE EXTENSION IF NOT EXISTS "pgcrypto";');
  return db.createTable(tableName, {
    id: { type: 'uuid', primaryKey: true, defaultValue: new String('gen_random_uuid()') },
    payload: { type: 'text' },
    created_at: { type: 'timestamp', notNull: true, defaultValue: new String('now()') },
  });
};

You’ll see [WARN] Using unknown data type UUID but it works.