migrate-mongoose/examples/config-file-usage/db/migrations/1450107140857-add-default-user-state.js

A mongoose based migration framework for node

async function up () {
  await this('users').updateMany({}, { $set: { state: 'California' } });
}

async function down () {
  await this('users').updateMany({}, { $unset: { state: 1 } });
}

module.exports = {
  down,
  up
}