loopback-component-migration

A library to add simple database migration support to loopback projects. support loopback v3.x

Migrations that have been run will be stored in a table called 'Migrations'. The library will read the loopback datasources.json files based on the NODE_ENV environment variable just like loopback does. The usage is based on the node-db-migrate project.

Installation

• Install in you loopback project:

npm install --save loopback-component-migration

• Create a component-config.json file in your server folder (if you don't already have one)

• Enable the component inside component-config.json.

{
  "loopback-component-migration": {
    "key": "value"
  }
}

Options:

• log

  [String] : Name of the logging class to use for log messages. (default: 'console')

• enableRest

  [Boolean] : A boolean indicating wether migrate/rollback REST api methods should be exposed on the Migration model. (default: false)

• migrationsDir

  [String] : Directory containing migration scripts. (default: server/migrations)

• dataSource

  [String] : Datasource to connect the Migration and MigrationMap models to. (default: db)

• acls

  [Array] : ACLs to apply to Migration and MigrationMap models. (default: [])

• public

  [Boolean] : A boolean indicating wether REST api methods should be exposed on the Migration and MigrationMap models. (default: false)

Running Migrations

Migrations can be run by calling the static migrate method on the Migration model. If you do not specify a callback, a promise will be returned.

Run all pending migrations:

Migrate.migrate('up', '', function(err) {});

Run all pending migrations upto and including 0002-somechanges:

Migrate.migrate('up', '0002-somechanges', function(err) {});

Rollback all migrations:

Migrate.migrate('down', '', function(err) {}); //*the second param can not be missed

Rollback migrations upto and including 0002-somechanges:

Migrate.migrate('down', '0002-somechanges', function(err) {});

Example migrations

module.exports = {
  up: function(app, next) {
    app.models.Users.create({ ... }, next);
  },
  down: function(app, next) {
    app.models.Users.destroyAll({ ... }, next);
  }
};

/* executing raw sql */
module.exports = {
  up: function(app, next) {
    app.dataSources.mysql.connector.query('CREATE TABLE `my_table` ...;', next);
  },
  down: function(app, next) {
   app.dataSources.mysql.connector.query('DROP TABLE `my_table`;', next);
  }
};