angular-localforage-migrations

Migrate localForage data in an Angular app

Usage

1. Depend on the angular-localforage-migrations module

// commonjs users:
var app = angular.module('my-app', [require('angular-localforage-migrations')])

// everyone else:
var app = angular.module('my-app', ['angular-localforage-migrations'])

2. Add migrations to migrationsProvider in a config block

app.config(function(migrationsProvider) {
  migrationsProvider.add({
    id: 1,
    migrate: ['dep', function(dep) {
      // migrate data here and return promise
    }]
  })
})

migration object passed to add()

Has required properties:

• id - Number greater than zero. The id field should increase for each migration. They do not have to be sequential and do not have to start at 1.
• migrate - An Angular injectable function. The $localForage service is injectable here along with Angular built-ins and your injectables. Should return a $q promise if doing async work.

3. Chain all data access off of migrations.migrate()

app.factory('my-data-service', function(migrations, $localForage) {
  return {
    getSomeData: function() {
      return migrations.migrate().then(function() {
        return $localForage.getItem('some-data')
      })
    }
  }
})

migrations.migrate()

Returns promise fulfilled when all pending migrations have been run.

A really basic live example

1. git clone https://github.com/psalaets/angular-localforage-migrations.git
2. cd angular-localforage-migrations/example
3. bower install
4. Open index.html in a browser

Namespacing considerations

If you are using this module in multiple apps on the same domain, you should supply a namespace for angular-localforage-migrations's internal data store.

That can be done on the migrationsProvider:

app.config(function(migrationsProvider) {
  migrationsProvider.setInternalNamespace('unique-string-for-app')
})

Install

npm

npm install angular-localforage-migrations --save

bower

bower install angular-localforage-migrations --save

Dependencies

This module can be used with browserify or by exposing global variables.

It assumes these modules are already loaded or can be required:

• angular
• angular-localforage

See of example/index.html for example of load order.

License

MIT