Make $resource respond to PUT or POST with $save

Resource.service.js

module.factory( 'Resource', [ '$resource', function( $resource ) {
    return function( url, params, methods ) {
      var defaults = {
        update: { method: 'put', isArray: false },
        create: { method: 'post' }
      };

      methods = angular.extend( defaults, methods );

      var resource = $resource( url, params, methods );

      resource.prototype.$save = function() {
        if ( !this.id ) {
          return this.$create();
        }
        else {
          return this.$update();
        }
      };

      return resource;
    };
  }]);