discourse/app/assets/javascripts/admin/routes/admin_flags_route.js

Discourse.AdminFlagsIndexRoute = Discourse.Route.extend({
  redirect: function() {
    this.transitionTo('adminFlags.active');
  }
});

Discourse.AdminFlagsRouteType = Discourse.Route.extend({
  model: function() {
    return Discourse.FlaggedPost.findAll(this.get('filter'));
  },

  setupController: function(controller, model) {
    var adminFlagsController = this.controllerFor('adminFlags');
    adminFlagsController.set('content', model);
    adminFlagsController.set('query', this.get('filter'));
  }

});

Discourse.AdminFlagsActiveRoute = Discourse.AdminFlagsRouteType.extend({
  filter: 'active'
});


Discourse.AdminFlagsOldRoute = Discourse.AdminFlagsRouteType.extend({
  filter: 'old'
});