1)Rails route

$ rake routes

match '/app/sessions', to: 'sessions#destroy', via: 'delete'

2)AngularJS "sessionResource" service

$ vi app/assets/javascripts/mymodule.js.erb

myModule.factory("sessionResource", function($resource) {
  return $resource("/app/sessions", {},
    {
      'create':  { method: 'POST' },
      'destroy': { method: 'DELETE' },
      'current_user': { method: 'GET', isArray: false }
    }
  );
});

3)Rails controller

$ vi app/controllers/sessions_controller.rb

  def destroy
    cookies.delete(:remember_token)
    head :no_content
  end

4)add link to navigation menu

$ vi app/views/layouts/_header.html.erb

<li><a href="" ng-click="signout()">Sign out</a></li>

5)AngularJS controller

$ vi app/assets/javascripts/mymodule.js.erb

function CollapseDemoCtrl($scope, flashService, sessionResource, $location) {
  $scope.signout = function() {
    sessionResource.destroy({}, function(response) {
      flashService.setUser(null);
      $location.path("/");
    });
  };
}