How to redirect to state if specific stateParam is empty

Question

I\'m not sure if the way I am doing it is correct, any advice would be appreciated.

I have a Restaurant Selector, which the user can select a restaurant from. Then all o

Answer 1

I needed to get this working, so to add details to the answer from @NicolasMoise:

.state('restaurant', {
    url: '/restaurant/:restaurantId',
    template: "",
    onEnter: function ($state, $stateParams, $cookies) {
      console.log($stateParams.restaurantId);
      if (!$stateParams.restaurantId) {
        $stateParams.restaurantId = $cookies.restaurantId;
        $state.go('restaurant.restaurantID');
      }
    },
})

I didn't test the cookies portion of this, but the conditional and state change worked.