only allow guests to register for specific events; don't even show them the other trips

src/rest/mod.rs

@@ -37,6 +37,7 @@ async fn index(db: &State<SqlitePool>, user: User, flash: Option<FlashMessage<'_
             .num_days()
             + 1;
     }
+
     if user.is_cox || user.is_admin {
         let triptypes = TripType::all(db).await;
         context.insert("trip_types", &triptypes);
@@ -44,7 +45,12 @@ async fn index(db: &State<SqlitePool>, user: User, flash: Option<FlashMessage<'_
 
     for i in 0..show_next_n_days {
         let date = (Local::now() + Duration::days(i)).date_naive();
-        days.push(Day::new(db, date).await);
+
+        if user.is_guest {
+            days.push(Day::new_guest(db, date).await);
+        } else {
+            days.push(Day::new(db, date).await);
+        }
     }
 
     if let Some(msg) = flash {
@@ -86,6 +92,10 @@ async fn join(db: &State<SqlitePool>, trip_details_id: i64, user: User) -> Flash
             Redirect::to("/"),
             "Du kannst bei einer selbst ausgeschriebenen Fahrt nicht mitrudern ;)",
         ),
+        Err(UserTripError::GuestNotAllowedForThisEvent) => Flash::error(
+            Redirect::to("/"),
+            "Bei dieser Ausfahrt können leider keine Gäste mitfahren.",
+        ),
     }
 }