allow cancel of events

src/model/trip.rs

@@ -137,6 +137,10 @@ WHERE trip.id=?
             return Err(CoxHelpError::DetailsLocked);
         }
 
+        if planned_event.max_people == 0 {
+            return Err(CoxHelpError::CanceledEvent);
+        }
+
         match sqlx::query!(
             "INSERT INTO trip (cox_id, planned_event_id) VALUES(?, ?)",
             cox.id,
@@ -193,6 +197,9 @@ WHERE day=?
             return Err(TripUpdateError::TripDetailsDoesNotExist); //TODO: Remove?
         };
 
+        let tripdetails = TripDetails::find_by_id(db, trip_details_id).await.unwrap();
+        let was_already_cancelled = tripdetails.max_people == 0;
+
         sqlx::query!(
             "UPDATE trip_details SET max_people = ?, notes = ?, trip_type_id = ?, always_show = ?, is_locked = ? WHERE id = ?",
             max_people,
@@ -206,7 +213,7 @@ WHERE day=?
         .await
         .unwrap(); //Okay, as trip_details can only be created with proper DB backing
 
-        if max_people == 0 {
+        if max_people == 0 && !was_already_cancelled {
             let rowers = TripWithUserAndType::from(db, trip.clone()).await.rower;
             for user in rowers {
                 if let Some(user) = User::find_by_name(db, &user.name).await {
@@ -234,6 +241,14 @@ WHERE day=?
             }
         }
 
+        if max_people > 0 && was_already_cancelled {
+            Notification::delete_by_action(
+                db,
+                &format!("remove_user_trip_with_trip_details_id:{}", trip_details_id),
+            )
+            .await;
+        }
+
         let trip_details = TripDetails::find_by_id(db, trip_details_id).await.unwrap();
         trip_details.check_free_spaces(db).await;
 
@@ -318,6 +333,7 @@ pub enum CoxHelpError {
     AlreadyRegisteredAsRower,
     AlreadyRegisteredAsCox,
     DetailsLocked,
+    CanceledEvent,
 }
 
 #[derive(Debug, PartialEq)]