add notification on canceled trips; add explicit 'cancel trip' button

src/model/trip.rs

@@ -34,6 +34,20 @@ pub struct TripWithUserAndType {
     trip_type: Option<TripType>,
 }
 
+impl TripWithUserAndType {
+    async fn from(db: &SqlitePool, trip: Trip) -> Self {
+        let mut trip_type = None;
+        if let Some(trip_type_id) = trip.trip_type_id {
+            trip_type = TripType::find_by_id(db, trip_type_id).await;
+        }
+        Self {
+            rower: Registration::all_rower(db, trip.trip_details_id.unwrap()).await,
+            trip,
+            trip_type,
+        }
+    }
+}
+
 impl Trip {
     /// Cox decides to create own trip.
     pub async fn new_own(db: &SqlitePool, cox: &CoxUser, trip_details: TripDetails) {
@@ -154,15 +168,7 @@ WHERE day=?
 
         let mut ret = Vec::new();
         for trip in trips {
-            let mut trip_type = None;
-            if let Some(trip_type_id) = trip.trip_type_id {
-                trip_type = TripType::find_by_id(db, trip_type_id).await;
-            }
-            ret.push(TripWithUserAndType {
-                rower: Registration::all_rower(db, trip.trip_details_id.unwrap()).await,
-                trip,
-                trip_type,
-            });
+            ret.push(TripWithUserAndType::from(db, trip).await);
         }
         ret
     }
@@ -199,6 +205,31 @@ WHERE day=?
         .await
         .unwrap(); //Okay, as trip_details can only be created with proper DB backing
 
+        if max_people == 0 {
+            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 {
+                    let notes = if let Some(notes) = notes {
+                        format!(": {notes}")
+                    } else {
+                        String::from(".")
+                    };
+
+                    Notification::create(
+                        db,
+                        &user,
+                        &format!(
+                            "Die Ausfahrt von {} am {} um {} wurde abgesagt{}",
+                            cox.user.name, trip.day, trip.planned_starting_time, notes
+                        ),
+                        "Absage Ausfahrt",
+                        None,
+                    )
+                    .await;
+                }
+            }
+        }
+
         Ok(())
     }