allow deleting registrations

src/rest/restreg.rs

@@ -1,4 +1,8 @@
-use rocket::{form::Form, response::Redirect, Route, State};
+use rocket::{
+    form::Form,
+    response::{Flash, Redirect},
+    Route, State,
+};
 use sea_orm::{ActiveModelTrait, DatabaseConnection, EntityTrait, Set};
 
 use crate::models::{day, trip, user};
@@ -42,6 +46,51 @@ async fn register(
     Redirect::to("/")
 }
 
-pub fn routes() -> Vec<Route> {
-    routes![register]
+#[derive(FromForm)]
+struct DeleteForm {
+    day: NaiveDateForm,
+    user: i32,
+}
+
+#[delete("/", data = "<delete>")]
+async fn delete(
+    db: &State<DatabaseConnection>,
+    delete: Form<DeleteForm>,
+    user: user::Model,
+) -> Flash<Redirect> {
+    let day = day::Entity::find_by_id(*delete.day)
+        .one(db.inner())
+        .await
+        .unwrap()
+        .expect("There's no trip on this date (yet)");
+
+    if delete.user != user.id {
+        return Flash::error(
+            Redirect::to("/"),
+            "Du kannst nur deine eigenen Anmeldungen löschen!",
+        );
+    }
+
+    let trip = trip::Entity::find_by_id((format!("{}", day.day.format("%Y-%m-%d")), user.id))
+        .one(db.inner())
+        .await
+        .unwrap();
+    match trip {
+        None => return Flash::error(Redirect::to("/"), "Du bist gar nicht angemeldet!"),
+        Some(trip) => {
+            trip::Entity::delete(trip::ActiveModel {
+                day: Set(trip.day),
+                user_id: Set(trip.user_id),
+                ..Default::default()
+            })
+            .exec(db.inner())
+            .await
+            .unwrap();
+        }
+    }
+
+    Flash::success(Redirect::to("/"), "Anmeldung erfolgreich gelöscht")
+}
+pub fn routes() -> Vec<Route> {
+    routes![register, delete]
 }