feat: error when starting BAL if user already has an ongoing one

src/entities/bal.rs

@@ -25,6 +25,11 @@ pub enum BalState {
     Ended
 }
 
+pub async fn get_user_ongoing_bal<C>(db_conn: &C, user_id: u32) -> Option<Model>
+where C: ConnectionTrait {
+    Entity::find().filter(Column::UserId.eq(user_id)).filter(Column::State.eq(BalState::Ongoing)).one(db_conn).await.unwrap_or(None)
+}
+
 #[derive(Copy, Clone, Debug, EnumIter, DeriveRelation)]
 pub enum Relation {
     #[sea_orm(has_many = "super::book_instance::Entity")]

src/routes/bal.rs

@@ -160,6 +160,7 @@ pub async fn update_bal(
     responses(
         (status = OK, body = bal::Model, description = "Successfully started bal"),
         (status = CONFLICT, description = "The specified BAL was not in a Pending state, cannot start it"),
+        (status = CONFLICT, description = "Cannot have multiple ongoing BALs at the same time !"),
         (status = NOT_FOUND, description = "No bal with specified id was found"),
         (status = FORBIDDEN, description = "You don't own the specified bal"),
     ),
@@ -179,6 +180,9 @@ pub async fn start_bal(
         if bal.state != BalState::Pending {
             return (StatusCode::CONFLICT, Json(None));
         }
+        if bal::get_user_ongoing_bal(state.db_conn.as_ref(), claims.user_id).await.is_some() {
+            return (StatusCode::CONFLICT, Json(None));
+        }
         let mut bal: bal::ActiveModel = bal.into();
         bal.state = Set(BalState::Ongoing);