Introduce MaybeError type

src/data_provider/card_stats.rs

@@ -1,5 +1,5 @@
 use crate::data::entities::{CardStatistics, DeckSettings};
-use crate::notification::NotificationData;
+use crate::notification::{MaybeError, NotificationData};
 use crate::notification::NotificationData::{DbLoadError, DbSaveError};
 use log::info;
 use rusqlite::{Connection, params};
@@ -30,7 +30,7 @@ pub fn load_stats_of_deck(
     Ok(buffer)
 }
 
-pub fn add_stat_list(stats: &mut [CardStatistics], connection: &mut Connection) -> Result<(), NotificationData> {
+pub fn add_stat_list(stats: &mut [CardStatistics], connection: &mut Connection) -> MaybeError {
     let time = Instant::now();
     let tx = connection.transaction().expect("Failed to create transaction");
     let count = stats.len();
@@ -66,7 +66,7 @@ pub fn add_stat_list(stats: &mut [CardStatistics], connection: &mut Connection)
     Ok(())
 }
 
-pub fn update_stat_score(stat: &CardStatistics, connection: &Connection) -> Result<(), NotificationData> {
+pub fn update_stat_score(stat: &CardStatistics, connection: &Connection) -> MaybeError {
     let time = Instant::now();
 
     connection
@@ -79,7 +79,7 @@ pub fn update_stat_score(stat: &CardStatistics, connection: &Connection) -> Resu
     Ok(())
 }
 
-pub fn delete_stats(stat: &[CardStatistics], connection: &Connection) -> Result<(), NotificationData> {
+pub fn delete_stats(stat: &[CardStatistics], connection: &Connection) -> MaybeError {
     if stat.is_empty() {
         return Ok(());
     }