Introduce MaybeError type

src/data_provider/card_sets.rs

@@ -2,7 +2,7 @@ use crate::core::srs::OrderMode;
 
 use crate::data::entities::DeckSettings;
 use rusqlite::Connection;
-use crate::notification::NotificationData;
+use crate::notification::{MaybeError, NotificationData};
 use crate::notification::NotificationData::{DbLoadError, DbSaveError};
 
 pub fn load_sets(connection: &Connection) -> Result<Vec<DeckSettings>, NotificationData> {
@@ -28,7 +28,7 @@ pub fn load_sets(connection: &Connection) -> Result<Vec<DeckSettings>, Notificat
     Ok(buffer)
 }
 
-pub fn add_set(set: &mut DeckSettings, connection: &Connection) -> Result<(), NotificationData> {
+pub fn add_set(set: &mut DeckSettings, connection: &Connection) -> MaybeError {
     let index : u32 = connection
         .query_row(
             "INSERT INTO card_set (name, forward, backward, filter) VALUES (?1, ?2, ?3, ?4) RETURNING id",
@@ -46,7 +46,7 @@ pub fn add_set(set: &mut DeckSettings, connection: &Connection) -> Result<(), No
     Ok(())
 }
 
-pub fn update_deck(set: &mut DeckSettings, connection: &Connection) -> Result<(), NotificationData> {
+pub fn update_deck(set: &mut DeckSettings, connection: &Connection) -> MaybeError {
     if !set.id.is_valid() {
         add_set(set, connection)?;
     } else {
@@ -66,7 +66,7 @@ pub fn update_deck(set: &mut DeckSettings, connection: &Connection) -> Result<()
     Ok(())
 }
 
-pub fn delete_set(set: &DeckSettings, connection: &Connection) -> Result<(), NotificationData> {
+pub fn delete_set(set: &DeckSettings, connection: &Connection) -> MaybeError {
     if !set.id.is_valid() {
         return Err(DbSaveError);
     }