User.save use upsert with mysql

src/db/models/user.rs

@@ -285,22 +285,14 @@ impl User {
         db_run! {conn:
             mysql {
                 let value = UserDb::to_db(self);
-                // Don't use replace_into() since it wants to delete the record first.
-                match diesel::update(users::table)
-                    .filter(users::uuid.eq(&self.uuid))
-                    .set(&value)
-                    .execute(conn)
-                {
-                    Ok(1) => Ok(()),
-                    Ok(_) => {
                 diesel::insert_into(users::table)
-                            .values(value)
+                    .values(&value)
+                    .on_conflict(diesel::dsl::DuplicatedKeys)
+                    .do_update()
+                    .set(&value)
                     .execute(conn)
                     .map_res("Error saving user")
             }
-                    Err(e) => Err(e.into()),
-                }.map_res("Error updating user")
-            }
             postgresql, sqlite {
                 let value = UserDb::to_db(self);
                 diesel::insert_into(users::table) // Insert or update