make scheckbuch user behave as previously, but in own file

src/model/user/mod.rs

@@ -27,6 +27,7 @@ use super::{
     Day,
 };
 use crate::{tera::admin::user::UserEditForm, AMOUNT_DAYS_TO_SHOW_TRIPS_AHEAD};
+use scheckbuch::ScheckbuchUser;
 
 mod fee;
 mod scheckbuch;
@@ -112,6 +113,8 @@ impl User {
                 .await?;
         } else if self.has_role(db, "schnupperant").await {
             self.send_welcome_mail_schnupper(db, mail, smtp_pw).await?;
+        } else if let Some(scheckbuch) = ScheckbuchUser::new(db, &self).await {
+            scheckbuch.notify(db, mail, smtp_pw).await?;
         } else {
             return Err(format!(
                 "Could not send welcome mail, because user {} is not in Donau Linz or scheckbuch or schnupperant group",
@@ -259,7 +262,7 @@ ASKÖ Ruderverein Donau Linz", self.name),
     }
 
     pub async fn allowed_to_update_always_show_trip(&self, db: &SqlitePool) -> bool {
-        AllowedToUpdateTripToAlwaysBeShownUser::new(db, self.clone())
+        AllowedToUpdateTripToAlwaysBeShownUser::new(db, &self)
             .await
             .is_some()
     }
@@ -989,9 +992,9 @@ macro_rules! special_user {
         }
 
         impl $name {
-            pub async fn new(db: &SqlitePool, user: User) -> Option<Self> {
+            pub async fn new(db: &SqlitePool, user: &User) -> Option<Self> {
                 if special_user!(@check_roles user, db, $($role)*) {
-                    Some($name { user })
+                    Some($name { user: user.clone() })
                 } else {
                     None
                 }

src/model/user/scheckbuch.rs

@@ -30,16 +30,23 @@ impl ScheckbuchUser {
         user.add_role(db, &scheckbuch).await.unwrap();
 
         // TODO: remove all other `membership_type` roles
+        let new_user = Self::new(db, &user).await.unwrap();
 
-        let new_user = Self::new(db, user).await.unwrap();
+        new_user.notify(db, mail, smtp_pw).await
+    }
 
-        new_user
-            .send_welcome_mail_to_user(db, mail, smtp_pw)
-            .await?;
-        new_user.notify_coxes_about_new_scheckbuch(db).await;
+    pub(crate) async fn notify(
+        &self,
+        db: &SqlitePool,
+        mail: &str,
+        smtp_pw: &str,
+    ) -> Result<(), String> {
+        self.send_welcome_mail_to_user(db, mail, smtp_pw).await?;
+        self.notify_coxes_about_new_scheckbuch(db).await;
 
         Ok(())
     }
+
     async fn send_welcome_mail_to_user(
         &self,
         db: &SqlitePool,