Create admin function to use copy-pasted users from ekey, return the ones which don't match to "Donau Linz" rowt user, Fixes #204 (#230)

Reviewed-on: #230

src/model/role.rs

@@ -45,6 +45,19 @@ WHERE name like ?
         .ok()
     }
 
+    pub async fn names_from_role(&self, db: &SqlitePool) -> Vec<String> {
+        let query = format!(
+            "SELECT u.name
+         FROM user u
+         JOIN user_role ur ON u.id = ur.user_id
+         JOIN role r ON ur.role_id = r.id
+         WHERE r.id = {} AND deleted=0;",
+            self.id
+        );
+
+        sqlx::query_scalar(&query).fetch_all(db).await.unwrap()
+    }
+
     pub async fn mails_from_role(&self, db: &SqlitePool) -> Vec<String> {
         let query = format!(
             "SELECT u.mail