enable changing paid state

src/model/role.rs

@@ -3,8 +3,8 @@ use sqlx::{FromRow, SqlitePool};
 
 #[derive(FromRow, Serialize, Clone)]
 pub struct Role {
-    id: i64,
-    name: String,
+    pub(crate) id: i64,
+    pub(crate) name: String,
 }
 
 impl Role {
@@ -30,6 +30,21 @@ WHERE id like ?
         .ok()
     }
 
+    pub async fn find_by_name(db: &SqlitePool, name: &str) -> Option<Self> {
+        sqlx::query_as!(
+            Self,
+            "
+SELECT id, name
+FROM role 
+WHERE name like ?
+        ",
+            name
+        )
+        .fetch_one(db)
+        .await
+        .ok()
+    }
+
     pub async fn mails_from_role(&self, db: &SqlitePool) -> Vec<String> {
         let query = format!(
             "SELECT u.mail