refactor: centralize alarm dict-to-GraphQL mapping

api/schema.py

@@ -68,6 +68,15 @@ class Alarm:
     is_enabled: bool
 
 
+def _alarm_from_dict(data: dict) -> Alarm:
+    """Map a CrontabManager alarm dict to the public GraphQL Alarm type."""
+    return Alarm(
+        id=data["id"],
+        cron_expression=data["cron_expression"],
+        is_enabled=data["is_enabled"],
+    )
+
+
 @strawberry.type
 class Query:
     @strawberry.field
@@ -77,26 +86,14 @@ class Query:
     @strawberry.field
     def get_alarms(self) -> List[Alarm]:
         manager = get_manager()
-        return [
-            Alarm(
-                id=a["id"],
-                cron_expression=a["cron_expression"],
-                is_enabled=a["is_enabled"],
-            )
-            for a in manager.get_alarms()
-        ]
+        return [_alarm_from_dict(a) for a in manager.get_alarms()]
 
     @strawberry.field
     def get_alarm(self, id: str) -> Optional[Alarm]:
         manager = get_manager()
-        alarms = manager.get_alarms()
-        for a in alarms:
+        for a in manager.get_alarms():
             if a["id"] == id:
-                return Alarm(
-                    id=a["id"],
-                    cron_expression=a["cron_expression"],
-                    is_enabled=a["is_enabled"],
-                )
+                return _alarm_from_dict(a)
         return None