feat(poll): reorder options without invalidating answers

src/govoplan_poll/backend/capabilities.py

@@ -11,6 +11,7 @@ from govoplan_core.core.poll import (
     PollCreateCommand,
     PollInvitationCommand,
     PollInvitationRef,
+    PollOptionOrderCommand,
     PollOptionRequest,
     PollOptionRef,
     PollOptionUpdateCommand,
@@ -70,6 +71,7 @@ from govoplan_poll.backend.service import (
     poll_result_summary_by_id,
     response_datetime,
     remove_poll_option,
+    reorder_poll_options,
     revoke_poll_invitation_with_replay,
     set_poll_workflow_context,
     submit_poll_response,
@@ -82,7 +84,13 @@ def _poll_ref(poll: object) -> PollRef:
     return PollRef(
         id=poll.id,
         status=poll.status,
-        options=tuple(PollOptionRef(id=option.id, position=option.position) for option in poll.options),
+        options=tuple(
+            PollOptionRef(id=option.id, position=option.position)
+            for option in sorted(
+                (option for option in poll.options if option.deleted_at is None),
+                key=lambda item: (item.position, item.id),
+            )
+        ),
     )
 
 
@@ -610,6 +618,31 @@ class SqlPollSchedulingProvider(PollSchedulingProvider):
             raise PollCapabilityError(str(exc)) from exc
         return PollOptionRef(id=option.id, position=option.position)
 
+    def reorder_options(
+        self,
+        session: object,
+        *,
+        tenant_id: str,
+        poll_id: str,
+        command: PollOptionOrderCommand,
+    ) -> PollRef:
+        try:
+            mutation_owner = _stored_owner(
+                session,
+                tenant_id=tenant_id,
+                poll_id=poll_id,
+            )
+            poll = reorder_poll_options(
+                session,
+                tenant_id=tenant_id,
+                poll_id=poll_id,
+                option_ids=command.option_ids,
+                mutation_owner=mutation_owner,
+            )
+        except PollError as exc:
+            raise PollCapabilityError(str(exc)) from exc
+        return _poll_ref(poll)
+
     def open_poll(self, session: object, *, tenant_id: str, poll_id: str) -> PollRef:
         return self._transition(open_poll, session, tenant_id=tenant_id, poll_id=poll_id)