Convert assignees listing from dicts to strings

move_issue.py

@@ -34,6 +34,16 @@ def move_issue(source_owner, source_repo, issue_number, destination_owner, desti
         print(f"We have removed the milestone {milestone['title']} from this issue (milestones are specific to repositories).")
         # Note that pop has already thrown out the milestone from json_response
 
+    assignees = json_response.pop('assignees', {})
+    if assignees:
+        # 'assignee' is deprecated; remove it.
+        json_response.pop('assignee', None)
+        # Forgejo's API *gives* us assignee objects but only *accepts* strings.
+        # Specifically, we need to replace the dict with its 'login' key.
+        json_response['assignees'] = []
+        for assignee in assignees:
+            json_response['assignees'].append(assignee['login'])
+
     print(f"Creating issue {json_response['title']} now…")
 
     create_issue_url = API_CREATE_ISSUE.format(instance=FORGEJO_INSTANCE, owner=destination_owner, repo=destination_repo)