Use the filenames of the contestant as a default submission comment

It is very useful for the scientific commitee to see it in the Comment column of the submissions page in the admin website. This column was mostly unused and empty in the past.

Author: niklaci

cms/server/contest/submission/workflow.py

@@ -220,11 +220,15 @@ def accept_submission(
     logger.info("All files stored for submission sent by %s",
                 participation.user.username)
 
+    # Use the filenames of the contestant as a default submission comment
+    received_filenames_joined = ",".join([file.filename for file in received_files])
+
     submission = Submission(
         timestamp=timestamp,
         language=language.name if language is not None else None,
         task=task,
         participation=participation,
+        comment=received_filenames_joined,
         official=official)
     sql_session.add(submission)
 

cmstestsuite/unit_tests/server/contest/submission/workflow_test.py

@@ -83,7 +83,7 @@ def setUp(self):
         self.tornado_files = sentinel.tornado_files
         self.language_name = sentinel.language_name
         self.official = True
-        self.received_files = sentinel.received_files
+        self.received_files = []
         self.files = {"foo.%l": FOO_CONTENT}
         # Multiple extensions, primary one doesn't start with a period.
         self.language = make_language("MockLanguage", ["mock.1", ".mock2"])