Fixed #28152 -- Made migrations serialize sets as set literals rather than set().

1 files changed, 3 insertions, 2 deletions

diff --git a/django/db/migrations/serializer.py b/django/db/migrations/serializer.py
index 9c135a5fa9..4df3776e54 100644
--- a/django/db/migrations/serializer.py
+++ b/django/db/migrations/serializer.py
@@ -244,8 +244,9 @@ class SequenceSerializer(BaseSequenceSerializer):
 
 class SetSerializer(BaseSequenceSerializer):
     def _format(self):
-        # Don't use the literal "{%s}" as it doesn't support empty set
-        return "set([%s])"
+        # Serialize as a set literal except when value is empty because {}
+        # is an empty dict.
+        return '{%s}' if self.value else 'set(%s)'
 
 
 class SettingsReferenceSerializer(BaseSerializer):