diff options
Diffstat (limited to 'django/core/serializers/python.py')
| -rw-r--r-- | django/core/serializers/python.py | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/django/core/serializers/python.py b/django/core/serializers/python.py index a3918bf9d2..fa3bce2948 100644 --- a/django/core/serializers/python.py +++ b/django/core/serializers/python.py @@ -70,14 +70,20 @@ class Serializer(base.Serializer): def m2m_value(value): return value.natural_key() + def queryset_iterator(obj, field): + return getattr(obj, field.name).iterator() + else: def m2m_value(value): return self._value_from_field(value, value._meta.pk) + def queryset_iterator(obj, field): + return getattr(obj, field.name).only("pk").iterator() + m2m_iter = getattr(obj, "_prefetched_objects_cache", {}).get( field.name, - getattr(obj, field.name).iterator(), + queryset_iterator(obj, field), ) self._current[field.name] = [m2m_value(related) for related in m2m_iter] |