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-rw-r--r--django/forms/models.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/django/forms/models.py b/django/forms/models.py
index 11fe0c09ea..e9b71ccf26 100644
--- a/django/forms/models.py
+++ b/django/forms/models.py
@@ -126,7 +126,7 @@ def model_to_dict(instance, fields=None, exclude=None):
data[f.name] = []
else:
# MultipleChoiceWidget needs a list of pks, not object instances.
- data[f.name] = [obj.pk for obj in f.value_from_object(instance)]
+ data[f.name] = list(f.value_from_object(instance).values_list('pk', flat=True))
else:
data[f.name] = f.value_from_object(instance)
return data