diff --git a/django/forms/widgets.py b/django/forms/widgets.py
index 784ccda159..0a5059a9c2 100644
--- a/django/forms/widgets.py
+++ b/django/forms/widgets.py
@@ -840,6 +840,11 @@ class MultiWidget(Widget):
obj.widgets = copy.deepcopy(self.widgets)
return obj
+ @property
+ def needs_multipart_form(self):
+ return any(w.needs_multipart_form for w in self.widgets)
+
+
class SplitDateTimeWidget(MultiWidget):
"""
A Widget that splits datetime input into two boxes.
diff --git a/tests/forms_tests/tests/test_widgets.py b/tests/forms_tests/tests/test_widgets.py
index 4c566dc8e4..06ee2d6c53 100644
--- a/tests/forms_tests/tests/test_widgets.py
+++ b/tests/forms_tests/tests/test_widgets.py
@@ -849,6 +849,14 @@ beatle J R Ringo False""")
w = MyMultiWidget(widgets=(TextInput(attrs={'class': 'big'}), TextInput(attrs={'class': 'small'})), attrs={'id': 'bar'})
self.assertHTMLEqual(w.render('name', ['john', 'lennon']), '
')
+ # Test needs_multipart_form=True if any widget needs it
+ w = MyMultiWidget(widgets=(TextInput(), FileInput()))
+ self.assertTrue(w.needs_multipart_form)
+
+ # Test needs_multipart_form=False if no widget needs it
+ w = MyMultiWidget(widgets=(TextInput(), TextInput()))
+ self.assertFalse(w.needs_multipart_form)
+
def test_splitdatetime(self):
w = SplitDateTimeWidget()
self.assertHTMLEqual(w.render('date', ''), '')