Support QueryDict list arguments with ListField. Closes #3155.

docs/api-guide/renderers.md

@@ -157,7 +157,7 @@ See also: `TemplateHTMLRenderer`
 
 Renders data returned by a serializer into an HTML form.  The output of this renderer does not include the enclosing `<form>` tags or an submit actions, as you'll probably need those to include the desired method and URL.  Also note that the `HTMLFormRenderer` does not yet support including field error messages.
 
-**Note**: The `HTMLFormRenderer` class is intended for internal use with the browsable API. It should not be considered stable API. The template used by the `HTMLFormRenderer` class, and the context submitted to it **may be subject to change**.  If you need to use this renderer class it is advised that you either make a local copy of the class and templates, or follow the release note on REST framework upgrades closely.
+**Note**: The `HTMLFormRenderer` class is intended for internal use with the browsable API. It should not be considered a fully documented or stable API. The template used by the `HTMLFormRenderer` class, and the context submitted to it **may be subject to change**.  If you need to use this renderer class it is advised that you either make a local copy of the class and templates, or follow the release note on REST framework upgrades closely.
 
 **.media_type**: `text/html`
 

rest_framework/fields.py

@@ -1285,6 +1285,10 @@ class ListField(Field):
         # We override the default field access in order to support
         # lists in HTML forms.
         if html.is_html_input(dictionary):
+            val = dictionary.getlist(self.field_name, [])
+            if len(val) > 1:
+                # Support QueryDict lists in HTML input.
+                return val
             return html.parse_html_list(dictionary, prefix=self.field_name)
         return dictionary.get(self.field_name, empty)
 

tests/test_fields.py

@@ -308,6 +308,14 @@ class TestHTMLInput:
         assert serializer.is_valid()
         assert serializer.validated_data == {}
 
+    def test_querydict_list_input(self):
+        class TestSerializer(serializers.Serializer):
+            scores = serializers.ListField(child=serializers.IntegerField())
+
+        serializer = TestSerializer(data=QueryDict('scores=1&scores=3'))
+        assert serializer.is_valid()
+        assert serializer.validated_data == {'scores': [1, 3]}
+
 
 class TestCreateOnlyDefault:
     def setup(self):