Add support for MultipleChoiceField

Author: patrick91

graphene_django/rest_framework/serializer_converter.py

@@ -91,3 +91,8 @@ def convert_serializer_field_to_dict(field):
 @get_graphene_type_from_serializer_field.register(serializers.JSONField)
 def convert_serializer_field_to_jsonstring(field):
     return graphene.types.json.JSONString
+
+
+@get_graphene_type_from_serializer_field.register(serializers.MultipleChoiceField)
+def convert_serializer_field_to_list_of_string(field):
+    return (graphene.List, graphene.String)

graphene_django/rest_framework/tests/test_field_converter.py

@@ -144,3 +144,9 @@ def test_should_image_convert_string():
 
 def test_should_json_convert_jsonstring():
     assert_conversion(serializers.JSONField, graphene.types.json.JSONString)
+
+
+def test_should_multiplechoicefield_convert_to_list_of_string():
+    field = assert_conversion(serializers.MultipleChoiceField, graphene.List, choices=[1,2,3])
+
+    assert field.of_type == graphene.String