Update mutation.py to serialize Enum objects into input values (#1431)

* Fix for issue #1385: Update mutation.py to serialize Enum objects into input values for ChoiceFields

* Update graphene_django/rest_framework/mutation.py

Co-authored-by: Steven DeMartini <[email protected]>

---------

Co-authored-by: Steven DeMartini <[email protected]>

Author: allen-munsch

Diff for: graphene_django/rest_framework/models.py

@@ -14,3 +14,14 @@ class MyFakeModelWithPassword(models.Model):
 class MyFakeModelWithDate(models.Model):
     cool_name = models.CharField(max_length=50)
     last_edited = models.DateField()
+
+
+class MyFakeModelWithChoiceField(models.Model):
+    class ChoiceType(models.Choices):
+        ASDF = "asdf"
+        HI = "hi"
+
+    choice_type = models.CharField(
+        max_length=4,
+        default=ChoiceType.HI.name,
+    )

Diff for: graphene_django/rest_framework/mutation.py

@@ -1,3 +1,5 @@
+from enum import Enum
+
 from collections import OrderedDict
 
 from django.shortcuts import get_object_or_404
@@ -124,8 +126,10 @@ def __init_subclass_with_meta__(
     def get_serializer_kwargs(cls, root, info, **input):
         lookup_field = cls._meta.lookup_field
         model_class = cls._meta.model_class
-
         if model_class:
+            for input_dict_key, maybe_enum in input.items():
+                if isinstance(maybe_enum, Enum):
+                    input[input_dict_key] = maybe_enum.value
             if "update" in cls._meta.model_operations and lookup_field in input:
                 instance = get_object_or_404(
                     model_class, **{lookup_field: input[lookup_field]}

Diff for: graphene_django/rest_framework/tests/test_mutation.py

@@ -7,7 +7,12 @@
 from graphene.types.inputobjecttype import InputObjectType
 
 from ...types import DjangoObjectType
-from ..models import MyFakeModel, MyFakeModelWithDate, MyFakeModelWithPassword
+from ..models import (
+    MyFakeModel,
+    MyFakeModelWithDate,
+    MyFakeModelWithPassword,
+    MyFakeModelWithChoiceField,
+)
 from ..mutation import SerializerMutation
 
 
@@ -268,6 +273,39 @@ class Meta:
     assert result.days_since_last_edit == 4
 
 
+def test_perform_mutate_success_with_enum_choice_field():
+    class ListViewChoiceFieldSerializer(serializers.ModelSerializer):
+        choice_type = serializers.ChoiceField(
+            choices=[(x.name, x.value) for x in MyFakeModelWithChoiceField.ChoiceType],
+            required=False,
+        )
+
+        class Meta:
+            model = MyFakeModelWithChoiceField
+            fields = "__all__"
+
+    class SomeCreateSerializerMutation(SerializerMutation):
+        class Meta:
+            serializer_class = ListViewChoiceFieldSerializer
+
+    choice_type = {
+        "choice_type": SomeCreateSerializerMutation.Input.choice_type.type.get("ASDF")
+    }
+    name = MyFakeModelWithChoiceField.ChoiceType.ASDF.name
+    result = SomeCreateSerializerMutation.mutate_and_get_payload(
+        None, mock_info(), **choice_type
+    )
+    assert result.errors is None
+    assert result.choice_type == name
+    kwargs = SomeCreateSerializerMutation.get_serializer_kwargs(
+        None, mock_info(), **choice_type
+    )
+    assert kwargs["data"]["choice_type"] == name
+    assert 1 == MyFakeModelWithChoiceField.objects.count()
+    item = MyFakeModelWithChoiceField.objects.first()
+    assert item.choice_type == name
+
+
 def test_mutate_and_get_payload_error():
     class MyMutation(SerializerMutation):
         class Meta: