Import function through import_string function

Author: jkimbo

docs/settings.rst

@@ -153,19 +153,20 @@ Default: ``False``
 ``DJANGO_CHOICE_FIELD_ENUM_CUSTOM_NAME``
 --------------------------------------
 
-Set to a function that takes the Django choice field and returns a string to completely customise the naming for the Enum type.
+Define the path of a function that takes the Django choice field and returns a string to completely customise the naming for the Enum type.
 
 If set to a function then the ``DJANGO_CHOICE_FIELD_ENUM_V3_NAMING`` setting is ignored.
 
 Default: ``None``
 
 .. code:: python
 
+   # myapp.utils
    def enum_naming(field):
       if isinstance(field.model, User):
          return f"CustomUserEnum{field.name.title()}"
       return f"CustomEnum{field.name.title()}"
 
    GRAPHENE = {
-      'DJANGO_CHOICE_FIELD_ENUM_CUSTOM_NAME': enum_naming
+      'DJANGO_CHOICE_FIELD_ENUM_CUSTOM_NAME': "myapp.utils.enum_naming"
    }

graphene_django/converter.py

@@ -1,6 +1,7 @@
 from collections import OrderedDict
 from django.db import models
 from django.utils.encoding import force_str
+from django.utils.module_loading import import_string
 
 from graphene import (
     ID,
@@ -70,10 +71,12 @@ def description(self):
 
 
 def generate_enum_name(django_model_meta, field):
-    if graphene_settings.DJANGO_CHOICE_FIELD_ENUM_CUSTOM_NAME and callable(
-        graphene_settings.DJANGO_CHOICE_FIELD_ENUM_CUSTOM_NAME
-    ):
-        name = graphene_settings.DJANGO_CHOICE_FIELD_ENUM_CUSTOM_NAME(field)
+    if graphene_settings.DJANGO_CHOICE_FIELD_ENUM_CUSTOM_NAME:
+        # Try and import custom function
+        custom_func = import_string(
+            graphene_settings.DJANGO_CHOICE_FIELD_ENUM_CUSTOM_NAME
+        )
+        name = custom_func(field)
     elif graphene_settings.DJANGO_CHOICE_FIELD_ENUM_V3_NAMING is True:
         name = "{app_label}{object_name}{field_name}Choices".format(
             app_label=to_camel_case(django_model_meta.app_label.title()),

graphene_django/tests/test_types.py

@@ -388,6 +388,10 @@ class Meta:
     assert len(record) == 0
 
 
+def custom_enum_name(field):
+    return "CustomEnum{}".format(field.name.title())
+
+
 class TestDjangoObjectType:
     @pytest.fixture
     def PetModel(self):
@@ -532,10 +536,9 @@ class Query(ObjectType):
         graphene_settings.DJANGO_CHOICE_FIELD_ENUM_V3_NAMING = False
 
     def test_django_objecttype_choices_custom_enum_name(self, PetModel):
-        def custom_name(field):
-            return "CustomEnum{}".format(field.name.title())
-
-        graphene_settings.DJANGO_CHOICE_FIELD_ENUM_CUSTOM_NAME = custom_name
+        graphene_settings.DJANGO_CHOICE_FIELD_ENUM_CUSTOM_NAME = (
+            "graphene_django.tests.test_types.custom_enum_name"
+        )
 
         class PetModelKind(DjangoObjectType):
             class Meta:
@@ -553,14 +556,14 @@ class Query(ObjectType):
           query: Query
         }
 
-        enum DjangoModelTestsPetModelKindChoices {
+        enum CustomEnumKind {
           CAT
           DOG
         }
 
         type PetModelKind {
           id: ID!
-          kind: DjangoModelTestsPetModelKindChoices!
+          kind: CustomEnumKind!
         }
 
         type Query {