Allows field's choices to be a callable (#1497)

* Allows field's choices to be a callable

Starting in Django 5 field's choices can also be a callable

* test if field with callable choices converts into enum

---------

Co-authored-by: Kien Dang <mail@kien.ai>

graphene_django/converter.py

@@ -1,4 +1,5 @@
 import inspect
+from collections.abc import Callable
 from functools import partial, singledispatch, wraps
 
 from django.db import models
@@ -71,6 +72,8 @@ def convert_choice_name(name):
 
 def get_choices(choices):
     converted_names = []
+    if isinstance(choices, Callable):
+        choices = choices()
 
     # In restframework==3.15.0, choices are not passed
     # as OrderedDict anymore, so it's safer to check

graphene_django/tests/test_converter.py

@@ -180,6 +180,26 @@ def test_field_with_choices_convert_enum():
     assert graphene_type._meta.enum.__members__["EN"].description == "English"
 
 
+def test_field_with_callable_choices_convert_enum():
+    def get_choices():
+        return ("es", "Spanish"), ("en", "English")
+
+    field = models.CharField(help_text="Language", choices=get_choices)
+
+    class TranslatedModel(models.Model):
+        language = field
+
+        class Meta:
+            app_label = "test"
+
+    graphene_type = convert_django_field_with_choices(field).type.of_type
+    assert graphene_type._meta.name == "TestTranslatedModelLanguageChoices"
+    assert graphene_type._meta.enum.__members__["ES"].value == "es"
+    assert graphene_type._meta.enum.__members__["ES"].description == "Spanish"
+    assert graphene_type._meta.enum.__members__["EN"].value == "en"
+    assert graphene_type._meta.enum.__members__["EN"].description == "English"
+
+
 def test_field_with_grouped_choices():
     field = models.CharField(
         help_text="Language",