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Fix error when using typing classes #195

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Fix error when using typing classes #195

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3 changes: 3 additions & 0 deletions src/drf_yasg/inspectors/field.py
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,7 @@
import uuid
from collections import OrderedDict
from decimal import Decimal
from inspect import isclass

from django.core import validators
from django.db import models
Expand Down Expand Up @@ -511,6 +512,8 @@ def field_to_swagger_object(self, field, swagger_object_type, use_references, **
# look for Python 3.5+ style type hinting of the return value
hint_class = inspect.signature(method).return_annotation

if not isclass(hint_class) and hasattr(hint_class, '__args__'):
hint_class = hint_class.__args__[0]
if not issubclass(hint_class, inspect._empty):
type_info = get_basic_type_info_from_hint(hint_class)

Expand Down