将PostImage的OneToOneField改为ForeignKey后触发AttributeError问题

我把PostImage模型中的OneToOneField字段修改为ForeignKey后，出现了如下错误：
AttributeError: 'ManyToOneRel' object has no attribute 'attname'

修改后的模型代码 #

class PostImage(models.Model):
# post = models.OneToOneField(Post, on_delete=models.CASCADE, related_name='image', null=True)
post = models.ForeignKey(Post, on_delete=models.CASCADE, related_name='image', null=True)
image = ProcessedImageField(verbose_name=_('image'), storage=post_image_storage,
                            upload_to=upload_to_post_image_directory,
                            width_field='width',
                            height_field='height',
                            blank=False, null=True, format='JPEG', options={'quality': 80},

Docker Compose错误日志 #

my-api        | Traceback (most recent call last):
my-api        |   File "/usr/local/lib/python3.8/site-packages/django/core/handlers/exception.py", line 47, in inner
my-api        |     response = get_response(request)
my-api        |   File "/usr/local/lib/python3.8/site-packages/django/core/handlers/base.py", line 181, in _get_response
my-api        |     response = wrapped_callback(request, *callback_args, **callback_kwargs)
my-api        |   File "/usr/local/lib/python3.8/site-packages/django/views/decorators/csrf.py", line 54, in wrapped_view
my-api        |     return view_func(*args, **kwargs)
my-api        |   File "/usr/local/lib/python3.8/site-packages/django/views/generic/base.py", line 70, in view
my-api        |     return self.dispatch(request, *args, **kwargs)
my-api        |   File "/usr/local/lib/python3.8/site-packages/rest_framework/views.py", line 509, in dispatch
my-api        |     response = self.handle_exception(exc)
my-api        |   File "/usr/local/lib/python3.8/site-packages/rest_framework/views.py", line 469, in handle_exception
my-api        |     self.raise_uncaught_exception(exc)
my-api        |   File "/usr/local/lib/python3.8/site-packages/rest_framework/views.py", line 480, in raise_uncaught_exception
my-api        |     raise exc
my-api        |   File "/usr/local/lib/python3.8/site-packages/rest_framework/views.py", line 506, in dispatch
my-api        |     response = handler(request, *args, **kwargs)
my-api        |   File "/opt/my-api-core/my_posts/views/posts/views.py", line 55, in get
my-api        |     return self.get_posts_for_authenticated_user(request)
my-api        |   File "/opt/my-api-core/my_posts/views/posts/views.py", line 92, in get_posts_for_authenticated_user
my-api        |     post_serializer_data = AuthenticatedUserPostSerializer(posts, many=True, context={"request": request}).data
my-api        |   File "/usr/local/lib/python3.8/site-packages/rest_framework/serializers.py", line 768, in data
my-api        |     ret = super().data
my-api        |   File "/usr/local/lib/python3.8/site-packages/rest_framework/serializers.py", line 253, in data
my-api        |     self._data = self.to_representation(self.instance)
my-api        |   File "/usr/local/lib/python3.8/site-packages/rest_framework/serializers.py", line 686, in to_representation
my-api        |     return [
my-api        |   File "/usr/local/lib/python3.8/site-packages/django/db/models/query.py", line 280, in __iter__
my-api        |     self._fetch_all()
my-api        |   File "/usr/local/lib/python3.8/site-packages/cacheops/query.py", line 273, in _fetch_all
my-api        |     return self._no_monkey._fetch_all(self)
my-api        |   File "/usr/local/lib/python3.8/site-packages/django/db/models/query.py", line 1324, in _fetch_all
my-api        |     self._result_cache = list(self._iterable_class(self))
my-api        |   File "/usr/local/lib/python3.8/site-packages/django/db/models/query.py", line 51, in __iter__
my-api        |     results = compiler.execute_sql(chunked_fetch=self.chunked_fetch, chunk_size=self.chunk_size)
my-api        |   File "/usr/local/lib/python3.8/site-packages/django/db/models/sql/compiler.py", line 1156, in execute_sql
my-api        |     sql, params = self.as_sql()
my-api        |   File "/usr/local/lib/python3.8/site-packages/django/db/models/sql/compiler.py", line 507, in as_sql
my-api        |     extra_select, order_by, group_by = self.pre_sql_setup()
my-api        |   File "/usr/local/lib/python3.8/site-packages/django/db/models/sql/compiler.py", line 55, in pre_sql_setup
my-api        |     self.setup_query()
my-api        |   File "/usr/local/lib/python3.8/site-packages/django/db/models/sql/compiler.py", line 46, in setup_query
my-api        |     self.select, self.klass_info, self.annotation_col_map = self.get_select()
my-api        |   File "/usr/local/lib/python3.8/site-packages/django/db/models/sql/compiler.py", line 227, in get_select
my-api        |     cols = self.get_default_columns()
my-api        |   File "/usr/local/lib/python3.8/site-packages/django/db/models/sql/compiler.py", line 671, in get_default_columns
my-api        |     only_load = self.deferred_to_columns()
my-api        |   File "/usr/local/lib/python3.8/site-packages/django/db/models/sql/compiler.py", line 1096, in deferred_to_columns
my-api        |     self.query.deferred_to_data(columns, self.query.get_loaded_field_names_cb)
my-api        |   File "/usr/local/lib/python3.8/site-packages/django/db/models/sql/query.py", line 754, in deferred_to_data
my-api        |     callback(target, model, values)
my-api        |   File "/usr/local/lib/python3.8/site-packages/django/db/models/sql/query.py", line 2179, in get_loaded_field_names_cb
my-api        |     target[model] = {f.attname for f in fields}
my-api        |   File "/usr/local/lib/python3.8/site-packages/django/db/models/sql/query.py", line 2179, in <setcomp>
my-api        |     target[model] = {f.attname for f in fields}
my-api        | AttributeError: 'ManyToOneRel' object has no attribute 'attname'
django.server ERROR    "GET /api/posts/?count=10& HTTP/1.1" 500 195670

出错的视图函数代码 #

def get_posts_for_authenticated_user(self, request):
        query_params = request.query_params.dict()
        normalize_list_value_in_request_data('circle_id', query_params)
        normalize_list_value_in_request_data('list_id', query_params)

        serializer = GetPostsSerializer(data=query_params)
        serializer.is_valid(raise_exception=True)
        data = serializer.validated_data

        circles_ids = data.get('circle_id')
        lists_ids = data.get('list_id')
        max_id = data.get('max_id')
        min_id = data.get('min_id')
        count = data.get('count', 10)
        username = data.get('username')

        user = request.user

        if username:
            if username == user.username:
                posts = user.get_posts(max_id=max_id)
            else:
                posts = user.get_posts_for_user_with_username(username, max_id=max_id, min_id=min_id)
        else:
            posts = user.get_timeline_posts(
                circles_ids=circles_ids,
                lists_ids=lists_ids,
                max_id=max_id,
                min_id=min_id,
                count=count
            )

        posts = posts.order_by('-id')[:count]

        post_serializer_data = AuthenticatedUserPostSerializer(posts, many=True, context={"request": request}).data

        return Response(post_serializer_data, status=status.HTTP_200_OK)

已尝试的解决方法 #

• 将order_by从posts = posts.order_by('-id')[:count]改为posts = posts.order_by('-created')[:count]，错误依旧。
• 使用flush命令清空数据库并重建Docker容器，问题仍未解决。

内容的提问来源于stack exchange，提问作者Ananth