django rest framework SerializerMethodField bizarre behaviour
当两个序列化程序类声明具有相同名称的SerializerMethodField时，如下所示：
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 | class APIProfileSerializer(serializers.ModelSerializer): def __init__(self, *args, **kwargs): super(APIProfileSerializer, self).__init__(*args, **kwargs) self.request = request def get_image(self, instance): if instance.image: return self.request.build_absolute_uri(location=instance.image.url) return None image = serializers.SerializerMethodField() # other ProfileSerializer fields class Meta: model = User fields = ('image') class ProfileSerializer(serializers.ModelSerializer): def __init__(self, *args, **kwargs): super(ProfileSerializer, self).__init__(*args, **kwargs) self.request = request def get_image(self, instance): if instance.image: return self.request.build_absolute_uri(location=instance.image.url) return None image = serializers.SerializerMethodField() # other ProfileSerializer fields class Meta: model = User fields = ('image') |
代码
1 2 | serializer = APIProfileSerializer(instance=request.user, request=request) return Response(data=serializer.data) |
号
具有以下回溯的崩溃：
Traceback (most recent call last):
File"/home/ubuntu/venv/superhq_rest/lib/python3.4/site-packages/django/core/handlers/base.py", line 174, in get_response
response = self.process_exception_by_middleware(e, request)
File"/home/ubuntu/venv/superhq_rest/lib/python3.4/site-packages/django/core/handlers/base.py", line 172, in get_response
response = response.render()
File"/home/ubuntu/venv/superhq_rest/lib/python3.4/site-packages/django/template/response.py", line 160, in render
self.content = self.rendered_content
File"/home/ubuntu/venv/superhq_rest/lib/python3.4/site-packages/rest_framework/response.py", line 71, in rendered_content
ret = renderer.render(self.data, media_type, context)
File"/home/ubuntu/venv/superhq_rest/lib/python3.4/site-packages/rest_framework/renderers.py", line 675, in render
context = self.get_context(data, accepted_media_type, renderer_context)
File"/home/ubuntu/venv/superhq_rest/lib/python3.4/site-packages/rest_framework/renderers.py", line 618, in get_context
raw_data_put_form = self.get_raw_data_form(data, view, 'PUT', request)
File"/home/ubuntu/venv/superhq_rest/lib/python3.4/site-packages/rest_framework/renderers.py", line 540, in get_raw_data_form
content = renderer.render(serializer.data, accepted, context)
File"/home/ubuntu/venv/superhq_rest/lib/python3.4/site-packages/rest_framework/serializers.py", line 503, in data
ret = super(Serializer, self).data
File"/home/ubuntu/venv/superhq_rest/lib/python3.4/site-packages/rest_framework/serializers.py", line 239, in data
self._data = self.to_representation(self.instance)
File"/home/ubuntu/venv/superhq_rest/lib/python3.4/site-packages/rest_framework/serializers.py", line 472, in to_representation
ret[field.field_name] = field.to_representation(attribute)
File"/home/ubuntu/venv/superhq_rest/lib/python3.4/site-packages/rest_framework/fields.py", line 1645, in to_representation
return method(value)
File"/home/ubuntu/vhosts/superhq_backend/account/serializers.py", line 32, in get_image
return self.request.build_absolute_uri(location=instance.image.url)
AttributeError: 'NoneType' object has no attribute 'build_absolute_uri'
号
(我的第一个问题是：如何使回溯在标记中更具可读性？=)
就像EDOCX1[0]没有传递给序列化程序
然而，这
1 2 | serializer = ProfileSerializer(instance=request.user, request=request) return Response(data=serializer.data) |
还有这个
1 2 3 | serializer = APIProfileSerializer(instance=request.user,request=request) _data = serializer.data, return Response(data=_data) |
。
工作正常…
调试表明，调用了apiProfileSerializer和profileSerializer，导致崩溃的原因是在
所以，问题是：世贸组织？！我没有调用这个序列化程序！我从来没有在我的观点中提到过！它是如何被称为什么原因的？
我坚持使用后一段代码来解决这个问题，但必须有更好的方法！有什么建议吗？
我有点像这样解决了它：
改变
1 | if instance.image: |
到
1 | if instance.image and self.request: |
号
因此，这些在引擎盖下的
尽管如此，知道为什么会发生上述所有事情还是很好的。
如果