當兩個串行類聲明具有相同名稱的SerializerMethodField，像這樣：Django的REST框架SerializerMethodField怪異行爲
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')
代碼
serializer = APIProfileSerializer(instance=request.user, request=request)
return Response(data=serializer.data)
崩潰，並顯示以下追蹤：
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'
（我的第一個問題是：如何使痕跡更容易在減價中讀取？ =））
這就像request尚未傳遞到序列化器
然而，這
serializer = ProfileSerializer(instance=request.user, request=request)
return Response(data=serializer.data)
這
serializer = APIProfileSerializer(instance=request.user,request=request)
_data = serializer.data,
return Response(data=_data)
做工精細...
調試顯示調用了APIProfileSerializer和ProfileSerializer，並且致命get_image在ProfileSerializer沒有通過request它
因此，問題是：WTF ?!我沒有叫這個序列化器！我從來沒有在我的意見中提及它！如何和爲什麼被稱爲？
我堅持用後面的代碼來解決這個問題，但是這裏有一個更好的方法！有什麼建議麼？