我有一个Object带有state日期时间参数的方法的类dt。如何将日期时间参数从 URL 传递到Object.state()？
该模型：
class Object(models.Model):
def state(self, dt=datetime.datetime.now()) -> dict:
...stuff...
return {'dt': dt, 'other_stuff': stuff}
风景：
class ObjectDetail(generics.RetrieveAPIView):
queryset = models.Object.objects.all()
serializer_class = serializers.ObjectSerializer
def get_serializer_context(self):
return {'dt': self.request.query_params.get('dt', datetime.datetime.now())}
def get(self, request, *args, **kwargs):
return self.retrieve(request, *args, **kwargs)
和序列化器类：
class ObjectSerializer(serializers.HyperlinkedModelSerializer):
state = StateSerializer(read_only=True, context={'dt': self.context['dt']})
class Meta:
model = models.Object
fields = ('state')
class StateSerializer(serializers.Serializer):
dt = serializers.DateTimeField()
... other stuff...
如您所见，我试图在视图中较早设置上下文dt的行state = StateSerializer(read_only=True, context={'dt': dt})中作为额外上下文传递。这里的问题是无法通过as未定义访问何时ObjectSerializer初始化。dtself.context['dt']self
解决办法是先做state一个serializers.SerializerMethodField()，然后再定义一个get_state方法。新的ObjectSeializer看起来像这样：
class ObjectSerializer(serializers.HyperlinkedModelSerializer):
state = serializers.SerializerMethodField()
class Meta:
model = models.Object
fields = ('state')
def get_state(self, obj):
state = obj.state(self.context['dt'])
state_serializer = StateSerializer(state)
return state_serializer.data
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