drf serializer获取viewset 中的上下文context,自定义上下文

drf serializer获取viewset 中的上下文context,自定义上下文

源码分析:

从​​BaseSerializer​​中:

class BaseSerializer(Field): """ The BaseSerializer class provides a minimal class which may be used for writing custom serializer implementations. Note that we strongly restrict the ordering of operations/properties that may be used on the serializer in order to enforce correct usage. In particular, if a `data=` argument is passed then: .is_valid() - Available. .initial_data - Available. .validated_data - Only available after calling `is_valid()` .errors - Only available after calling `is_valid()` .data - Only available after calling `is_valid()` If a `data=` argument is not passed then: .is_valid() - Not available. .initial_data - Not available. .validated_data - Not available. .errors - Not available. .data - Available. """ def __init__(self, instance=None, data=empty, **kwargs): self.instance = instance if data is not empty: self.initial_data = data self.partial = kwargs.pop('partial', False) self._context = kwargs.pop('context', {}) # 传递上下文参数 kwargs.pop('many', None) super(BaseSerializer, self).__init__(**kwargs)

在viewset中是怎样自动传递上下文的的:

class GenericAPIView(views.APIView): def get_serializer(self, *args, **kwargs): """ Return the serializer instance that should be used for validating and deserializing input, and for serializing output. """ serializer_class = self.get_serializer_class() kwargs['context'] = self.get_serializer_context() return serializer_class(*args, **kwargs) def get_serializer_class(self): """ Return the class to use for the serializer. Defaults to using `self.serializer_class`. You may want to override this if you need to provide different serializations depending on the incoming request. (Eg. admins get full serialization, others get basic serialization) """ assert self.serializer_class is not None, ( "'%s' should either include a `serializer_class` attribute, " "or override the `get_serializer_class()` method." % self.__class__.__name__ ) return self.serializer_class #这里设置了上下文 def get_serializer_context(self): """ Extra context provided to the serializer class. """ return { 'request': self.request, 'format': self.format_kwarg, 'view': self }

所以如果要自定以上下文的的值,可以重写​​get_serializer_context​​方法.

懂得,原来世界如此简单!

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