Django Rest框架Nested Serializer required = False error [英] Django Rest Framework Nested Serializer required=False error

问题描述

在DRF v3.1中，我有一个嵌套的序列化器，很像文档中详细描述的序列号 - http://www.django-rest-framework.org/api-guide/serializers/#dealing-with-nested-objects

  class SerializerA（serializers.Serializer）：
 details = DetailsS​​erializer（required = False）
 但是，当尝试使用此序列化程序并且不提供详细信息时，我收到以下内容：
  {u'details'：[你的字段可能不为空。]] 
  
鉴于文档，这看起来不正确？
 
 
 
有其他人遇到这个或可以将其验证为错误？
解决方案
好的，所以Kevin Browns的评论是正确的。我需要添加allow_null = True。
  class SerializerA（serializers.Serializer）：
 details = DetailsS​​erializer（required = False，allow_null = True）
  
这样做的原因是，require = False允许字段详细信息在构建序列化程序时不要从数据中删除。
 
 
 
 eg 
  s = SerializerA（data = {}） 
 
 
 
而allow_null允许指定参数但是为空。
 
 
 
例如
  s = SerializerA（data = {'details'：None}） 
 
 
 
问题与DRF Browsable API，但我会问另一个问题。
 
In DRF v3.1, I have a nested serializer much like the one detailed in the docs - http://www.django-rest-framework.org/api-guide/serializers/#dealing-with-nested-objects
class SerializerA(serializers.Serializer):
    details = DetailsSerializer(required=False)
However, when trying to use this serializer and not supplying the details, I receive the following:
{u'details': [u'This field may not be null.']}
This seems incorrect given the docs?

Has anyone else come across this or can verify this as a bug?
解决方案
Ok, so Kevin Browns comment is correct. I needed to add allow_null=True.
class SerializerA(serializers.Serializer):
    details = DetailsSerializer(required=False, allow_null=True)
The reason for this is that having required=False allows the field details to be absent from the data when constructing the serializer.

e.g.
s = SerializerA(data={})

whereas allow_null permits the the param to be specified but be null.

e.g. 
s = SerializerA(data={'details': None})

This opens up another issue with DRF Browsable API, but i'll ask that in a different question.

                        
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