Django Rest Framework ModelSerializer字段不符合required=False

使用django rest framework 3.1.1，我有以下序列化程序：

class CommentSerializer(ContentSerializer):

    created_by = UserSerializer(required=False)
    content = serializers.PrimaryKeyRelatedField(queryset=Content.objects.all(), required=False)

    class Meta:
        model = Comment

{"created_by":{"username":["This field is required."],"user_permissions":["This field is required."],"password":["This field is required."],"groups":["This field is required."],"profile_picture":["This field is required."]}}

虽然content字段尊重required=False参数，但创建的\u不遵守，因此，它为我提供了UserSerializer中的required=False验证错误列表：

class CommentSerializer(ContentSerializer):

    created_by = UserSerializer(required=False)
    content = serializers.PrimaryKeyRelatedField(queryset=Content.objects.all(), required=False)

    class Meta:
        model = Comment

{"created_by":{"username":["This field is required."],"user_permissions":["This field is required."],"password":["This field is required."],"groups":["This field is required."],"profile_picture":["This field is required."]}}

根据处理嵌套对象的部分，它演示了序列化程序的用法

我所尝试的：

我之前关于这一点的讨论和尝试添加get_验证_排除没有帮助，因为我相信这一点已经得到了关注

将created_by更改为created_by=serializers.PrimaryKeyRelatedFieldrequired=False可以工作，但这不是我想要的

对现有问题的快速搜索表明，我不是唯一一个有此问题的人： 更新：

我已经创建了几个测试用例，请参见，但无法复制该问题，看起来它只是通过Ajax Post发生的。

我在created_by字段中添加了read_only=True，现在它工作正常

class CommentSerializer(ContentSerializer):

    created_by = UserSerializer(required=False, read_only=True)
    content = serializers.PrimaryKeyRelatedField(queryset=Content.objects.all(), required=False)

    class Meta:
        model = Comment