django休息框架 - 永远是INSERT，永远不会UPDATES [英] django rest framework - always INSERTs, never UPDATES

问题描述

我想通过POST更新用户记录。但是，id始终为NULL。即使我传递id似乎被忽略

I want to be able to UPDATE a user record by POST. However, the id is always NULL. Even if I pass the id it seems to be ignored

查看代码：

JSON POSTED：

JSON POSTED:

{
    "id": 1, 
    "name": "Craig Champion", 
    "profession": "Developer", 
    "email": "[e-mail]"
}

@api_view(['POST'])
def get_purchase(request):
    """
    Gets purchase records for a user

    Purchase collection is returned
    """

    user = User();
    serializer = UserSerializer(user, data=request.DATA)

    if serializer.is_valid():

       #The object ALWAYS has ID = nothing at this point

        serializer.save()

        return Response(serializer.data, status=status.HTTP_200_OK)

    else:
        return Response(serializer.errors,   status=status.HTTP_400_BAD_REQUEST)

ModelSerializer

ModelSerializer

class UserSerializer(serializers.ModelSerializer):

    class Meta:
        model = User
        fields = ('id', 'name', 'profession', 'email', 'password', )
        write_only_fields = ('password' , )

模型

class User(models.Model):
    name = models.CharField(max_length=30, null=True, blank=True)
    profession = models.CharField(max_length=100, null=True, blank=True)
    email = models.EmailField()
    password = models.CharField(max_length=20, null=True, blank=True)


    def __unicode__(self):
        return self.name

如何强制更新更新并查看ID？

How can I force the savechanges to update and see the ID?

推荐答案

您需要使用 partial = True 更新具有部分数据的行：

You need to use partial=True to update a row with partial data:

serializer = UserSerializer(user, data=request.DATA, partial=True)

从文档：

默认情况下，序列化程序必须传递所有必需字段
的值，否则它们将抛出验证错误。您可以使用 partial 参数
以允许部分更新。

By default, serializers must be passed values for all required fields or they will throw validation errors. You can use the partial argument in order to allow partial updates.

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