Django REST Framework不同深度的POST / PUT？ [英] Django REST Framework different depth for POST/PUT?

问题描述

我正在使用Django REST框架为我的网络应用程序创建一个API。我有一个类'Comment'，它在 Meta 类中设置 depth = 2 。 GET 评论。当我尝试发送一个 POST 或 PUT 请求（即创建一个新的注释）我被告知我需要包含对象而不是ForeignKey ID。

这是我的Serializer类：

  class CommentSerializer（serializers.ModelSerializer ）：
 class Meta：
 model =注释
 depth = 2 
  

模型：

 类注释（models.Model）：
 user = models.ForeignKey（User，null = true，blank = True，
 related_name ='comments'）
 budget = models.ForeignKey（Budget，related_name ='comments'）
 published = models.BooleanField（default = False）
 body = models.TextField（）
 created = models.DateTimeField（auto_now_add = True）
  

视图代码：

 类注释（generics.ListCreateAPIView）：
 
 model =注释
 serializer_class = CommentSerializer 
 
 def pre_save（self，obj）：
 obj.user = self.request.user 
  

输出中显示的错误（JSON）i s：

  {user：[此字段为必填项。]，budget：[{non_field_errors ：[无效数据]}]} 
  

发送此原始数据时：

  {budget：2，published：true，body：Another comment} 
  

解决方案

我相信定义引用外键关系的序列化程序字段的正确方法是像 serializers.PrimaryKeyRelatedField 。我不相信模型序列化程序会自动使用这个字段类，而不会在序列化器类中明确定义它。

http://www.django-rest-framework.org/api-guide/relations/#primarykeyrelatedfield

我可以想象，一个 PrimaryKeyRelatedField serializer将正确处理JSON数据提交，就像您在示例中使用的那样。 p>

I am using Django REST Framework to create an API for my web app. I have a class 'Comment', that has depth=2 set in the Meta class. This works great when GETing the Comments. When I try to send a POST or PUT request though (i.e. create a new Comment) I am told I need to include objects instead of ForeignKey IDs.

Here's my Serializer class:

class CommentSerializer(serializers.ModelSerializer):
    class Meta:
        model = Comment
        depth = 2 

The model:

class Comment(models.Model):
    user = models.ForeignKey(User, null=True, blank=True,
        related_name='comments')
    budget = models.ForeignKey(Budget, related_name='comments')
    published = models.BooleanField(default=False)
    body = models.TextField()
    created = models.DateTimeField(auto_now_add=True)

The view code:

class Comments(generics.ListCreateAPIView):

    model = Comment
    serializer_class = CommentSerializer

    def pre_save(self, obj):
        obj.user = self.request.user

And the error that is displayed in the output (JSON) is:

{"user": ["This field is required."], "budget": [{"non_field_errors": ["Invalid data"]}]}

When this raw data is sent:

{"budget": 2, "published": true, "body": "Another comment"}

解决方案

I believe the proper way to define a serializer field that refers to a foreign key relationship is through something like serializers.PrimaryKeyRelatedField. I don't believe that model serializers automatically use this field class without defining it explicitly in the serializer class.

http://www.django-rest-framework.org/api-guide/relations/#primarykeyrelatedfield

I would imagine that a PrimaryKeyRelatedField serializer would correctly handle JSON data submissions like the one you used in your example.

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