Question

models.py

from django.db import models
from django.contrib.auth.models import User

class Element(models.Model):
    name = models.CharField(max_length=20)

class Group(models.Model):
    user = models.ForeignKey(User)
    name = models.CharField(max_length=100)
    elements = models.ManyToManyField(Element)
    class Meta:
        unique_together = ('user', 'name')

serializers.py

class ElementSerializer(serializers.HyperlinkedModelSerializer):
# group = serializers.ReadOnlyField(source='group.id')
    class Meta:
        model = Element
        fields = ('name')

""" def save(self, group=None, *args, **kwargs):
    if group is not None:
        self.group = group
    super(ElementSerializer, self).save(*args, **kwargs) """

class GroupSerializer(serializers.HyperlinkedModelSerializer):
    elements = ElementSerializer(many=True)
    class Meta:
        model = Group
        fields = ('url', 'name', 'elements')

views.py

class AddElement(APIView):

    def get(self, request, pk, format=None):
        serializer = ElementSerializer(context={'request': request})
        return Response(serializer.data, status=status.HTTP_200_OK)

    def post(self, request, pk):
        group = DBHandler.get_group_from_id(pk)
        serializer = ElementSerializer(data=request.data, context={'request': request})
        if not serializer.is_valid():
            return Response(serializer.data, status=status.HTTP_400_BAD_REQUEST)
        serializer.save()
        # serializer.save(group = group)

        return Response({}, status=status.HTTP_201_CREATED)

在我看来，我想从给定的数据创建一个元素，然后将此元素分配给现有的组。

我尝试将group作为序列化程序保存参数传递，并且它工作正常（注释代码），但我不知道接下来要去哪里。如何从ElementSerializer获取Element实例？或者还有另一种解决方法吗？

Django REST Framework - 序列化器中的多对多关系

0 个答案: