如何使用Django Rest Framework将数据添加到ManyToMany字段？

I'm relatively new to DJango and I am looking to add data to a many-to-many field using serializers from rest framework.

我对DJango比较陌生，我希望使用rest framework中的序列化器将数据添加到多对多字段中。

My Model:

我的型号：

class IngFamily(models.Model):
 name=models.CharField(max_length=30, unique=True, verbose_name='ingredient parent')

class UserProfile(models.Model):
      user=models.ForeignKey(User)
      allergies=models.ManyToManyField(IngFamily, verbose_name='allergies', null=True)

Now, I want to add data to the UserProfile model using the rest api.

现在，我想使用其余的api将数据添加到UserProfile模型。

I've looked around, but couldn't find much anywhere.

我环顾四周，但在任何地方都找不到。

So far what I've achieved:

到目前为止我取得的成就：

serializer:

串行：

class IngFlySerializer(serializers.ModelSerializer):

  class Meta:
    model = IngFamily
    fields= ('name',)


class UserProfileSerializer(serializers.ModelSerializer):
  allergies=IngFlySerializer(many=True,)
  class Meta:
        model = UserProfile
        fields=('allergies',)

  def create(self, validated_data):

    allergies_data =validated_data.pop('allergies', [])

    #import pdb;pdb.set_trace()
    user1=UserProfile.objects.create(**validated_data)
    for allergy in allergies_data:

      al=IngFamily.objects.filter(name=allergy.get('name'))
      #al.name=allergy.get('name')
      user1.allergies.add(al)

    user1.save()
    return user1

When I try using this, "al" is empty.

当我尝试使用它时，“al”是空的。

view:

视图：

class user_profile(generics.ListCreateAPIView):


  serializer_class = UserProfileSerializer
  permission_classes = (permissions.IsAuthenticated,)

  def get_queryset(self):
        user = self.request.user
        return UserProfile.objects.filter(user=user)

  def perform_create(self, serializer):
      #import pdb; pdb.set_trace()
      serializer.save(user=self.request.user)

class UserDetail(generics.RetrieveDestroyAPIView):
    serializer_class = UserProfileSerializer
    permission_classes = (permissions.IsAuthenticated,)

    def get_queryset(self):
        user1 = self.request.user
        return UserProfile.objects.filter(user=user1)

My Post request would look this:

我的帖子请求看起来像这样：

{"allergies": [{"name": ["Beef"]},{"name": ["Pork"]}]}

I've been stuck on this for a while, any help would be appreciated :)

我已经坚持了一段时间，任何帮助将不胜感激:)

1 个解决方案

#1

Couple of things can be tried :

可以尝试几件事：

1. It might be possible your database dont have some of the allergies coming in with user data. Thats why your al is coming empty.
2. 您的数据库可能可能没有用户数据中的某些过敏症。这就是为什么你的al会变空。
3. saving user data before you add allergies to it. This is important.
4. 在添加过敏症之前保存用户数据。这个很重要。
5. By using ipdb or pdb, try to understand in what data form 'allergy' and 'allergies_data' is coming out. If indeed it is what you have written, there is no reason the following code shouldnt work.
6. 通过使用ipdb或pdb，尝试了解'过敏'和'allergies_data'的数据形式。如果确实是你所写的，那么以下代码就没有理由不起作用。

---

def create(self, validated_data):
    allergies_data =validated_data.pop('allergies')
    user1=UserProfile.objects.create(**validated_data)
    user1.save()
    for allergy in allergies_data:
        al=IngFamily.objects.get_or_create(name=allergy['name'])
        user1.allergies.add(al)
    return user1