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serializationdjango-rest-frameworkforeign-keysdjango-rest-viewsets

Django-rest :send POST request with 2 foreign key


I want to post a data in a serializer, having 2 ForeignKey.
I have these models:

class Child(models.Model):
    first_name = models.CharField(max_length=40)
    description = models.CharField(max_length=40)

class Parent(models.Model):
    name = models.CharField(max_length=20)
    pet = models.ForeignKey(pet)
    child = models.ForeignKey(Child, related_name='boys')

class Pet(models.Model):
    kind = models.CharField(max_length=40)
------------------,
Class PetSerializer(ModelSerializer):
    class Meta:
        model = Pet
        fields = ('kind',)

class ParentSerializer(ModelSerializer):    
    pet = PetSerializer(many=True): 
    class Meta:
        model = Parent
        fields = ('name', 'pet')

class ChildSerializer(ModelSerializer):
    boys = ParentSerializer() 

    class Meta:
        model = Child
        fields = ('first_name', 'boys')

My first question: Is it possible to get the output as:

{
    "first_name": "Peter",
    "boys": [
      {
        "name": "Bill",
         "kind": "dog"
        }
      ]
   }

My second question:And I am trying to send data to create a new model, by using this method:




    def create(self, validated_data):
        clean_data = validated_data.pop('boys')
        child = Child.objects.create(**validated_data)
        for data in clean_data:
            Parent.objects.create(child=child, **data)
        return child
But I got this error: TypeError: Direct assignment to the reverse side of a related set is prohibited. Use boys.set() instead.

Solution

  • Just for your first question, you can use source parameter in your ParentSerializer class:

    class ParentSerializer(ModelSerializer):    
        kind = serializers.CharField(source='pet.kind'): 
        class Meta:
            model = Parent
            fields = ('name', 'kind')