Disable temporary nested serializer

[plusmen...@gmail.com]

Hello everyone! I'm new in Django. 

I have a serializer with nested serializer like this: 

 ################ Project Serializer with nested customer serializer ###########################

class ProjectSerializer(serializers.ModelSerializer):

    id = serializers.IntegerField(required=False) 

    customer = CustomerSerializer(required=True)

    class Meta: 

        model = Project

        fields = '__all__'

        

    def __init__(self, customer_serializer_included=True, *args, **kwargs):

        super(ProjectSerializer, self).__init__(*args, **kwargs)

        self.customer = CustomerSerializer(required=customer_serializer_included)

########### BillingActivitySerializer that uses Project serializer (without nested serializer) ###########################

class BillingActivitySerializer(serializers.ModelSerializer):

     id = serializers.IntegerField(required=False)

     project = ProjectSerializer(required=True, customer_serializer_included = False)

The problem is that everytime i use the project serializer, also nested serializer are used too. I'd like to exclude the nested serializer. I've try to do this in the __init__ but Django gives always a 400 Bad request

Response: {

  "project": {

    "customer": [

      "This field is required."

    ]

  }

}

Thanks in advance