contact.py

class ContactSerializer(PermittedFieldsModelSerializer):
   """
   Used by

   POST /v3/contact
    GET /v3/contact
    PATCH /v3/contact
    and CompanySerializer
    
   remove accepts_dit_email_marketing from the listing serializer 
   """
    def to_representation(self, instance):
        """
        Convert instance to dict.

        Optionally lookup from consent service if feature flag
        is enabled.
        """
        representation = super().to_representation(instance)
        if is_feature_flag_active(GET_CONSENT_FROM_CONSENT_SERVICE) and 'accepts_dit_email_marketing' in representation:
            representation['accepts_dit_email_marketing'] = consent.get_one(representation['email'])
        return representation

class ContactListSerializer(ContactSerializer):
   """
   Used by
    GET /v3/contact/
   """
   class Meta(ContactSerializer.Meta)
      exclude = ['accepts_dit_email_marketing']



                               
class ContactViewSet:
   #....
   serializer_class = ContactSerializer
   def get_serializer_class(self):
       if self.action == 'retrieve' and is_feature_flag_active(GET_CONSENT_FROM_CONSENT_SERVICE):
           return ContactListSerializer

        return super(ContactViewSet, self).get_serializer_class()
            

urls.py

import ContactDetailViewSet



contact_item = ContactViewSet.as_view({
    'get': 'retrieve',
    'patch': 'partial_update',
})


urls = [
    path('contact/<uuid:pk>', contact_item, name='detail'),
    #....
]