Django Rest Framework: Disable field update after object is created

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It seems that you need different serializers for POST and PUT methods. In the serializer for PUT method you are able to just except the username field (or set the username field as read only).

class UserViewSet(viewsets.ModelViewSet):
    """
    API endpoint that allows users to be viewed or edited.
    """
    serializer_class = UserSerializer
    model = User

    def get_serializer_class(self):
        serializer_class = self.serializer_class

        if self.request.method == 'PUT':
            serializer_class = SerializerWithoutUsernameField

        return serializer_class

    def get_permissions(self):
        if self.request.method == 'DELETE':
            return [IsAdminUser()]
        elif self.request.method == 'POST':
            return [AllowAny()]
        else:
            return [IsStaffOrTargetUser()]

Check this question django-rest-framework: independent GET and PUT in same URL but different generics view

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