<filename>app/storage/mixins.py
from rest_framework import mixins


class CreateRetrieveDestroyModelMixin(mixins.CreateModelMixin,
                                      mixins.RetrieveModelMixin,
                                      mixins.DestroyModelMixin):
    """
    Custom mixin for Creating, Retrieving and Destroying instances
    """
    pass

<filename>app/storage/mixins.py
from rest_framework import mixins


class CreateRetrieveDestroyModelMixin(mixins.CreateModelMixin,
                                      mixins.RetrieveModelMixin,
                                      mixins.DestroyModelMixin):
    """
    Custom mixin for Creating, Retrieving and Destroying instances
    """
    pass

Custom mixin for Creating, Retrieving and Destroying instances