# views.py
def get_object(self,pk):
    post = get_object_or_404(self.queryset, pk=pk)
    self.check_object_permissions(self.request, post) 
    return post

class BasePermission(metaclass=BasePermissionMetaclass):
    """
    A base class from which all permission classes should inherit.
    """

    def has_permission(self, request, view):
        """
        Return `True` if permission is granted, `False` otherwise.
        """
        return True

    def has_object_permission(self, request, view, obj):
        """
        Return `True` if permission is granted, `False` otherwise.
        """
        return True

from rest_framework.permissions import BasePermission

class CustomObjectPermission(BasePermission):
    def has_object_permission(self, request, view, obj):
        return obj.user == request.user