nextval.py

from django.db import connection
from django.utils.deconstruct import deconstructible


def nextval(regclass):
    with connection.cursor() as cursor:
        cursor.execute(f"select nextval('{regclass}')")
        next_id_row = cursor.fetchone()
        return next_id_row[0]


@deconstructible
class NextSeqValue:
    def __init__(self, regclass):
        self.regclass = regclass

    def __call__(self):
        return nextval(self.regclass)

    def __eq__(self, other):
        return self.regclass == other.regclass