django.db.utils.IntegrityError: (1451, 'Cannot delete or update a parent row: a foreign key constraint fails') code example

Example: error 1451 (23000): cannot delete or update a parent row: a foreign key constraint fails

SET FOREIGN_KEY_CHECKS = 0; -- to disable FK checks (ex: for delete purpose)
SET FOREIGN_KEY_CHECKS = 1; -- to re-enable FK checks