deleting a model: post_delete exception on CRUDEvent creation: object_id cannot be null

[mschoettle]

We have a management command that deletes data before inserting new data. When deleting the old data, the following exception is logged:

ERROR   2024-09-05 15:48:59,791 crud_flows 34 139698482645768 easy audit had a pre_save exception on CRUDEvent creation. instance: <xxx>, instance pk: None
Traceback (most recent call last):
  File "/usr/local/lib/python3.11/site-packages/django/db/backends/utils.py", line 89, in _execute
    return self.cursor.execute(sql, params)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/django/db/backends/mysql/base.py", line 75, in execute
    return self.cursor.execute(query, args)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/MySQLdb/cursors.py", line 179, in execute
    res = self._query(mogrified_query)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/MySQLdb/cursors.py", line 331, in _query
    self._do_get_result(db)
  File "/usr/local/lib/python3.11/site-packages/MySQLdb/cursors.py", line 136, in _do_get_result
    self._result = result = self._get_result()
                            ^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/MySQLdb/cursors.py", line 363, in _get_result
    return self._get_db().store_result()
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
MySQLdb.IntegrityError: (1048, "Column 'object_id' cannot be null")

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/local/lib/python3.11/site-packages/easyaudit/signals/crud_flows.py", line 114, in post_delete_crud_flow
    log_event(
  File "/usr/local/lib/python3.11/site-packages/easyaudit/signals/crud_flows.py", line 41, in log_event
    audit_logger.crud(
  File "/usr/local/lib/python3.11/site-packages/easyaudit/backends.py", line 13, in crud
    return CRUDEvent.objects.create(**crud_info)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/django/db/models/manager.py", line 87, in manager_method
    return getattr(self.get_queryset(), name)(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/django/db/models/query.py", line 658, in create
    obj.save(force_insert=True, using=self.db)
  File "/usr/local/lib/python3.11/site-packages/django/db/models/base.py", line 814, in save
    self.save_base(
  File "/usr/local/lib/python3.11/site-packages/django/db/models/base.py", line 877, in save_base
    updated = self._save_table(
              ^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/django/db/models/base.py", line 1020, in _save_table
    results = self._do_insert(
              ^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/django/db/models/base.py", line 1061, in _do_insert
    return manager._insert(
           ^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/django/db/models/manager.py", line 87, in manager_method
    return getattr(self.get_queryset(), name)(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/django/db/models/query.py", line 1805, in _insert
    return query.get_compiler(using=using).execute_sql(returning_fields)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/django/db/models/sql/compiler.py", line 1822, in execute_sql
    cursor.execute(sql, params)
  File "/usr/local/lib/python3.11/site-packages/django/db/backends/utils.py", line 67, in execute
    return self._execute_with_wrappers(
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/django/db/backends/utils.py", line 80, in _execute_with_wrappers
    return executor(sql, params, many, context)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/django/db/backends/utils.py", line 84, in _execute
    with self.db.wrap_database_errors:
  File "/usr/local/lib/python3.11/site-packages/django/db/utils.py", line 91, in __exit__
    raise dj_exc_value.with_traceback(traceback) from exc_value
  File "/usr/local/lib/python3.11/site-packages/django/db/backends/utils.py", line 89, in _execute
    return self.cursor.execute(sql, params)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/django/db/backends/mysql/base.py", line 75, in execute
    return self.cursor.execute(query, args)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/MySQLdb/cursors.py", line 179, in execute
    res = self._query(mogrified_query)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/MySQLdb/cursors.py", line 331, in _query
    self._do_get_result(db)
  File "/usr/local/lib/python3.11/site-packages/MySQLdb/cursors.py", line 136, in _do_get_result
    self._result = result = self._get_result()
                            ^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/MySQLdb/cursors.py", line 363, in _get_result
    return self._get_db().store_result()
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
django.db.utils.IntegrityError: (1048, "Column 'object_id' cannot be null")

I assume that at this point (post delete) instance.pk returns None. Maybe the solution is to do instance.pk or "" or (-1)?

[mschoettle]

This happens when the transaction is committed. Which for some reason is not being done in the test:

django-easy-audit/easyaudit/signals/model_signals.py

Line 250 in 94b2c57

if getattr(settings, "TEST", False):

I'll try to reproduce this in a test case with TEST=False.