It seems that I have found a bug in all 4.2+ versions of Django (including main branch and 5.0rc). I made a repo with steps to reproduce and full description of the bug – GitHub - FeroxTL/django-sqlite-bug . Long story short: sqlite does not support comments, but when you change (not create) Meta.db_table_comment sqlite backend django.db.backends.sqlite3.schema.DatabaseSchemaEditor
tries to generate COMMENT sql and it obviously falls.
$./manage.py migrate
System check identified some issues:
WARNINGS:
question.QuestionThree: (models.W046) SQLite does not support comments on tables (db_table_comment).
Operations to perform:
Apply all migrations: admin, auth, contenttypes, question, sessions
Running migrations:
Applying question.0001_initial... OK
Applying question.0002_alter_questionthree_table_comment...Traceback (most recent call last):
File "env/lib/python3.10/site-packages/django/db/backends/utils.py", line 89, in _execute
return self.cursor.execute(sql, params)
File "env/lib/python3.10/site-packages/django/db/backends/sqlite3/base.py", line 328, in execute
return super().execute(query, params)
sqlite3.OperationalError: near "COMMENT": syntax error
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "proj/./manage.py", line 22, in <module>
main()
File "proj/./manage.py", line 18, in main
execute_from_command_line(sys.argv)
File "env/lib/python3.10/site-packages/django/core/management/__init__.py", line 442, in execute_from_command_line
utility.execute()
File "env/lib/python3.10/site-packages/django/core/management/__init__.py", line 436, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "env/lib/python3.10/site-packages/django/core/management/base.py", line 412, in run_from_argv
self.execute(*args, **cmd_options)
File "env/lib/python3.10/site-packages/django/core/management/base.py", line 458, in execute
output = self.handle(*args, **options)
File "env/lib/python3.10/site-packages/django/core/management/base.py", line 106, in wrapper
res = handle_func(*args, **kwargs)
File "env/lib/python3.10/site-packages/django/core/management/commands/migrate.py", line 356, in handle
post_migrate_state = executor.migrate(
File "env/lib/python3.10/site-packages/django/db/migrations/executor.py", line 135, in migrate
state = self._migrate_all_forwards(
File "env/lib/python3.10/site-packages/django/db/migrations/executor.py", line 167, in _migrate_all_forwards
state = self.apply_migration(
File "env/lib/python3.10/site-packages/django/db/migrations/executor.py", line 252, in apply_migration
state = migration.apply(state, schema_editor)
File "env/lib/python3.10/site-packages/django/db/migrations/migration.py", line 132, in apply
operation.database_forwards(
File "env/lib/python3.10/site-packages/django/db/migrations/operations/models.py", line 610, in database_forwards
schema_editor.alter_db_table_comment(
File "env/lib/python3.10/site-packages/django/db/backends/base/schema.py", line 640, in alter_db_table_comment
self.execute(
File "env/lib/python3.10/site-packages/django/db/backends/base/schema.py", line 201, in execute
cursor.execute(sql, params)
File "env/lib/python3.10/site-packages/django/db/backends/utils.py", line 102, in execute
return super().execute(sql, params)
File "env/lib/python3.10/site-packages/django/db/backends/utils.py", line 67, in execute
return self._execute_with_wrappers(
File "env/lib/python3.10/site-packages/django/db/backends/utils.py", line 80, in _execute_with_wrappers
return executor(sql, params, many, context)
File "env/lib/python3.10/site-packages/django/db/backends/utils.py", line 84, in _execute
with self.db.wrap_database_errors:
File "env/lib/python3.10/site-packages/django/db/utils.py", line 91, in __exit__
raise dj_exc_value.with_traceback(traceback) from exc_value
File "env/lib/python3.10/site-packages/django/db/backends/utils.py", line 89, in _execute
return self.cursor.execute(sql, params)
File "env/lib/python3.10/site-packages/django/db/backends/sqlite3/base.py", line 328, in execute
return super().execute(query, params)
django.db.utils.OperationalError: near "COMMENT": syntax error