#13265: TransactionManagementError doesn't allow for easy debugging of views
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Reporter: orokusaki | Owner: nobody
Status: reopened | Milestone:
Component: Database layer (models, ORM) | Version: SVN
Resolution: | Keywords: transaction
Stage: Unreviewed | Has_patch: 0
Needs_docs: 0 | Needs_tests: 0
Needs_better_patch: 0 |
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Changes (by John Obelenus):
* keywords: => transaction
* status: closed => reopened
* resolution: wontfix =>
Comment:
Seeing TransactionManagementError? that reports that "Transaction managed
block ended with pending COMMIT/ROLLBACK" is the correct symptom.
If you don't commit() or rollback() you will get this error. That much is
obvious and correct. The problem that 'orokusaki' is talking about is if
the view (or code called within the view) doesn't catch an exception
thrown, the view will still give you TransactionManagementError. So, yes
you doing just this: "It's not like we're rethrowing an error and thereby
hiding a stack trace." The return of the view function is an exception,
db.transaction sees the failure case, and raises its own TME exception -
hiding the true problem. The true exception can be an ImportError,
ValueError, TypeError, or any basic error that fingers angry at their
master can cause. In my case I had a simple ValueError from mistyping a
variable name, thus giving an undeclared variable.
The reproduction steps ought to be pretty simple. Cause a basic exception
in a view with the @transaction.commit_manually decorator, don't catch it,
and see the TME exception, not the basic exception with a trace to find
it. If I can do anything to get a test case to let me know how best to
submit it.
--
Ticket URL: <http://code.djangoproject.com/ticket/13265#comment:2>
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