#14694: defer() doesn't work with reverse relations
-------------------------------------+-------------------------------------
Reporter: sayane | Owner: nobody
Type: Bug | Status: reopened
Component: Database layer | Version: SVN
(models, ORM) | Resolution:
Severity: Normal | Triage Stage: Accepted
Keywords: defer only | Needs documentation: 0
OneToOneField reverse | Patch needs improvement: 1
relationship | UI/UX: 0
Has patch: 1 |
Needs tests: 0 |
Easy pickings: 0 |
-------------------------------------+-------------------------------------
Changes (by mrmachine):
* needs_better_patch: 0 => 1
Comment:
On closer inspection, this fix doesn't fully resolve the problem.
`deferred_to_columns_cb()` still tries to access `field.column`, which
doesn't exist on `RelatedObject`. I tried adding the actual field instead
of the `RelatedObject` to `seen` and `must_include`, but I still get
problems. There are probably ORM complexities that I'm missing here. One
thing that has probably helped this bug to slip under the radar is that
exceptions raised in `deferred_to_columns_cb()` and `deferred_to_data()`
appear to be silenced in some cases. Evaluating a queryset could return no
results when `.count()` shows that there are items in the set, but
converting `querysey.query` to `str` raises an exception.
--
Ticket URL: <https://code.djangoproject.com/ticket/14694#comment:5>
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