#35984: functools.singledispatchmethod on Django models don't work
-------------------------------------+-------------------------------------
Reporter: Simon Gomizelj | Owner: (none)
Type: Bug | Status: closed
Component: Database layer | Version: 4.2
(models, ORM) |
Severity: Normal | Resolution: needsinfo
Keywords: | Triage Stage:
| Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Comment (by Simon Gomizelj):
I know what the issue is. There's a weak key map under the hood:
{{{#!python
class singledispatchmethod:
# snip
def __get__(self, obj, cls=None):
if self._method_cache is not None:
try:
_method = self._method_cache[obj]
except TypeError:
self._method_cache = None
except KeyError:
pass
else:
return _method
}}}
Since Django models `__hash__` is driven by the pk, this is fundamentally
incompatible with this optimization.
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Ticket URL: <https://code.djangoproject.com/ticket/35984#comment:4>
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