Opened 13 years ago

Closed 13 years ago

Last modified 13 years ago

#15337 closed (worksforme)

cyclic import dependency when extend builtin backend — at Version 1

Reported by: yi.codeplayer@… Owned by: nobody
Component: Core (Cache system) Version: 1.3-beta
Severity: Keywords:
Cc: Triage Stage: Unreviewed
Has patch: yes Needs documentation: no
Needs tests: no Patch needs improvement: no
Easy pickings: no UI/UX: no

Description (last modified by Russell Keith-Magee)

When writing a custom cache backend which inherit from django's builtin memcache backend, say mycache.py: 

    from django.core.cache.backends.memcached import CacheClass as BaseCacheClass
    class MyCache(BaseCacheClass):
        ....

and set backend to "mycache.MyCache" in settings.py, then mycache.py and django.core.cache.__init__.py import each other.
Turn django.core.cache.__init__.py::cache object to be a SimpleLazyObject would solve this problem.

Change History (2)

by yi.codeplayer@…, 13 years ago

Attachment: cache.patch​ added

comment:1 by Russell Keith-Magee, 13 years ago

Description: modified (diff)
Resolution: → worksforme
Status: new → closed

Can't reproduce -- I dropped a custom cache class defined as you describe, and don't the problem you describe. Looking at the code, I can't even work out what set of conditions would allow this to be reproduced -- I don't see any circular dependency. memcached doesn't import anything from the django.core.cache.

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