Django 1.9 removed get_cache from django.core.cache

Rosetta 0.7.8, Django 1.9. Using memcached backend. Error:

rosetta/poutil.py
from django.core.cache import get_cache
ImportError: cannot import name 'get_cache'

Django 1.9 release notes: django.core.cache.get_cache is removed

[mbi]

In your case the missing memcached exception was swallowed by that ImportError handler, but actually we no longer need that, as Rosetta only supports Django 1.7+ now. I’ve removed it in c80f2db4a3ec11bf8c5636db29ce0ceb278e4a7e

[saschwarz]

That gave the answer:

 $ python manage.py shell --settings=dev_settings
Python 2.7.8 (default, Oct 19 2014, 16:06:28) 
[GCC 4.2.1 Compatible Apple LLVM 5.1 (clang-503.0.40)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
(InteractiveConsole)
>>> from rosetta.conf import settings as rosetta_settings
>>> from django.core.cache import caches
>>> cache = caches[rosetta_settings.ROSETTA_CACHE_NAME]
Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "/Users/saschwarz/.virtualenvs/django19/lib/python2.7/site-packages/django/core/cache/__init__.py", line 80, in __getitem__
    cache = _create_cache(alias)
  File "/Users/saschwarz/.virtualenvs/django19/lib/python2.7/site-packages/django/core/cache/__init__.py", line 55, in _create_cache
    return backend_cls(location, params)
  File "/Users/saschwarz/.virtualenvs/django19/lib/python2.7/site-packages/django/core/cache/backends/memcached.py", line 159, in __init__
    import memcache
ImportError: No module named memcache

In my new Django 1.9 venv I hadn’t installed memcache! I hadn’t noticed it because the new rosetta code checked that I had an incompatible cache backend and when I enabled my production backed in dev the ImportError was being caught/handled by: https://github.com/mbi/django-rosetta/blob/develop/rosetta/poutil.py#L12

I guess you could do something to not hide that type of traceback:

try:
    from django.core.cache import caches
    cache = caches[rosetta_settings.ROSETTA_CACHE_NAME]
except ImportError as e:
    try:
        from django.core.cache import get_cache
        cache = get_cache(rosetta_settings.ROSETTA_CACHE_NAME)
    except ImportError:
        if 'No module named' in e.message:
            raise e
        raise

But it could be brittle… or my situation is unusual… I could create a PR if you think this is valuable.

Sorry to have taken your time for my mistake. Thanks so much for all your help debugging this!