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POCan't delete cache for specific entry in Django
 

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  1. POCan't delete cache for specific entry in Django
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    <p>I'm trying to purge cache for one specific Entry when it is saved using signals.</p> <p>I'm using decorators (<code>signals</code> and <code>render_to</code>) from <a href="https://bitbucket.org/offline/django-annoying" rel="nofollow noreferrer"><code>django-annoying</code></a></p> <pre><code>@signals.post_save(sender=Artigo) def artigo_post_save(instance, **kwargs): from django.http import HttpRequest from django.utils.cache import get_cache_key from django.core.cache import cache # cache.delete(instance.get_absolute_url()) # not work request = HttpRequest() request.method = "GET" request.path = '/' + instance.get_absolute_url() print 'request path: ', request.path key = get_cache_key(request=request, key_prefix=settings.CACHE_MIDDLEWARE_KEY_PREFIX) print "found key" if cache.has_key(key) else "notfound key" if cache.has_key(key): cache.delete(key) cache.set(key, None, 0) </code></pre> <ul> <li>The problem is that when I save the model, I get output <code>"notfound key"</code>, so the cache continues without purge</li> <li><code>request.path</code> are point properly to my entry path.</li> </ul> <p>Some settings:</p> <pre><code>SESSION_ENGINE = "django.contrib.sessions.backends.cache" CACHE_MIDDLEWARE_ANONYMOUS_ONLY = True CACHE_MIDDLEWARE_KEY_PREFIX = 'cache' CACHE_MIDDLEWARE_SECONDS = 600 CACHES = { 'default': { 'LOCATION': '', 'BACKEND': 'django.core.cache.backends.locmem.LocMemCache' }, } </code></pre> <p>And the view:</p> <pre><code>@cache_page(60 * 60) @render_to('artigo.html') def artigo(request, categoria_slug, extra_slug="", artigo_slug=""): ... </code></pre> <p>Thank you.</p> <p><strong>EDIT:</strong><br> I did <a href="https://stackoverflow.com/a/10484328/1499847">Ilvar</a> changes and now i'm getting <code>"found key"</code> as return but I still can't delete cache:</p> <pre><code> key = _generate_cache_header_key(key_prefix=settings.CACHE_MIDDLEWARE_KEY_PREFIX, request=request) key = key.replace(settings.LANGUAGE_CODE, settings.LANGUAGES[0][0]) </code></pre> <p>Conf:</p> <pre><code>LANGUAGE_CODE = 'pt-BR' LANGUAGES = ( ('pt-BR','Portugues'), ) </code></pre> <ul> <li>I only have the content updated when I restart the Gevent Server.</li> </ul>
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    1. USCommunity
    1. USRafael Capucho
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    1. COSomehow your calculated value value of `key` must be different than the value from the CacheMiddleware. I would try observing the values of `cache_key` in `django/middleware/cache.py` `FetchFromCacheMiddleware` and `UpdateCacheMiddleware` using either a debugger or print statements.
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      1. USuser27478
    2. COJust to check if the problem will be reproduceable, try to replace caching engine to smth like memcached or redis.
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      1. POCan't delete cache for specific entry in Django
      1. USalecxe
    3. COIf you are using locales, the get_cache_key also uses the Language code to build the cache key, add this to your code → request.LANGUAGE_CODE = settings.LANGUAGE_CODE
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      1. POCan't delete cache for specific entry in Django
      1. USMario César
 

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