92👍
Pop your cached query into Django’s cache:
from django.core.cache import cache
cache.set('key', queryset)
Then create a context processor to add the value of the cache to all templates:
# myproject/myapp/context_processors.py
from django.core.cache import cache
def cached_queries():
return {'cache', cache.get('key')}
Then add your context processor in your Django settings file:
TEMPLATE_CONTEXT_PROCESSORS += (
'myproject.myapp.context_processors.cached_queries'
)
Now you will be able to access the cache
variable in all generic templates and all templates which have a requests context, which a template is given if this is done in the view:
return render_to_response('my_template.html',
my_data_dictionary,
context_instance=RequestContext(request))
When to Set the Cache
It depends on what is contained in the cache. However a common problem is that Django only really gets to execute Python whenever a page request is sent, and this is often not where you want to do this kind of work.
An alternative is to create a custom management command for a particular app. You can then either run this manually when necessary, or more commonly set this to run as a cron job.
To create a management command you must create a class decended from Command
inside of a management/commands
directory located inside of an app:
# myproject/myapp/management/commands/update_cache.py
from django.core.management.base import NoArgsCommand
from django.core.cache import cache
class Command(NoArgsCommand):
help = 'Refreshes my cache'
def handle_noargs(self, **options):
cache.set('key', queryset)
The name of this file is important as this will be the name of the command. In this case you can now call this on the command line:
python manage.py update_cache
16👍
You can also use johnny-cache for automatic caching of querysets. It will (by default) cache all querysets, but you can force it not to cache some.
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