Comments (7)
You can use
MyModel.objects.filter(pk=id).update(last_downloaded_at=now())
which won't trigger invalidation as mass update, see CAVEATS, 4.
And yes, you should be careful when saving this objects anywhere. And since there is no easy way to write an object to cache currently, you should probably use .nocache().get(...)
when planning to save object back:
obj = MyModel.objects.nocache().get(pk=id)
...
obj.save()
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Added no_invalidation
without parameters in df5562f.
from django-cacheops.
I didn't get what you mean by instant updates of certain fields. Invalidation doesn't update anything.
I do however see a scenario where invalidation should be postponed for performance reasons, like some bulk write. I see it like:
try:
with cacheops.no_invalidation(SomeModel):
# many writes
finally:
cacheops.invalidate_model(SomeModel)
from django-cacheops.
I was talking about data that is fine as stale. To explain what I meant better, imagine a scenario like this:
def show(id):
obj = MyModel.objects.get(pk=id)
# ... Renders a template with the model as context
def download(id):
# This view is accessed just as often as the show() view
obj = MyModel.objects.get(pk=id) # Cache hit
obj.last_downloaded_at = now() # This data isn't used anywhere and can be stale
obj.save() # Invalidates the cache, thus forcing show() to hit the db again
# ... Return the response
Obviously, there are issues with skipping invalidation like this. For instance you'd have to be very careful not to overwrite fields with stale data from the cache. This could perhaps be solved by updating the specific model object in the cache, but leaving the query result caches alone.
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Alright, that's an acceptable (albeit slightly ugly) workaround for now, thanks. I like the idea of the no_invalidation context manager as well by the way for multiple writes in a sequence, have a case it'd be perfect for.
from django-cacheops.
Is there any chance to see cacheops.no_invalidation in ther near future?
from django-cacheops.
I have no specific plans. The fastest way to get that is to implement it yourself :) It shouldn't be too hard.
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Related Issues (20)
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- Nik
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- AWS Elasticache Redis Serverless Implementation is raising AttributeError HOT 6
- cache wrongly set to empty list for get query (when accessing a foreignkey field) HOT 15
- conj keys always have -1 as expiration in redis 7 HOT 3
- Are we supporting model translation with django cacheops ? HOT 5
- Potential Concurrency Issue Leading to Cache Inconsistency in Multithreaded Environment HOT 6
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