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Comments (7)

Suor avatar Suor commented on August 15, 2024 1

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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Suor avatar Suor commented on August 15, 2024 1

Added no_invalidation without parameters in df5562f.

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Suor avatar Suor commented on August 15, 2024

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)

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skrivanos avatar skrivanos commented on August 15, 2024

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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skrivanos avatar skrivanos commented on August 15, 2024

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.

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adalekin avatar adalekin commented on August 15, 2024

Is there any chance to see cacheops.no_invalidation in ther near future?

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Suor avatar Suor commented on August 15, 2024

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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