It doesn't necessarily have to be a QuerySet; any function or method that
takes some processing time could be decorated (e.g., an external call to an
API). My aim is to reduce this code:
def do_some_processing():
cache_key = "key"
if cached_value := cache.get(cache_key):
return cached_value
fresh_value = do_some_computing()
cache.set(cached_value, fresh_value, 30)
return fresh_value
to this:
@cached_context("key", timeout=30)
def do_some_processing():
return do_some_computing()
AFAIK cache.set evaluates QuerySets, how would that be a problem?.
26 Ağustos 2022 Cuma tarihinde saat 12:24:39 UTC+3 itibarıyla Adam Johnson
şunları yazdı:
> I'm not sure I quite understand your proposal. Are you suggesting a
> decorator that caches the results of every queryset that is resolved within
> the decorated function?
>
> If so, I'm not sure how useful it would be. First, if a single query is
> problematic, there’s normally a way to optimize it within the database -
> for example, a materialized view allows you to “cache” query results and
> recompute them in the background. Second, QuerySets are lazy, so it could
> be surprising to decorate a function that returns a QuerySet that is not
> yet resolved.
>
> On Wed, Aug 24, 2022 at 3:49 PM suayip uzulmez <suayi...@gmail.com> wrote:
>
>> Usually, I need to construct a simple cache pipeline to optimize database
>> access using low-level cache API (django.core.cache).
>>
>> I think we could use a decorator as such to ease this process:
>>
>> cached_context(key, *, timeout, cache)
>>
>> I know higher-level utilities exist such as cache_page, however I think
>> the decorator above provides more granularity over what to cache. For
>> example, I usually need such decorator in model methods where I do some
>> database aggregation operations based on the instance.
>>
>> What do you think?
>>
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