Likewise, I too am confused by Massimo's suggestion of using:
if cache.ram('init',lambda:db(db.auth_user).isempty(),None):
arbitrary_function()
The True value indicating auth_user is empty is stored in the cache.ram
'init' value, then never updated. In my test code, 'arbitary_function'
gets executed every time a page is loaded (since True for .isempty() is
cached), even after records are added to auth_user....
It's only after I stop web2py, restart (and the new value is stored in
cache.ram 'init' does the function stop being executed.
How can setting a cache.ram value then setting the expiration of the value
to None / never expire every work?
On Monday, March 31, 2014 at 2:57:00 PM UTC-5, Jay Martin wrote:
>
> I'm confused as to why this scenario needs caching.
>
> Isn't it true that for an empty user table:
>
> if cache.ram('init',lambda:db(db.auth_user).isempty(),None):
> arbitrary_function()
>
> will only cache the boolean value True and keep that value (True) in cache
> forever (until the app is restarted), associated with the given key 'init'?
>
> Therefore, only this initial state is remembered. All future executions of
> this code will only ever return this initial value (True), therefore the
> subsequent arbitrary function will continue to be executed every cycle of
> execution.
>
> Am I missing something? Many thanks!
>
>
>
> On Friday, August 10, 2012 11:23:56 PM UTC-4, Massimo Di Pierro wrote:
>>
>> you stil want to cache that
>>
>> if cache.ram('init',lambda:db(db.mytable).isempty(),None):
>>
>>
>>
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