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Caching question: nocache/dynamic blocks inside foreach loop

 
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ndorphin
Smarty Rookie


Joined: 24 Dec 2009
Posts: 15
Location: Berlin, Germany
PostPosted: Fri Dec 25, 2009 1:29 am    Post subject: Caching question: nocache/dynamic blocks inside foreach loop Reply with quote
Hello,

i've the following question about smarty caching (i use now Smarty3 B5 but I had the same problem with Smarty2 -> instead of {nocache} tags from S3 i 've used dynamic blocks in S2):

I have a loop through a lot of objects for displaying a table like:

Code:

{foreach $objects as $object...}
  {Display a lot of properties from $object with heavy db load, but good cachable because values are not changing so often}
  {Diplaying a view count for the $object => not cachable}
{/foreach}


I didn't found a possibility to make only the view count value not cachable. The view count will be load by a special object that get the ID from the loop object. If i set this line with the {nocache} tags like

Code:
{nocache}{$cache->getViewCount($loopObject->getId())}{/nocache}


i get an error that i called the function ->getId() on a non object (because the $loopObject does not exists in the written cached file). If i try to assing the id value to a variable before like

Code:

{nocache}{assign var=ID value=$loopObject->getId()}{/nocache}

or
Code:

{assign var=ID value=$loopObject->getId() nocache}


it will also not work. The only way it to set the hole {foreach} as nocached what makes the cache sensless. What i need is a solution that in the final cache file the $loopObject ->getId() call is replaced with the real Value returned by the ->getId() call like:

Code:
{$cache->getViewCount(1234)}


where 1234 is the real value of the id of my $loopObject. Maybe Something like modifier

Code:
{nocache}{$cache->getViewCount($loopObject->getId()|realvalue)}{/nocache}


or the possibility of setting the{nocache} tags inside the function call like

Code:
{nocache}{$cache->getViewCount({/nocache}{$loopObject->getId()}{nocache})}{/nocache}


Hope that someone could understand my problem..
Thanks a lot for help
ndorphin
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U.Tews
Administrator


Joined: 22 Nov 2006
Posts: 5068
Location: Hamburg / Germany
PostPosted: Fri Dec 25, 2009 4:30 pm    Post subject: Reply with quote
This can't work as there is no way to get variable data from inside a cached {foreach} as nocached values into the cache file.

Would it be possible to assign with litle overhead also for a cached page an array with the id's from the script? In this case you could use something like this:
Code:

{nocache}{$i=0}{/nocache}
{foreach $objects as $object...}
  {Display a lot of properties from $object with heavy db load, but good cachable because values are not changing so often}
  {Diplaying a view count for the $object => not cachable}
{nocache}{$cache->getViewCount($idarray[$i])}{$i=$i+1}{/nocache}
{/foreach}
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ndorphin
Smarty Rookie


Joined: 24 Dec 2009
Posts: 15
Location: Berlin, Germany
PostPosted: Fri Dec 25, 2009 6:58 pm    Post subject: Reply with quote
U.Tews wrote:
This can't work as there is no way to get variable data from inside a cached {foreach} as nocached values into the cache file.

Would it be possible to assign with litle overhead also for a cached page an array with the id's from the script? In this case you could use something like this:
Code:

{nocache}{$i=0}{/nocache}
{foreach $objects as $object...}
  {Display a lot of properties from $object with heavy db load, but good cachable because values are not changing so often}
  {Diplaying a view count for the $object => not cachable}
{nocache}{$cache->getViewCount($idarray[$i])}{$i=$i+1}{/nocache}
{/foreach}


Ok, fine that will help a bit.

But maybe this will be a good feature request to transform a loop variable value into a fixed variable within a cached block. Something like

Code:
{nocache}{assing var=fixed value=$someLoopVariableOrProperty makefixedvalue}{/nocache}


or the possibility to hard code a variable value into a nocached block like

Code:
{nocache}{$cache->getViewCount({$loopValue|makefixedvalue})}{/nocache}


From technical view this should possible during generate the cached file or not?

Thanks a lot!
ndorphin
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