[TYPO3-dev] About empty cHash

[Francois Suter]

Hi all,

I have made an extension which relies on 2 plugins (it's vge_tagcloud). 
The first plugin (pi1) builds a tag cloud, the second (pi2) displays a 
list of pages related to each keyword. The keyword and the related 
pages' uid are passed as piVars in the URL pointing to the page where 
pi2 is located.

pi2 is a cached USER object and has $pi_checkCHash = true;

However this is apparently not sufficient to avoid the empty cHash 
problem. As far as I understand (after re-reading The mysteries of cHash 
and looking around the mailing lists), this is because the cHash of the 
links are not stored in the cache table. The reason - as I understand it 
- is because the links are generated in pi1 but point to pi2. The links 
are generated inside a stdWrap property inside pi1, which means I'm not 
calling some of the tslib_pibase methods where one can tell that the 
cHash should be stored.

One solution I found is to set to true the property useCacheHash of the 
typolink, but this means I have the cHash in the URL, which I would 
rather avoid. Is there any way around this?

I was thinking of generating all the links for the tag cloud even if 
they are not used directly (because the links are done from inside the 
stdWrap), but at least all the cHashes would be stored. Is there a more 
elegant way?

Thanks for any pointers

-- 

Francois Suter
Cobweb Development Sarl - http://www.cobweb.ch