That's works really thank you for your time, learned a very good thing 
today, 1 week im on this X) . Already look a little to Prefetch() function 
but haven't understand how to use it in my case^^

I have replaced my {% with currscat=categ.getscateg %} by {% with 
currscat=categ.souscategorie_set.all %} like in your example, that's work 
"_set.all" return me only "visible" child without more request but i don't 
understand how that's work, it is supposed to return me all objects, it 
don't include a filter, Prefetch() function do this?

Thanks for your additionnals advices i'll look at this.


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