Hello,
I'd like to filter a listing by extrafield and order by extra field alphabetical ASC, i saw in the forum to Open the file modules/mod_k2_content/helper.php and change

case 'alpha' :
$orderby = 'i.title DESC';
break;

by

case 'alpha' :
$orderby = 'i.extra_fields DESC';
break;

but how can I use a specific extra field ?

: my developpment website

Thanks for your kind help