add extra helper method to lookup field mapping
add extra helper method to lookup field mapping

HonzaMikula/masivnipostele,GawainLynch/bolt,lenvanessen/bolt,nikgo/bolt,lenvanessen/bolt,electrolinux/bolt,bolt/bolt,romulo1984/bolt,nikgo/bolt,romulo1984/bolt,nikgo/bolt,electrolinux/bolt,GawainLynch/bolt,romulo1984/bolt,GawainLynch/bolt,rarila/bolt,Intendit/bolt,joshuan/bolt,lenvanessen/bolt,HonzaMikula/masivnipostele,Intendit/bolt,GawainLynch/bolt,electrolinux/bolt,joshuan/bolt,Intendit/bolt,nikgo/bolt,Intendit/bolt,rarila/bolt,bolt/bolt,joshuan/bolt,romulo1984/bolt,bolt/bolt,electrolinux/bolt,joshuan/bolt,bolt/bolt,rarila/bolt,HonzaMikula/masivnipostele,lenvanessen/bolt,HonzaMikula/masivnipostele,rarila/bolt