Show me your biggest code done in one line only.
lib['data'].select{|i| i['cover']['src'].nil? and images.find{|img| img[:q] == i['title']+' '+i['author']}}.each_with_index{|v, i| lib['data'].find{|l| l['book_id'] == v['book_id']}['cover'] = get_it.call(images.find{|img| img[:q] == v['title']+' '+v['author']}[:id]) }