gistfile1.txt

		$(".topic_field").autocomplete({
			minLength: 1,
			source: '/topics.json',
			focus: function(event, ui) {
	           $('.topic_field').val(ui.item.topic.name);
               return false;
           },
            select: function(event, ui) {
			   var url = $('.edit_video').attr('action');
			   var val = ui.item.topic.name;
			   $.ajax({type:"PUT", url:(url + ".js"), data:{video:{topic_names:val}}});
			   return false;
		    }
          })