<?
mysql_connect (”localhost”, “DBUSERNAME”, “DBPASSWORD”) or die (’I cannot connect to the database because: ‘ . mysql_error());
mysql_select_db (”MTDATABASE”);
$query = “SELECT DISTINCT comment_author_rss, comment_author FROM mt_comment
WHERE comment_author_rss <> ” order by comment_author”;
$result = mysql_query($query);
$numrows = mysql_num_rows($result);
for ($i=0; $i < $numrows; $i++) {
$row = mysql_fetch_array($result);
if (stristr($row['comment_author_rss'], “.rdf”) || stristr($row['comment_author_rss'], “.xml”)) {
echo $row['comment_author'];
echo “<br>”;
echo “<a href=\”".$row['comment_author_rss'].”\”>”;
echo $row['comment_author_rss'];
echo “</a>”;
echo “<br>”;
echo “<br>”;
}
}
?>

my $rssfeed = $q->param(’rssfeed’) || ”;
if ($rssfeed) {
require MT::Util;
if (my $fixed2 = MT::Util::is_valid_url($rssfeed)) {
$rssfeed = $fixed2;
} else {
return $app->handle_error($app->translate(
“Invalid URL ‘[_1]‘”, $rssfeed));
}
}
$comment->author_rss(remove_html($rssfeed));

Just add this:

$comment->author_rss($q->param(’rssfeed’));

It turns out that I had forgotten about the subscribe to comments script. Since I didn’t put the new fields in the processing.tmpl page, they got lost before they were entered in the database.

After I read your instructions here (and after I stopped banging my head on my computer monitor!) I went and added the new fields to processing.tmpl. Now it works like a charm!