custom mod_roster

Hi there, I'm new to erlang and ejabberd, checking it out to see if it'll fit my purposes.

At the moment, I'm essentially trying to implement a custom roster module based on the original. Essentially, I want to add my own attributes to a roster item that I can read and write via XML. For example, the typical roster items include jid, name, subscription, etc. I'm trying to add a few more items that each contact in a roster can have. My first step was simply to add the item I wanted to the "roster" record in mod_roster.hrl, e.g:

-record(roster, {usj,
us,
jid,
name = "",
subscription = none,
some_custom_item,
ask = none,
groups = [],
askmessage = [],
xs = []}).

Though when I try to run it, I get error messages about bad records, essentially:

=ERROR REPORT==== 2010-03-05 17:22:30 ===
E(<0.352.0>:ejabberd_hooks:335) : {{badrecord,roster},
[{mod_shared_roster,
'-get_user_roster/2-fun-2-',2},
{lists,mapfoldl,3},
{mod_shared_roster,get_user_roster,2},
{ejabberd_hooks,run_fold1,4},
{mod_roster,process_iq_get,3},
{gen_iq_handler,process_iq,6},
{gen_iq_handler,handle_info,2},
{gen_server,handle_msg,5}]}
running hook: {roster_get,[{"someuser","localhost"}]}

which doesn't really tell me a whole lot. I'd thought there might be a conflict since records in that table won't have the item, so I cleared the database all together (actually by erasing the install directory and rebuilding, if anyone knows a better way to reset the database I'm all ears), hoping it would create the table with my own record intact, but I still get the message.

If you have any ideas on how I can implement this I'd love to hear them!

Thanks.