@RvR thanks for the brilliant reply. I have a doubt tough, the method requests a user entity, I should then attach it to the user?, my code goes like this:

$post = new ElggObject();

$post->subtype = 'match';

$post->owner_guid = $userid;

$post->access_id = $access_id;

// this is what I'm looking ot add to the object.

$post->somedata = $somedata1;

$post->moredata = $somedata2;

Then if I understood correctly, in order to add `somedata`and `moredata` to that object, I should then attach the metadata to ...the user?

create_metadata($userid, 'somedata', $somedata1, 'text', $userid, 2);

If so, I'm a bit confused. How would I get this metadata to display?  By getting the userId from getObjectEntity() then trying to get the user?   would this be the right way to do it?

Edited

If you want to add metadata to 'object' ($post) then you should create metadata for it:

create_metadata($post->guid, 'metadata_name', 'metadata_value', 'text', $userid, ACCESS_PUBLIC);

For getting metadata from $post just use:

$somedata1 = $post->somedata;

$somedata2 = $post->moredata;

If you know the post's GUID only then use elgg_get_metadata_from_id function.

If you want to display posts by metadata then use elgg_get_entities_from_metadata function:

echo elgg_get_entities_from_metadata(array(

   'type' => 'object',

   'subtype' => 'match',

   'metadata_name' => 'somedata',

   'metadata_value' => $value,

   'limit' => 0

));

etc

Some examples for creating metadata: 1, 2

More metadata tests also.

And more...

@RvR Brilliant! Thank you!

https://site.name/avatar/edit/username

the 'login:after' event is triggered in an action. After the action is done you get forwarded to a new page (with a new script run). On this new page you didn't tell Elgg to load your JS, so .....

Thanks a lot