Blob representation in admin field
I'm implementing ion-auth's user table into Fuel's admin, and that library stores the ip_address field as a blob.
I'm trying to think how to represent this as a field. The value has to be run through inet_ntop() to get the string value, and otherwise the fields show a non-ascii character. I can put the decoded value into 'after_html', but that solution still has the blob char represented. Ideally, I'd like to have a label for the field, the actual value in a hidden input, but don't want the Fuel fields rendering the stored value. The 'custom' field type might be the solution, but when I try it in my user_model, (as per the docs) I get:
call_user_func() expects parameter 1 to be a valid callback, function 'my_custom_field' not found or invalid function name