[html-formfu] add to related table using save_to_model()

[kewei xiao]

Hi Carl

    I am converting all my apps to new HTML::FormFu components.  Now I 
am not sure how I can use save_to_model() to add to related table.

    Normally I do like this: $row->add_to_related_table( { category => 
$c->req>param('category') } ).  Please advise.

Ke Wei