cakephp one form, multiple models, not displaying one model's validation messages

Question

I have a registration form and I am creating a record in both User and Identity tables (a user hasMany identities)

the form looks like this

Answer 1

hasMany model's fields should be as array (when combined with parent model), see .0 added between field names

echo $this->Form->input('Identity.0.name');
echo $this->Form->input('Identity.0.surname');
...
echo $this->Form->input('Identity.0.email');