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Just thought I'd mention that repopulating checkboxes and radio buttons is working but only in relatively new builds, so you should download the latest "develop" core code.

Here's a stripped down version of what I have working. Hope this helps. On a side note, there are some config template variables for formatting the html output (field_template, multi_field_template, required_mark). I've been able to tweak these to generate meaningful html output for all form fields except checkboxes and radio buttons. For checkboxes and radio buttons, I haven't been able to use the templates to print both the field label and the text that goes along side the checkboxes. For example, in the example below for the field "group_id", I'm unable to get both the label "User Type" as well as the text next to the checkboxes, "User" and "Administrator" to print out. If anyone can explain how to change the multi_field_template variable to do that, I'd love to know. Controller:

Controller_Admin extends Controller
{
public function action_add_edit_admin($user_id = null)
{
...
$view = View::factor('admin/view_admin_add_edit');
$form = Fieldset::factory('form_admin')->add_model('Model_admin', array($user_id))->repopulate();
...
if ($form->validation()->run() == TRUE)
{
$success = Model_admin::register_user($form, $user_id);

if ($success)
{
..
}
else
{
...
}
...

$view->set('user_id', $user_id);
$this->template->content = $view;
}

Model code:

class Model_Admin extends Model_User
{
 public static function set_form_fields(Fieldset $form, $user_id = null
 {
 if ($user_id != null)
  {
   $admin = self::get_info($user_id);
   if (empty($admin))
   {
    return false;
   }
  }

  $form->add('first_name',
   'First Name',
   array(
    'type' => 'text',
    'value' => ! empty($admin['first_name']) ? $admin['first_name'] : '',
    'id' => 'first-name',
    'size' => 50,
   ),
   array(
    array('required'),
    array('trim'),
    array('max_length', 50),
   )
  );

  $auth_groups = self::get_auth_groups();
// Generates something like: $auth_groups = array('1' => 'User', '10' => Administrator');

  $form->add('group_id',
   'User Type',
   array(
    'type' => 'radio',
    'options' => $auth_groups,
    'id' => 'group-id',
    'value' => ! empty($admin['group_id']) ? $admin['group_id'] : '',
   ),
   array(
   )
  );


 $form->add('form_cancel', null,
   array(
    'type' => 'submit',
    'value' => 'Cancel'
   )
  );

  $form->add('submit', null,
   array(
    'type' => 'submit',
    'value' => 'Submit'
   )
  );
    }
}

View:

...
echo $form->show_errors();

 if (empty($user_id))
  echo '<h1>Create Administrator</h1>';
 else
  echo '<h1>Edit Administrator</h1>';

 echo $form->form()->open();

 foreach ($form->field() as $index => $row)
&#123;
  echo $row;
 }

 echo $form->form()->close();

@leo-nard: That would be great if the form printing for checkboxes and radio buttons could be fixed. Thanks.

leo-nard: I just downloaded and checked out your code, and it works much better. A couple things I noticed: 1. The "required_mark" is missing from the fields
2. If I change:

'multi_field_template'  => "\t\t\t{label}\n {fields}\t\t\t{label}{required} {field}{fields}",

To:

'multi_field_template'  => "\t\t\t{label}\n {fields}\t\t\t{field}{label}{required} {fields}",

It reverses the checkbox and the checkbox text so that the checkbox is before the text. I usually prefer that order, but maybe it's just me.