Drupal programatically create a form with a for condition - forms

Question

I'm trying to create a form to create a person, and this person can have some relation with another one (like a wife, husband, child, ..), so I try to create something with a button to add a relation, here is my code :
if (empty($form_state['number_liaisons'])) {
$form_state['number_liaisons'] = 1;
}
$form['info_contact']['liaison'] = array(
"#type" => "fieldset",
"#title" => "Liaisons",
"#attributes" => array("class" => array("center"))
);
for ($i = 1; $i <= $form_state['number_liaisons']; $i++) {
$form['info_contact']['liaison'][$i] = array(
"#type" => "fieldset",
"#title" => "Liaison",
"#attributes" => array("class" => array("center"))
);
$form['info_contact']['liaison'][$i]['contact'] = array(
'#type' => 'textfield',
'#title' => t("Personne a lier"),
'#autocomplete_path' => 'crm/autocomplete_liaison',
);
$form['info_contact']['liaison'][$i]['type'] = array(
'#type' => 'select',
'#title' => t("Type de liaison"),
'#options' => Array('enfant' => 'Enfant', 'conjoint' => 'conjoint'),
'#empty_option' => t('- Choisir un type de liaison -'),
);
}
$form['info_contact']['liaison']['add_item'] = array(
'#type' => 'submit',
'#value' => t('Add liaison'),
'#submit' => array('liaison_add_item'),
'#limit_validation_errors' => array(),
);
if ($form_state['number_liaisons'] > 1) {
$form['info_contact']['liaison'] = array(
'#type' => 'submit',
'#value' => t('Remove liaison'),
'#submit' => array('liaison_remove_item'),
'#limit_validation_errors' => array(),
);
}
And the two methods to add / remove a relation :
function liaison_add_item($form, &$form_state)
{
$form_state['number_liaisons']++;
$form_state['rebuild'] = true;
}
function liaison_remove_item($form, &$form_state)
{
if ($form_state['number_liaisons'] > 1) {
$form_state['number_liaisons']--;
}
$form_state['rebuild'] = true;
}
My problem is that when I click on the "Add liaison" button all the fields disappear, and when I click on the remove liaison the fields came back.
So when I have more than 1 in my $form_state['number_liaisons'] the for doesn't show my fields.
Anyone know how to fix that?

Answer 1

I think it's because the liaisons all share the same field name, the $form_state doesn't really care if they are nested. So try renaming to something like;
["contact_{$i}"] rather than just ['contact']