Using embedded type instead of hidden error message. Update of existing nodes brings errors.

Well... it avoids the error message but it keeps emptying my form collection after the submit in the administration page. I created the field collection in a user form, so the user type his information in the registration form, everything is perfect until the administrator submit the form after setting the account in active.

I don't really know what it is about, cause the information are not remove from the database, just from the form.

Thanks for the commit by the way, do you think it's because I use it in the user form ? Do I am the only one in this case ?

Ok guys I think I got it, the presave function seems to erase the whole items in the form instead of putting the 'value' key only. As I'm not very used to git I will just post the code here :

function field_collection_field_presave($entity_type, $entity, $field, $instance, $langcode, &$items) {
foreach ($items as &$item) {
// In case the entity has been loaded / created, save it and set the id.
if (isset($item['entity'])) {
if (!empty($item['entity']->is_new)) {
$item['entity']->setHostEntity($entity_type, $entity, LANGUAGE_NONE, FALSE);
}
$item['entity']->save(TRUE);
$item['value'] = $item['entity']->item_id;
}
}
}

In my case it works, tell me about you !