php - Cannot update reference app field -

i have item referenced field app. call has assigned client.

i use library: http://podio.github.io/podio-php/

i followed article: http://podio.github.io/podio-php/fields/

i want update existing item changing item_id of field that's referencing app. item_id exists in other app.

here's tried (this happens when webhook triggered):

$item = podioitem::get($_post['item_id']); $item->fields['client']->values = array(     array('item_id' => $id_client) ); $item->save(array(     'hook'      => false,     'silent'    => true )); 

and

$item = podioitem::get($_post['item_id']); $item->fields['client']->values = array('item_id' => $id_client); $item->save(array(     'hook'      => false,     'silent'    => true )); 

where 'client' external id of field , $id_client integer number. here's error get:

[18-aug-2014 17:33:30 utc] php notice:  indirect modification of overloaded property podioitem::$field has no effect in /home1/magikweb/public_html/dev/magik-net/helpdesk/webhook/call.php on line 66 [18-aug-2014 17:33:30 utc] php warning:  creating default object empty value in /home1/magikweb/public_html/dev/magik-net/helpdesk/webhook/call.php on line 66 

if explain me why isn't working i'd grateful. provided documentation not clear on subject.

thank you!

solution

i got work way, credits andreas:

if(!isset($item->fields['client']->values[0]->item_id)){     $item->fields['client'] = new podioappitemfield();     $item->fields['client']->values = array(         array('item_id' => $id_client)     );     $item->save(array(         'hook'      => false,         'silent'    => true     )); } 

you're getting error because client field doesn't exist on item yet. you're trying set values doesn't exist.

you need (untested, should work):

$item = podioitem::get($_post['item_id']);  if (!isset($item->fields['client'])) {     $item->fields['client'] = new podioappitemfield(); }  $item->fields['client']->values = array(     array('item_id' => $id_client) ); $item->save(array(     'hook'      => false,     'silent'    => true )); 

when item podio won't fields in app, ones have values particular item. have check if particular field present before trying set values on it.