While trying to interate over file filed values, EMW cannot being created properly. using isset() for not iniated fields and then trying to set them is not helping.

I get the error:

EntityMetadataWrapperException: Unknown data property field_discipline. in EntityStructureWrapper->getPropertyInfo() (line 335 of /var/www/siradisisporlar.com/sites/all/modules/ssbasic/entity/includes/entity.wrapper.inc).

Note that file wrapper here is EntityStructureWrapper and node wrapper is EntityDrupalWrapper.

All properties of other entity reference fields, etc are being reached properly.

$filew::data is array and it has fid where $nodew::data is a proper node object.

mymodule_node_insert($node) {
  //.... ..... $nodew is node wrapper
  foreach ($nodew->field_media as $delta => $filew) {
    $a = $filew->field_taxonomy_entity_reference->value(); //error here
    $b = $nodew->field_taxonomy_entity_reference->value();
    $c = array_unique(array_merge($a, $b));
    $filew->field_taxonomy_entity_reference = $c; //error here
  • Also, you cannot reach other fields of the file object here, like alt text or owner.
    – duru
    Commented Apr 18, 2015 at 21:10
  • $filew->getIdentifier() also comes null.
    – duru
    Commented Apr 19, 2015 at 11:05

1 Answer 1


Sadly, I am posting a very bad workaround for future reference. Anybody who can improve this is welcome:

function mymodule_node_insert($node) {
  //copy terms
  $nodew = entity_metadata_wrapper('node', $node);
  //@todo this is not cool, figure it out
  foreach ($nodew->field_media->value() as $delta => $files) {
    $filew = entity_metadata_wrapper('file', $files['fid']);
    $filew->field_taxonomy_entity_reference = array_unique(array_merge($filew->field_taxonomy_entity_reference, $nodew->field_taxonomy_entity_reference));


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