get node id of field collection

Question

I have the following code. I am able to load the field collection item using entity_load_single. I want to be able to get the node id for a given field collection item. How can I achieve this?

function dc_car_guide_model($model_id)
{
    $model = entity_load_single('field_collection_item', $model_id);
    //How can I get nid?
}

Answer 1

$model = entity_load_single('field_collection_item', $model_id);
$node = $model->hostEntity();
echo $node->nid;

Answer 2

Using EntityFieldQuery:

  $query = new EntityFieldQuery();
  $query->entityCondition('entity_type', 'node')
    ->fieldCondition('field_MYCOLLECTIONFIELD', 'value',  $model_id, '=');
  $result = $query->execute();

  if (!empty($result['node'])) {
    $nid = key($result['node']);
  }

replace field_MYCOLLECTIONFIELD with the machine name of the Field Collection field on your node.