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I'm trying to build a new widget for the entity reference module. (nested checkboxes = tree according to entity references between nodes)

The only answer I'm looking for is : "How to get the list of all entity reference fields and their params? (child and parent node)

Thank you for your help!


Edit : working on D7

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I can get the list of all entity reference fields for one child, but I don't know how to get the parent node type of each field. – Ludovic Aug 22 '12 at 15:17
I have the same problem. You can get parent entity in field table "field_data_$field_name" but i cant get all field names of all entityreference fields – milkovsky Mar 5 '13 at 10:04
see my solution in the answer below – milkovsky Mar 5 '13 at 10:56

Here is my custom function that gets id's of all files referenced entities and their parents. Also get's all field names, entity types and bundles of entityreference fields.

function _my_module_get_entityreferences_settings() {
  $child_ids = $field_names = $settings = array();

  // Get all entityreference field names
  $query = db_select('field_config', 'f');
  $query->fields('f', array('field_name'));
  $query->condition('f.type', 'entityreference');
  $rows = $query->execute();

  foreach ($rows as $row) {
    $field_name = $row->field_name;
    $field_names[] = $field_name;

  // Loop all entityreference fields. Get all child and parent Ids
  foreach ($field_names as $field_name) {
    $table = 'field_data_' . $field_name;
    $target_id = $field_name . '_target_id';

    $query = db_select($table, 'f');
    $query->fields('f', array('entity_id', $target_id, 'entity_type', 'bundle'));
    $rows = $query->execute();

    foreach ($rows as $row) {
      $settings[$row->entity_type][$row->bundle][$field_name] = $field_name;
      $child_ids[$row->{$target_id}] = array(
        'id' => $row->{$target_id},
        'parent' => $row->entity_id,

  return array(
    'childs' => $child_ids,
    'settings' => $settings,

Might you don't need all this stuff. When you get $field_names array you can use

$field = field_info_field($field_name);

to get settings of current field. You can find here referenced bundles, field type, handler_settings etc.

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