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I have a nested field collection item, field_collection_parent which contains one field_text and a field collection field_collection_child contains two text fields(field_a and field_b).

Now I'm trying to add more field_collection_child into an existing field_collection_parent (using its entity_id) but the new field_collection_child is not getting created.

Below are my codes:

$entityId = 331;

$field_collection_1 = entity_load('field_collection_item', array($remId));

$field_collection_2 = entity_create('field_collection_item', array('field_name' => 'field_collection_child'));
$field_collection_2->setHostEntity('field_collection_parent', $field_collection_1);
$field_collection_2->field_a['und'][0]['value'] = 'http://www.google.com';
$field_collection_2->field_b['und'][0]['value'] = 'http://www.google.com';
$field_collection_2->save();

Even I've tried https://www.drupal.org/node/2382811, but no luck.

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