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Last active March 22, 2016 16:36
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Setting multi-valued reference fields programmatically in Drupal 8.
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entity.php
<?php
use Drupal\node\Entity\Node;
// node 1 has 'field_ref', which is a multi-valued field currently referencing nodes 2 and 3.
$node = Node::load(1);
$node->field_ref[] = 4;
$node->save(); // 'field_ref' now contains [2,3,4].
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