How to copy data from one field to another in same content type using hook_update_N

Trying to copy data from field A (plain text field) to field B (entity reference field with taxonomy) within the same content type. The taxonomy terms used in field B are the same terms used in old field (field A).

Below is my first attempt in writing a hook for field copy (using hook_update_N) but its not working.

function mymodule_update_8001() {
   $node_type = "test_content_type"; 
   $nidArray = db_query("SELECT nid FROM node WHERE type = '%s' ", $node_type);

  foreach ($nidArray as $nid) {
    $node = node_load($nid);
    $termString = $node->field_a;
    $termObject = taxonomy_term_load_multiple_by_name($termString);
    $node->field_b->target_id = $termObject->tid;
    $node->revision = TRUE;
    node_save($node);
  }
}

Any help on this would be greatly appreciated.

This article was republished from its original source.
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How to copy data from one field to another in same content type using hook_update_N

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