I need to compare two field values.

Let's say I have a content type named "Specimen". The content title is the accepted name of that specimen. A second field, named Synonyms, can be filled by users to suggest synonyms for the accepted name.

What I need is a field validation with that kind of test : If the synonym matches any title of that content type, then display a message (That synonym is actually an accepted name already entered in the database) and invalidate the value entered. Else, the synonym is valid and can be entered in the form.

I know Uniqueness which is a great module to compare titles between them but not between a CCK Field and each title (unless I missed something?)

I have tried to configure a test with the module Field validation but did not manage to get a nice result, even with the test "Match against a field". Maybe it was not set properly.

I guess that Rules can be my friend too but for now, I have always created very simple rules. So I would appreciate any help to build this test.

  • you can override the submit handler for the form to perform this check with a simple string position check
    – Geoff
    Commented Mar 20, 2015 at 4:03
  • Could you be more specific? Thanks.
    – Toki
    Commented Mar 20, 2015 at 13:14

1 Answer 1


Finally, I found a solution with the module Field Validation and a PHP Code validation rule associated to my field Synonyms:

$titles=db_query('SELECT title FROM {node} WHERE type = :type',$args)->fetchCol();
foreach ($titles AS $title){
if ($this->value==$title){$this->set_error();}

It works like a charm.

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