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The answer is that it's already an option! Just select Multiple: Yes in the field options; Multiple : if set to "No" the field will allow the selection of a single group of users, if set to "Yes" it will be possible to select multiple groups of users.


I would not bother implementing a Joomla extension for this task. A mysql trigger (simply done via phpMyAdmin) is going to be a stable solution -- least likely to break while upgrading Joomla (you only need to be concerned if the table schemas change). Here are a couple of educational pages: MySQL Trigger after update only if row has changed and Get OLD ...


I found the error in my query. Original: JOIN mus_virtuemart_product_categories as pc ON pc.virtuemart_product_id=vmp.product_parent_id Joomla query: ->join('INNER', $db->quoteName('#__virtuemart_product_categories','pc') . ' ON (' . $db->quoteName('pc.virtuemart_product_id') . ' = ' . $db->quoteName('vmp.virtuemart_product_id') . ')') ...

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