3.x - where and null

Hey

in 2.x you could do something like this:

'conditions' => array('parent_id' => $parent_id);

where $parent_id could be an int or null

and it would find parent_id that were null in the table

This approach does not work in 3.x. Is there a right way to do this in 3.x where a field in an INT but can be null ?

/thomas

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