MIGX: where filter didn't work

I have a TV checkbox output on MIGX named "categories". This will output a comma delimited output (i.e "category1,category2,category3"). So my filter shows like this



I checked out filters here https://github.com/Bruno17/MIGX/blob/master/core/components/migx/model/migx/migx.class.php#L1588

and i think "find_in_set" operator is the right one for what i'm looking for filters. The problem is it didn't work.

Any idea why? Or am i missing something else? Thanks

does this help:
https://forums.modx.com/thread/88890/migx-where-filter-snippet-contains

or this one?
https://forums.modx.com/thread/82046/getresourcestag-migx?page=2#dis-post-452818

This one solved it: https://forums.modx.com/thread/82046/getresourcestag-migx?page=2#dis-post-452818

Thank you so much Bruno17, works like a charm