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isDeletable_Boolean

Topher
in The Left Brain

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I'm trying to make an "isDeletable_Boolean" calculation field and I can't quite wrap my head around it. I want to make sure that if the Institution_ID is used anywhere else in the database (which could be in students, courses, contacts, professors, etc.) you cannot delete the institution.

I've done this before but it has usually been much simple with just one referenced field using }:( If ( Count (student::constant) > 0 ; 0 ; 1 ). But now I need to check in many different places.

Thanks for any help.

UPDATE: Well, I solved it but my solution is definitely not very simple. I'm not sure if there's something out there that is simple.

Edited by Guest
Solved, although complexly

Try the attached sample. It may be simpler than what I have, but mine seems pretty simple.

institution.zip

Your calc of }:(

If (UsedCalc>1;0;1) will not work when there is only one related record, in which case it will flag it as delete. It should be (UsedCalc > 0; 0; 1 )

Also instead of two calc, you can use one calc simplified to:

not ( courses::InstID + professors::InstID + students::InstID )

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https://fmforums.com/topic/58784-isdeletable_boolean/
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