SilverStripe - limiting the number of many relations a dataobject can have

Question

If I have a $has_many relationship that I want to manage with a GridField in the cms, how would I go about putting a limit on the number of how man

Answer 1

works for me: make the canCreate method of the DataObject that's managed by your GridField check for existing objects.

of course, this doesn't allow you to implement a customg GridFieldComponent, as you need to modify the DataObject code.