How do I clear and replace a collection in a one-to-many relationship in Grails/Groovy

Question

This question is in two parts, first part is about clearing a list and second part is about assigning an owner to an object.

I have a one-to-many relationship between tw

Answer 1

Here's what works for me:

activePerson.locations.clear()
activePerson.properties = params

...

activePerson.save()

This clears the set of locations, then adds back just the ones currently selected in params.