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

Clearing Collection approach didn't worked for me:

activePerson.locations.clear()

Just try iterate over collection with avoiding ConcurrentModificationException by calling collect():

activePerson.locations.collect().each {
    item.removeFromLocations(it)
}

And after that save the entity to execute SQL statement:

activePerson.save flush:true

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Link to article to read more: http://spring.io/blog/2010/07/02/gorm-gotchas-part-2/