[TODO: open a new site for technical posts or revamp this one so that they don't get mixed up...!!]
After a long time, thanks to the lovely spirit, opportunity and encouragement I received from my fellow spiders @ spiderlogic, I actually managed to contribute something however insignificant to the GRAILS open-source community.
For a has-many relationship where we need to select one of the existing
options – here is a new checkBoxList tag that can be used.
Label List
tag can be used as well to show the selected items (though
eventually I just added a helper method in the domain object to get the
list as a string).