What's happening here is that the form doesn't submit a field for beacons
at all if nothing is selected, so the callback doesn't get called. What I
typically do in scenarios like this is add a hidden field whose callback
clears the collection. In your case, you could move the
location.beacons.clear inside the hidden callback for id and have it all
taken care of.
Derek
On Wed, Sep 16, 2009 at 8:57 AM, Aaron Valade aval...@gmail.com wrote:
Hello all-
I'm having an issue when trying to update a many-to-one collection
attached to a JPA object in Lift. I'm currently using a
SHtml.multiSelect for choosing which objects should be assigned to the
many-to-one collection. My bind statement looks like this:
bind(location, xhtml,
id - SHtml.hidden(() = locationVar(current)),
name - SHtml.text(location.name, location.name = _),
beacons - SHtml.multiSelect(choices, default, {bsIds : List
[String] = {
location.beacons.clear
bsIds.map( id =
location.beacons.add(Model.getReference(classOf
[Beacon], id.toLong) ) )
} } ),
save - SHtml.submit(?(Save), doAdd) )
This works great when I'm adding or removing beacons to my location as
long as I don't unselect all options. When I unselect all options, my
closure for the multiSelect doesn't get called so the beacons Set
doesn't get cleared out.
How can I capture when I unselect everything in my multiSelect?
Thanks in advance!
- Aaron
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