Selecting multiple values from select tag - Grails

Question

Could you please anyone tell me how to get multiple values from

I have this in my create.gsp

Answer 1

According to this docs: http://www.grails.org/doc/1.3.7/ref/Tags/select.html your select tag is wrong, it should be rather:

<g:select name="validator.id"
    multiple="multiple"
    optionKey="id"
    from="${com.project.Validator.list()}"
    value="${contact?.validators*.id}" />

Answer 2

Your MME is because the get() on Domain classes only handles one id at a time. For multiple ids from your <select/> use.

def validators = Validator.getAll(params.list('validator.id'))

The params.list() will always fetch 'validator.id' as a List even if there's only one, which will save you from having to test for single vs multiple results from your <select/>.