collections - Groovy subcollection -

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what groovy way collection items without items in subcollection. example:

collection: [1,2,3,4,5,6]

subcollection: [1,5,6]

the result should be: [2,3,4]

edit: looks i'm doing wrong. part of code:

    def report = report.get(params.report.id)     def user = user.get(params.user.id)     list<user> availableusers = []     availableusers = user.findallbycompany(company))      list<user> addedusers = []     addedusers = (list<user>) session["addedusers"] ?: []     addedusers << user     session["addedusers"] = null     session["addedusers"] = addedusers      availableusers = availableusers - addedusers

this code removing last user in addedusers list.

availableusers: [john, jack, jim]

addedusers: [john, jack]

availableusers - addedusers: [john, jim]

every time last item in addedusers gets removed. i'm guessing i'm missing obvious cant find it.

did try obvious:

result = [ 1, 2, 3, 4, 5, 6 ] - [ 1, 5, 6 ]

because works...

edit

storing domain object in session result in object being different between hibernate transactions, better store id in session , users fresh each time (or write functionality domain if needs persisting), like:

addedusers = session["addedusers"].collect { user.get( it.id ) } ?: []

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