There are lots of ways to do this, the easiest is probably to just define 
the uploadfolder for the field in the controller for workbench 
creation/update instead of defining your custom store and retrieve. 
Something like this:


def create_workbench():
    """ Form to create a workbench in a given repository """
    rep = db.repository[request.args(0)]
    if rep is None:
        raise HTTP(404)
    db.workbench.workbench.uploadfolder = rep.directory
    form = SQLFORM(db.workbench)
    if form.process().accepted:
        response.flash = 'Yay'
    elif form.errors:
        response.flash = 'Nay'


def update_workbench():
    """ Form to update a workbench """
    wb = db.worbench[request.args(0)]
    db.workbench.workbench.uploadfolder = wb.repository.directory
    form = SQLFORM(db.workbench, wb)
    if form.process().accepted:
        response.flash = 'Yay'
    elif form.errors:
        response.flash = 'Nay'

I haven't tried it, but this should work if you remove your custom store 
and retrieve.



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