I tried this but it didn't work.

     form=SQLFORM.grid(db.Student,
                      editable=False,
                      deletable=False,
                      showbuttontext=False,
                      selectable = [('Assign', lambda ids : assign(ids, 
form))],
                      csv=False)

    form.append(SQLFORM.factory(Field('Class', 'reference Class', 
requires=IS_IN_DB(db, db.Class.id, '%(Class)s')))

    submit = form.element('input',_type='submit', _value='Submit')
    submit['_style'] = 'display:none;'

    return dict(form=form)

def assign(ids, form):
    for id in ids:
        db.StudentClass.insert(Class=form.vars.Class, Student=id)

Any help?

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