uhm..... I think that this particular case should be retained as it is:
belongs accepts either a list or a set, but not a string, and **should**
fail when you pass to it a string instead of a list.
either way your code should do
possible_items = request.vars.items
if isinstance(possible_items, str):
possible_items = [possible_items]
results = db(db.table.belongs(possible_items))
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