in lib/helpers.rb [263:275]
def get_group_ids_from_params(params)
if params["group_id"] and params["group_ids"]
raise ArgumentError, t(:cannot_specify_group_id_and_group_ids)
end
group_ids = []
if params["group_id"]
group_ids << params["group_id"].to_i
elsif params["group_ids"]
group_ids.concat(params["group_ids"].split(",").map(&:to_i))
end
group_ids
end