[Rails] acts_as_list crashes with non-numeric id

Seems to me acts_as_list has a bug -- I have data where the row id is a
random alphaNumeric, not a simple integer. Using acts_as_list with a
scope of a related model id, acts_as_list crashes the app due to a
faulty query in MySQL something like this:

class LineItem < ActiveRecord::Base
belongs_to :order
acts_as_list :scope => :order_id
end

Unknown column 'UXPzIdeIuIFkz6n' in 'where clause': UPDATE `line_items`
SET position = (position - 1) WHERE (order_id = UXPzIdeIuIFkz6n AND
position > 5)

I've been trying several ways to force substition to generate those
needed quotes myself, but so far no luck.

Anyone battle & solve this? Thx.

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