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module DestroyIfZeroQuantity
extend ActiveSupport::Concern
included do
after_save :destroy_if_zero_quantity
end
private
def destroy_if_zero_quantity
byebug
if self.quantity == 0
destroy
elsif self.quantity < 0
# TODO: Can improve this (at the least, with reporting, later).
raise ItemQuantityError
end
end
end
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