## AASM stuff
state_machine :state, :initial => :pending do
    state :pending
    state :placed
    state :completed
    state :back_ordered
    state :partial_back_ordered
    state :cancelled
    state :holding

    before_transition :to => :placed, :do => :prepare_to_be_placed

## Prepare to be placed
def prepare_to_be_placed
    return false unless order_number.blank?

    # Sets gsa information about the order if needed.
    if user.eligible_for_gsa_pricing && order_contains_gsa_items?
      self.gsa = true
      add_gsa_pricing_type_to_line_items
    end

    # Set the tax jurisdiction
    self.tax_jurisdiction = find_tax_jurisdiction

    # Get a new order number
    if valid?
      self.order_number = NextNumber.get_next_number_for(self)
      self.placed_at = Time.now
      self.save
    else
      return false
    end
  end

## Tax jurisdiction
def find_tax_jurisdiction
    if @shipto_country == "US" && %w(TN TX GA MA).include?(@shipto_state)
      ...
    end
  end