Module: Spree::Core::CalculatedAdjustments

Included in:
Promotion::Actions::CreateAdjustment, ShippingMethod, TaxRate
Defined in:
lib/spree/core/calculated_adjustments.rb

Class Method Summary collapse

Class Method Details

.included(klass) ⇒ Object


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# File 'lib/spree/core/calculated_adjustments.rb', line 4

def self.included(klass)
  klass.class_eval do
    has_one   :calculator, :class_name => "Spree::Calculator", :as => :calculable, :dependent => :destroy
    accepts_nested_attributes_for :calculator
    validates :calculator, :presence => true

    def self.calculators
      spree_calculators.send model_name_without_spree_namespace
    end

    def calculator_type
      calculator.class.to_s if calculator
    end

    def calculator_type=(calculator_type)
      klass = calculator_type.constantize if calculator_type
      self.calculator = klass.new if klass && !self.calculator.is_a?(klass)
    end

    # Creates a new adjustment for the target object (which is any class that has_many :adjustments) and
    # sets amount based on the calculator as applied to the calculable argument (Order, LineItems[], Shipment, etc.)
    # By default the adjustment will not be considered mandatory
    def create_adjustment(label, target, calculable, mandatory=false, state="closed")
      # Adjustment calculations done on Spree::Shipment objects MUST
      # be done on their to_package'd variants instead
      # It's only the package that contains the correct information.
      # See https://github.com/spree/spree_active_shipping/pull/96 et. al
      old_calculable = calculable
      calculable = calculable.to_package if calculable.is_a?(Spree::Shipment)
      amount = compute_amount(calculable)
      return if amount == 0 && !mandatory
      target.adjustments.create(
        :amount => amount,
        :source => old_calculable,
        :originator => self,
        :label => label,
        :mandatory => mandatory,
        :state => state
      )
    end

    # Updates the amount of the adjustment using our Calculator and calling the +compute+ method with the +calculable+
    # referenced passed to the method.
    def update_adjustment(adjustment, calculable)
      # Adjustment calculations done on Spree::Shipment objects MUST
      # be done on their to_package'd variants instead
      # It's only the package that contains the correct information.
      # See https://github.com/spree/spree_active_shipping/pull/96 et. al
      calculable = calculable.to_package if calculable.is_a?(Spree::Shipment)
      adjustment.update_column(:amount, compute_amount(calculable))
    end

    # Calculate the amount to be used when creating an adjustment
    # NOTE: May be overriden by classes where this module is included into.
    # Such as Spree::Promotion::Action::CreateAdjustment.
    def compute_amount(calculable)
      self.calculator.compute(calculable)
    end

    private
    def self.model_name_without_spree_namespace
      self.to_s.tableize.gsub('/', '_').sub('spree_', '')
    end

    def self.spree_calculators
      Rails.application.config.spree.calculators
    end
  end
end