Create Spree::SimpleOrderContents

Spree::OrderContents interacts heavily with the current promotion
system. This adds a new `Spree::SimpleOrderContents` class that we can
use once all the core functionality and specs for the legacy promotion
system are migrated to `solidus_legacy_promotions`.

We're keeping `Spree::OrderContents` though, with the intention of
moving it to `solidus_legacy_promotions` in the future.

core/app/models/spree/order_contents.rb

@@ -1,39 +1,9 @@
 # frozen_string_literal: true
 
 module Spree
-  class OrderContents
-    attr_accessor :order
-
-    def initialize(order)
-      @order = order
-    end
-
-    # Add a line items to the order if there is inventory to do so
-    # and populate Promotions
-    #
-    # @param [Spree::Variant] variant The variant the line_item should
-    #   be associated with
-    # @param [Integer] quantity The line_item quantity
-    # @param [Hash] options Options for the adding proccess
-    #   Valid options:
-    #     shipment: [Spree::Shipment] LineItem target shipment
-    #
-    # @return [Spree::LineItem]
-    def add(variant, quantity = 1, options = {})
-      line_item = add_to_line_item(variant, quantity, options)
-      after_add_or_remove(line_item, options)
-    end
-
-    def remove(variant, quantity = 1, options = {})
-      line_item = remove_from_line_item(variant, quantity, options)
-      after_add_or_remove(line_item, options)
-    end
-
-    def remove_line_item(line_item, options = {})
-      order.line_items.destroy(line_item)
-      after_add_or_remove(line_item, options)
-    end
-
+  class OrderContents < Spree::SimpleOrderContents
+    # Updates the order's line items with the params passed in.
+    # Also runs the PromotionHandler::Cart.
     def update_cart(params)
       if order.update(params)
         unless order.completed?
@@ -43,7 +13,7 @@ def update_cart(params)
           # promotion rules would not be triggered.
           reload_totals
           order.check_shipments_and_restart_checkout
-          PromotionHandler::Cart.new(order).activate
+          ::Spree::PromotionHandler::Cart.new(order).activate
         end
         reload_totals
         true
@@ -52,76 +22,15 @@ def update_cart(params)
       end
     end
 
-    def advance
-      while @order.next; end
-    end
-
-    def approve(user: nil, name: nil)
-      if user.blank? && name.blank?
-        raise ArgumentError, 'user or name must be specified'
-      end
-
-      order.update!(
-        approver: user,
-        approver_name: name,
-        approved_at: Time.current
-      )
-    end
-
     private
 
     def after_add_or_remove(line_item, options = {})
       reload_totals
       shipment = options[:shipment]
       shipment.present? ? shipment.update_amounts : order.check_shipments_and_restart_checkout
-      PromotionHandler::Cart.new(order, line_item).activate
+      ::Spree::PromotionHandler::Cart.new(order, line_item).activate
       reload_totals
       line_item
     end
-
-    def reload_totals
-      @order.recalculate
-    end
-
-    def add_to_line_item(variant, quantity, options = {})
-      line_item = grab_line_item_by_variant(variant, false, options)
-
-      line_item ||= order.line_items.new(
-        quantity: 0,
-        variant: variant,
-        adjustments: [],
-      )
-
-      line_item.quantity += quantity.to_i
-      line_item.options = ActionController::Parameters.new(options).permit(PermittedAttributes.line_item_attributes).to_h
-
-      line_item.target_shipment = options[:shipment]
-      line_item.save!
-      line_item
-    end
-
-    def remove_from_line_item(variant, quantity, options = {})
-      line_item = grab_line_item_by_variant(variant, true, options)
-      line_item.quantity -= quantity
-      line_item.target_shipment = options[:shipment]
-
-      if line_item.quantity <= 0
-        order.line_items.destroy(line_item)
-      else
-        line_item.save!
-      end
-
-      line_item
-    end
-
-    def grab_line_item_by_variant(variant, raise_error = false, options = {})
-      line_item = order.find_line_item_by_variant(variant, options)
-
-      if !line_item.present? && raise_error
-        raise ActiveRecord::RecordNotFound, "Line item not found for variant #{variant.sku}"
-      end
-
-      line_item
-    end
   end
 end

core/app/models/spree/simple_order_contents.rb

@@ -0,0 +1,120 @@
+# frozen_string_literal: true
+
+module Spree
+  class SimpleOrderContents
+    attr_accessor :order
+
+    def initialize(order)
+      @order = order
+    end
+
+    # Add a line items to the order if there is inventory to do so
+    # and populate Promotions
+    #
+    # @param [Spree::Variant] variant The variant the line_item should
+    #   be associated with
+    # @param [Integer] quantity The line_item quantity
+    # @param [Hash] options Options for the adding proccess
+    #   Valid options:
+    #     shipment: [Spree::Shipment] LineItem target shipment
+    #
+    # @return [Spree::LineItem]
+    def add(variant, quantity = 1, options = {})
+      line_item = add_to_line_item(variant, quantity, options)
+      after_add_or_remove(line_item, options)
+    end
+
+    def remove(variant, quantity = 1, options = {})
+      line_item = remove_from_line_item(variant, quantity, options)
+      after_add_or_remove(line_item, options)
+    end
+
+    def remove_line_item(line_item, options = {})
+      order.line_items.destroy(line_item)
+      after_add_or_remove(line_item, options)
+    end
+
+    def update_cart(params)
+      if order.update(params)
+        unless order.completed?
+          order.line_items = order.line_items.select { |li| li.quantity > 0 }
+          order.check_shipments_and_restart_checkout
+        end
+        reload_totals
+        true
+      else
+        false
+      end
+    end
+
+    def advance
+      while @order.next; end
+    end
+
+    def approve(user: nil, name: nil)
+      if user.blank? && name.blank?
+        raise ArgumentError, 'user or name must be specified'
+      end
+
+      order.update!(
+        approver: user,
+        approver_name: name,
+        approved_at: Time.current
+      )
+    end
+
+    private
+
+    def after_add_or_remove(line_item, options = {})
+      shipment = options[:shipment]
+      shipment.present? ? shipment.update_amounts : order.check_shipments_and_restart_checkout
+      reload_totals
+      line_item
+    end
+
+    def reload_totals
+      @order.recalculate
+    end
+
+    def add_to_line_item(variant, quantity, options = {})
+      line_item = grab_line_item_by_variant(variant, false, options)
+
+      line_item ||= order.line_items.new(
+        quantity: 0,
+        variant: variant,
+        adjustments: [],
+      )
+
+      line_item.quantity += quantity.to_i
+      line_item.options = ActionController::Parameters.new(options).permit(PermittedAttributes.line_item_attributes).to_h
+
+      line_item.target_shipment = options[:shipment]
+      line_item.save!
+      line_item
+    end
+
+    def remove_from_line_item(variant, quantity, options = {})
+      line_item = grab_line_item_by_variant(variant, true, options)
+      line_item.quantity -= quantity
+      line_item.target_shipment = options[:shipment]
+
+      if line_item.quantity <= 0
+        order.line_items.destroy(line_item)
+      else
+        line_item.save!
+      end
+
+      line_item
+    end
+
+    def grab_line_item_by_variant(variant, raise_error = false, options = {})
+      line_item = order.find_line_item_by_variant(variant, options)
+
+      if !line_item.present? && raise_error
+        raise ActiveRecord::RecordNotFound, "Line item not found for variant #{variant.sku}"
+      end
+
+      line_item
+    end
+  end
+end