Fix soft-deletion in CartService and update spec

app/services/cart_service.rb

@@ -29,11 +29,15 @@ class CartService
 
     variants_data.each do |variant_data|
       loaded_variant = loaded_variants[variant_data[:variant_id].to_i]
+
+      if loaded_variant.deleted?
+        remove_deleted_variant(loaded_variant)
+        next
+      end
+
       next unless varies_from_cart(variant_data, loaded_variant)
 
-      attempt_cart_add(
-        loaded_variant, variant_data[:quantity], variant_data[:max_quantity]
-      )
+      attempt_cart_add(loaded_variant, variant_data[:quantity], variant_data[:max_quantity])
     end
   end
 
@@ -41,12 +45,16 @@ class CartService
     @indexed_variants ||= begin
       variant_ids_in_data = variants_data.map{ |v| v[:variant_id] }
 
-      Spree::Variant.where(id: variant_ids_in_data).
+      Spree::Variant.with_deleted.where(id: variant_ids_in_data).
         includes(:default_price, :stock_items, :product).
         index_by(&:id)
     end
   end
 
+  def remove_deleted_variant(variant)
+    line_item_for_variant(variant).andand.destroy
+  end
+
   def attempt_cart_add(variant, quantity, max_quantity = nil)
     quantity = quantity.to_i
     max_quantity = max_quantity.to_i if max_quantity

spec/services/cart_service_spec.rb

@@ -60,7 +60,7 @@ describe CartService do
         let(:relevant_line_item) { order.reload.find_line_item_by_variant(variant) }
 
         describe "when the soft-deleted variant is not in the cart yet" do
-          xit "doesn't fail, and does not add the deleted variant to the cart" do
+          it "does not add the deleted variant to the cart" do
             variant.delete
 
             cart_service.populate({ variants: { variant.id.to_s => { quantity: '2' } } }, true)
@@ -70,17 +70,17 @@ describe CartService do
           end
         end
 
-        describe "when the soft-deleted variant already has a line_item in the cart" do
+        describe "when the soft-deleted variant is already in the cart" do
           let!(:existing_line_item) {
             create(:line_item, variant: variant, quantity: 2, order: order)
           }
 
-          xit "doesn't fail, and removes the line_item from the cart" do
+          it "removes the line_item from the cart" do
             variant.delete
 
-            cart_service.populate({ variants: { variant.id.to_s => { quantity: '2' } } }, true)
+            cart_service.populate({ variants: { variant.id.to_s => { quantity: '3' } } }, true)
 
-            expect(relevant_line_item).to be_nil
+            expect(Spree::LineItem.where(id: relevant_line_item).first).to be_nil
             expect(cart_service.errors.count).to be 0
           end
         end