Add message about previous orders on checkout page

The message appears if the user ordered before within the same order
cycle and the shop allows to change previous orders.

app/helpers/enterprises_helper.rb

@@ -89,7 +89,11 @@ module EnterprisesHelper
     distance_of_time_in_words(Time.zone.now, enterprise.shop_trial_start_date + Spree::Config[:shop_trial_length_days].days)
   end
 
-  def show_bought_items?
+  def order_changes_allowed?
     current_order.andand.distributor.andand.allow_order_changes?
   end
+
+  def show_bought_items?
+    order_changes_allowed? && current_order.finalised_line_items.present?
+  end
 end

app/views/checkout/_already_ordered.html.haml

@@ -0,0 +1,2 @@
+%p.alert-box.info
+  = t '.message_html', cart: link_to(t('.cart'), cart_path)

app/views/checkout/_form.html.haml

@@ -11,6 +11,7 @@
   = render "checkout/billing", f: f
   = render "checkout/shipping", f: f
   = render "checkout/payment", f: f
+  = render "checkout/already_ordered", f: f if show_bought_items?
   %p
     %button.button.primary{type: :submit}
       = t :checkout_send

app/views/shared/menu/_cart.html.haml

@@ -48,7 +48,7 @@
           = "{{ Cart.dirty ? '#{t(:cart_updating)}' : (Cart.empty() ? '#{t(:cart_empty)}' : '#{t(:cart_edit)}' ) }}"
         %a.button.primary.tiny{href: checkout_path, "ng-disabled" => "Cart.dirty || Cart.empty()"}
           = t '.checkout'
-      - if show_bought_items?
+      - if order_changes_allowed?
         %h5{"ng-if" => "Cart.line_items_finalised.length", style: 'margin-top: 1em'}
           = t '.already_ordered_products'
         %table

config/locales/en.yml

@@ -550,6 +550,15 @@ en:
         invoice_style2?: Use the alternative invoice model that includes total tax breakdown per rate and tax rate info per item (not yet suitable for countries displaying prices excluding tax)
         enable_receipt_printing?: Show options for printing receipts using thermal printers in order dropdown?
 
+# Frontend views
+#
+# These keys are referenced relatively like `t('.message')` in
+# app/views/checkout/_already_ordered.html.haml.
+#
+  checkout:
+    already_ordered:
+      cart: "cart"
+      message_html: "You have an order for this order cycle already. Check the %{cart} to see the items you ordered before. You can also cancel items as long as the order cycle is open."
   home:
     hubs:
       show_closed_shops: "Show closed shops"

spec/features/consumer/shopping/checkout_spec.rb

@@ -113,6 +113,24 @@ feature "As a consumer I want to check out my cart", js: true, retry: 3 do
         user.reload.bill_address.address1.should eq '123 Your Head'
         user.reload.ship_address.address1.should eq '123 Your Head'
       end
+
+      it "it doesn't tell about previous orders" do
+        expect(page).to_not have_content("You have an order for this order cycle already.")
+      end
+
+      context "with previous orders" do
+        let!(:prev_order) { create(:completed_order_with_totals, order_cycle: order_cycle, distributor: distributor, user: order.user) }
+
+        before do
+          order.distributor.allow_order_changes = true
+          order.distributor.save
+        end
+
+        it "informs about previous orders" do
+          visit checkout_path
+          expect(page).to have_content("You have an order for this order cycle already.")
+        end
+      end
     end
 
     context "on the checkout page" do