If an order has out of stock line items display them and let admins remove them

app/views/spree/admin/orders/_form.html.haml

@@ -2,6 +2,9 @@
   - if @line_item.try(:errors).present?
     = render :partial => 'spree/shared/error_messages', :locals => { :target => @line_item }
 
+  - if !@order.completed? && @order.insufficient_stock_lines.any?
+    = render 'spree/admin/orders/insufficient_stock_lines', insufficient_stock_lines: @order.insufficient_stock_lines
+
   = render :partial => "spree/admin/orders/shipment", :collection => @order.shipments, :locals => { :order => order }
 
   = render :partial => "spree/admin/orders/_form/adjustments", :locals => { :adjustments => @order.line_item_adjustments, :title => t(".line_item_adjustments")}

app/views/spree/admin/orders/_insufficient_stock_lines.html.haml

@@ -0,0 +1,39 @@
+%div.insufficient-stock-items
+  %fieldset.no-border-bottom
+    %legend
+      = t("spree.orders.line_item.out_of_stock")
+
+  %table
+    %colgroup
+      %col{ :style => "width: 10%;" }
+      %col{ :style => "width: 30%;" }
+      %col{ :style => "width: 15%;" }
+      %col{ :style => "width: 15%;" }
+      %col{ :style => "width: 15%;" }
+      %col{ :style => "width: 15%;" }
+
+    %thead
+      %th{ :colspan => "2" }
+        = Spree.t(:item_description)
+      %th
+        = Spree.t(:price)
+      %th
+        = Spree.t(:quantity)
+      %th
+        = Spree.t(:total)
+      %th.orders-actions.actions
+
+    - insufficient_stock_lines.each do |line_item|
+      %tr.insufficient-stock-item
+        %td
+          = render 'spree/shared/variant_thumbnail', variant: line_item.variant
+        %td
+          = line_item.variant.product_and_full_name
+        %td.align-center
+          = line_item.single_money.to_html
+        %td.align-center
+          = line_item.quantity
+        %td.align-center
+          = line_item.money.to_html
+        %td.actions
+          = link_to_delete line_item, { url: main_app.admin_bulk_line_item_path(line_item), no_text: true }

app/webpacker/css/admin/sections/orders.scss

@@ -33,6 +33,16 @@
   }
 }
 
+.insufficient-stock-items {
+  legend {
+    color: $color-error;
+  }
+
+  table tr:last-child th {
+    border-bottom: 1px solid $admin-table-border;
+  }
+}
+
 // Customize orduct add fieldset
 #add-line-item {
   fieldset {

spec/system/admin/order_spec.rb

@@ -448,6 +448,27 @@ describe '
           end
         end
       end
+
+      context "when an incomplete order has some line items with insufficient stock" do
+        let(:incomplete_order) do
+          create(:order_with_line_items, user: user, distributor: distributor,
+                                         order_cycle: order_cycle)
+        end
+
+        it "displays the out of stock line items and they can be deleted from the order" do
+          incomplete_order.line_items.first.variant.update!(on_demand: false, on_hand: 0)
+
+          visit spree.edit_admin_order_path(incomplete_order)
+
+          within ".insufficient-stock-items" do
+            expect(page).to have_content incomplete_order.products.first.name
+            accept_alert 'Are you sure?' do
+              find("a.delete-resource").click
+            end
+            expect(page).to_not have_content incomplete_order.products.first.name
+          end
+        end
+      end
     end
 
     it "creating an order with distributor and order cycle" do

spec/views/spree/admin/orders/edit.html.haml_spec.rb

@@ -22,21 +22,76 @@ describe "spree/admin/orders/edit.html.haml" do
     end
 
     allow(view).to receive_messages spree_current_user: create(:user)
-
-    order = create(:completed_order_with_fees)
-    order.distributor = create(:distributor_enterprise)
-    assign(:order, order)
-    assign(:shops, [order.distributor])
-    assign(:order_cycles, [])
   end
 
-  describe "order values" do
-    it "displays order shipping costs, transaction fee and order total" do
-      render
+  context "when order is complete" do
+    let(:order) { create(:completed_order_with_fees) }
 
-      expect(rendered).to have_content("Shipping Method\nUPS Ground $6.00")
-      expect(rendered).to have_content("Transaction fee:\n\n$10.00")
-      expect(rendered).to have_content("Order Total\n$36.00")
+    before do
+      order.distributor = create(:distributor_enterprise)
+      assign(:order, order)
+      assign(:shops, [order.distributor])
+      assign(:order_cycles, [])
+    end
+
+    describe "order values" do
+      it "displays order shipping costs, transaction fee and order total" do
+        render
+
+        expect(rendered).to have_content("Shipping Method\nUPS Ground $6.00")
+        expect(rendered).to have_content("Transaction fee:\n\n$10.00")
+        expect(rendered).to have_content("Order Total\n$36.00")
+      end
+    end
+
+    context "when some line items are out of stock" do
+      let!(:out_of_stock_line_item) do
+        line_item = order.line_items.first
+        line_item.variant.update!(on_demand: false, on_hand: 0)
+        line_item
+      end
+
+      it "doesn't display a table of out of stock line items" do
+        render
+
+        expect(rendered).to_not have_content "Out of Stock"
+        expect(rendered).to_not have_selector ".insufficient-stock-items",
+                                              text: out_of_stock_line_item.variant.display_name
+      end
+    end
+  end
+
+  context "when order is incomplete" do
+    let(:order) { create(:order_with_line_items) }
+
+    before do
+      assign(:order, order)
+      assign(:shops, [order.distributor])
+      assign(:order_cycles, [])
+    end
+
+    context "when some line items are out of stock" do
+      let!(:out_of_stock_line_item) do
+        line_item = order.line_items.first
+        line_item.variant.update!(on_demand: false, on_hand: 0)
+        line_item
+      end
+
+      it "displays a table of out of stock line items" do
+        render
+
+        expect(rendered).to have_content "Out of Stock"
+        expect(rendered).to have_selector ".insufficient-stock-items",
+                                          text: out_of_stock_line_item.variant.display_name
+      end
+    end
+
+    context "when all line items are in stock" do
+      it "doesn't display a table of out of stock line items" do
+        render
+
+        expect(rendered).to_not have_content "Out of Stock"
+      end
     end
   end
 end