[v3.3] Allow to disable track inventory for product without variants

backend/app/views/spree/admin/products/_form.html.erb

@@ -142,7 +142,14 @@
             </div>
           <% end %>
         </div>
-
+        <div data-hook="admin_product_form_track_inventory">
+          <%= f.field_container :track_inventory do %>
+            <label>
+              <%= f.check_box :track_inventory %>
+              <%= Spree::Variant.human_attribute_name(:track_inventory) %>
+            </label>
+          <% end %>
+        </div>
       <% end %>
 
       <div data-hook="admin_product_form_shipping_categories">

backend/spec/features/admin/products/products_spec.rb

@@ -270,6 +270,13 @@ def build_option_type_with_values(name, values)
       it "should show default tax category" do
         expect(page).to have_select('product_tax_category_id', selected: 'Alcohol taxes')
       end
+
+      it "can disable track_inventory" do
+        expect(page).to have_field("product_track_inventory", checked: true)
+        uncheck "product_track_inventory"
+        click_button "Create"
+        expect(page).to have_field("product_track_inventory", checked: false)
+      end
     end
 
     context "cloning a product", js: true do
@@ -343,6 +350,23 @@ def build_option_type_with_values(name, values)
           end
         end
       end
+
+      it "can disable track_inventory" do
+        visit spree.admin_product_path(product)
+        expect(page).to have_field("product_track_inventory", checked: true)
+        uncheck "product_track_inventory"
+        click_button "Update"
+        expect(page).to have_field("product_track_inventory", checked: false)
+      end
+
+      context "with variants" do
+        let(:product) { create(:variant).product }
+
+        it "cannot disable track_inventory" do
+          visit spree.admin_product_path(product)
+          expect(page).to_not have_field("product_track_inventory")
+        end
+      end
     end
 
     context 'deleting a product', js: true do

core/app/models/spree/product.rb

@@ -83,6 +83,7 @@ def find_or_build_master
       :height,
       :price,
       :sku,
+      :track_inventory,
       :weight,
       :width,
     ]

core/spec/models/spree/product_spec.rb

@@ -653,4 +653,22 @@ class Extension < Spree::Base
       end
     end
   end
+
+  describe "inventory tracking" do
+    let(:product) { build(:product) }
+
+    describe "#track_inventory=" do
+      it "delegates to master variant" do
+        expect(product.master).to receive(:track_inventory=).with(true)
+        product.track_inventory = true
+      end
+    end
+
+    describe "#track_inventory" do
+      it "delegates to master variant" do
+        expect(product.master).to receive(:track_inventory) { true }
+        expect(product.track_inventory).to be(true)
+      end
+    end
+  end
 end