12570 - Fix Variant Unit field is Out of Sync with the Pop-out

app/helpers/admin/products_helper.rb

@@ -9,5 +9,23 @@ def product_image_form_path(product)
         new_admin_product_image_path(product.id)
       end
     end
+
+    def prepare_new_variant(product)
+      product.variants.build do |variant|
+        variant.unit_value = 1.0 * (product.variant_unit_scale || 1)
+        variant.unit_presentation = VariantUnits::OptionValueNamer.new(variant).name
+      end
+    end
+
+    def unit_value_with_description(variant)
+      scaled_unit_value = variant.unit_value / (variant.product.variant_unit_scale || 1)
+      precised_unit_value = number_with_precision(
+        scaled_unit_value,
+        precision: nil,
+        strip_insignificant_zeros: true
+      )
+
+      [precised_unit_value, variant.unit_description].compact_blank.join(" ")
+    end
   end
 end

app/views/admin/products_v3/_product_variant_row.html.haml

@@ -11,7 +11,7 @@
         %tr.condensed{ id: dom_id(variant), 'data-controller': "variant", 'class': "nested-form-wrapper", 'data-new-record': variant.new_record? ? "true" : false }
           = render partial: 'variant_row', locals: { variant:, f: variant_form, category_options:, tax_category_options:, producer_options: }
 
-    = form.fields_for("products][#{product_index}][variants_attributes][NEW_RECORD", product.variants.build) do |new_variant_form|
+    = form.fields_for("products][#{product_index}][variants_attributes][NEW_RECORD", prepare_new_variant(product)) do |new_variant_form|
       %template{ 'data-nested-form-target': "template" }
         %tr.condensed{ 'data-controller': "variant", 'class': "nested-form-wrapper", 'data-new-record': "true" }
           = render partial: 'variant_row', locals: { variant: new_variant_form.object, f: new_variant_form, category_options:, tax_category_options:, producer_options: }

app/views/admin/products_v3/_variant_row.html.haml

@@ -17,10 +17,8 @@
       -# Show a composite field for unit_value and unit_description
       = f.hidden_field :unit_value
       = f.hidden_field :unit_description
-      -# todo: create a method for value_with_description
       = f.text_field :unit_value_with_description,
-          value: [number_with_precision((variant.unit_value || 1) / (variant.product.variant_unit_scale || 1), precision: nil, strip_insignificant_zeros: true), variant.unit_description].compact_blank.join(" "),
-          'aria-label': t('admin.products_page.columns.unit_value'), required: true
+          value: unit_value_with_description(variant), 'aria-label': t('admin.products_page.columns.unit_value'), required: true
     .field
       = f.label :display_as, t('admin.products_page.columns.display_as')
       = f.text_field :display_as, placeholder: VariantUnits::OptionValueNamer.new(variant).name

spec/system/admin/products_v3/create_spec.rb

@@ -39,12 +39,24 @@
     before { visit_products_page_as_admin }
 
     it "hovering over the New variant button displays the text" do
-      page.find('button[aria-label="New variant"]', text: "New variant", visible: false)
+      new_variant_button
       find("button.secondary.condensed.naked.icon-plus").hover
-      page.find('button[aria-label="New variant"]', text: "New variant", visible: true)
+      new_variant_button(visible: true)
       expect(page).to have_content "New variant"
     end
 
+    it "has the 1 unit value for the new variant display_as by default" do
+      new_variant_button.click
+
+      within new_variant_row do
+        unit_button = find('button[aria-label="Unit"]')
+        expect(unit_button.text.strip).to eq('1kg')
+
+        unit_button.click
+        expect(page).to have_field "Display unit as", placeholder: "1kg"
+      end
+    end
+
     shared_examples "creating a new variant (bulk)" do |stock|
       it "handles the #{stock} behaviour" do
         # the product and the default variant is displayed
@@ -120,4 +132,12 @@ def visit_products_page_as_admin
     login_as_admin
     visit spree.admin_products_path
   end
+
+  def new_variant_button(visible: false)
+    page.find('button[aria-label="New variant"]', text: "New variant", visible:)
+  end
+
+  def new_variant_row
+    'tr[data-new-record="true"]'
+  end
 end

spec/system/admin/products_v3/update_spec.rb

@@ -517,7 +517,6 @@
             expect(page).to have_field "SKU", with: "n" * 256
             expect(page).to have_content "is too long"
             expect(page.find_button("Unit")).to have_text "" # have_button selector don't work here
-            expect(page).to have_content "can't be blank"
             expect(page).to have_field "Price", with: "10.25" # other updated value is retained
           end