Restore old pagination API for products

It's still used by the inventory page. This is an easy fix that I can
deploy without risk. A rewrite of the inventory pagination should
follow.

.rubocop_manual_todo.yml

@@ -481,63 +481,26 @@ Metrics/AbcSize:
 
 Metrics/BlockLength:
   Max: 25
-  ExcludedMethods: ["class_eval", "collection", "context", "describe", "it", "member", "namespace", "resource", "resources"]
+  ExcludedMethods: [
+    "class_eval",
+    "collection",
+    "context",
+    "describe",
+    "feature",
+    "it",
+    "member",
+    "namespace",
+    "resource",
+    "resources",
+    "scenario"
+  ]
   Exclude:
   - lib/tasks/data.rake
   - lib/tasks/dev.rake
   - spec/controllers/spree/admin/invoices_controller_spec.rb
   - spec/factories/variant_factory.rb
-  - spec/features/admin/adjustments_spec.rb
-  - spec/features/admin/bulk_order_management_spec.rb
-  - spec/features/admin/bulk_product_update_spec.rb
-  - spec/features/admin/caching_spec.rb
-  - spec/features/admin/content_spec.rb
-  - spec/features/admin/customers_spec.rb
-  - spec/features/admin/enterprise_fees_spec.rb
-  - spec/features/admin/enterprise_groups_spec.rb
-  - spec/features/admin/enterprise_relationships_spec.rb
-  - spec/features/admin/enterprise_roles_spec.rb
-  - spec/features/admin/enterprises/images_spec.rb
-  - spec/features/admin/enterprises/index_spec.rb
-  - spec/features/admin/enterprises_spec.rb
-  - spec/features/admin/enterprise_user_spec.rb
-  - spec/features/admin/multilingual_spec.rb
-  - spec/features/admin/order_cycles_spec.rb
   - spec/features/admin/orders_spec.rb
-  - spec/features/admin/overview_spec.rb
-  - spec/features/admin/payment_method_spec.rb
-  - spec/features/admin/product_import_spec.rb
-  - spec/features/admin/products_spec.rb
-  - spec/features/admin/reports/enterprise_fee_summaries_spec.rb
-  - spec/features/admin/reports_spec.rb
-  - spec/features/admin/schedules_spec.rb
-  - spec/features/admin/shipping_methods_spec.rb
-  - spec/features/admin/subscriptions_spec.rb
-  - spec/features/admin/tag_rules_spec.rb
-  - spec/features/admin/tax_settings_spec.rb
-  - spec/features/admin/users_spec.rb
-  - spec/features/admin/variant_overrides_spec.rb
-  - spec/features/admin/variants_spec.rb
-  - spec/features/consumer/account/cards_spec.rb
-  - spec/features/consumer/account/settings_spec.rb
-  - spec/features/consumer/account_spec.rb
-  - spec/features/consumer/authentication_spec.rb
-  - spec/features/consumer/cookies_spec.rb
-  - spec/features/consumer/external_services_spec.rb
-  - spec/features/consumer/groups_spec.rb
-  - spec/features/consumer/multilingual_spec.rb
-  - spec/features/consumer/producers_spec.rb
-  - spec/features/consumer/registration_spec.rb
-  - spec/features/consumer/shopping/cart_spec.rb
-  - spec/features/consumer/shopping/checkout_auth_spec.rb
-  - spec/features/consumer/shopping/checkout_spec.rb
-  - spec/features/consumer/shopping/embedded_groups_spec.rb
   - spec/features/consumer/shopping/embedded_shopfronts_spec.rb
-  - spec/features/consumer/shopping/orders_spec.rb
-  - spec/features/consumer/shopping/products_spec.rb
-  - spec/features/consumer/shopping/shopping_spec.rb
-  - spec/features/consumer/shopping/variant_overrides_spec.rb
-  - spec/features/consumer/shops_spec.rb
   - spec/lib/open_food_network/group_buy_report_spec.rb
   - spec/models/tag_rule/discount_order_spec.rb
   - spec/spec_helper.rb

.rubocop_styleguide.yml

@@ -186,7 +186,19 @@ Metrics/AbcSize:
 
 Metrics/BlockLength:
   Max: 25
-  ExcludedMethods: ["class_eval", "collection", "context", "describe", "it", "member", "namespace", "resource", "resources"]
+  ExcludedMethods: [
+    "class_eval",
+    "collection",
+    "context",
+    "describe",
+    "feature",
+    "it",
+    "member",
+    "namespace",
+    "resource",
+    "resources",
+    "scenario"
+  ]
 
 Metrics/BlockNesting:
   Max: 3

app/controllers/api/products_controller.rb

@@ -127,6 +127,9 @@ module Api
 
       render text: {
         products: serializer,
+        # This line is used by the PagedFetcher JS service (inventory).
+        pages: products.num_pages,
+        # This hash is used by the BulkProducts JS service.
         pagination: pagination_data(products)
       }.to_json
     end

spec/features/admin/inventory_spec.rb

@@ -0,0 +1,34 @@
+require "spec_helper"
+
+feature "Managing inventory", js: true do
+  include AdminHelper
+  include AuthenticationWorkflow
+  include WebHelper
+
+  it "shows more than 100 products" do
+    supplier = create(:supplier_enterprise, sells: "own")
+    inventory_items = (1..101).map do
+      product = create(:simple_product, supplier: supplier)
+      InventoryItem.create!(
+        enterprise: supplier,
+        variant: product.variants.first,
+        visible: true
+      )
+    end
+    first_variant = inventory_items.first.variant
+    last_variant = inventory_items.last.variant
+    first_variant.product.update_attributes!(name: "A First Product")
+    last_variant.product.update_attributes!(name: "Z Last Product")
+    quick_login_as supplier.users.first
+    visit admin_inventory_path
+
+    expect(page).to have_text first_variant.name
+    expect(page).to have_selector "tr.product", count: 10
+    expect(page).to have_button "Show more"
+    expect(page).to have_button "Show all (91  More)"
+
+    click_button "Show all (91  More)"
+    expect(page).to have_selector "tr.product", count: 101
+    expect(page).to have_text last_variant.name
+  end
+end