Prevent empty order submission

ecommerce/ordering/lib/ordering/order.rb

@@ -6,6 +6,7 @@ class Order
     AlreadySubmitted = Class.new(InvalidState)
     NotPlaced = Class.new(InvalidState)
     OrderHasExpired = Class.new(InvalidState)
+    IsEmpty = Class.new(StandardError)
 
     def initialize(id)
       @id = id
@@ -16,6 +17,7 @@ def initialize(id)
     def submit(order_number)
       raise OrderHasExpired if @state.expired?
       raise AlreadySubmitted unless @state.draft?
+      raise IsEmpty if @basket.empty?
       apply OrderSubmitted.new(
         data: {
           order_id: @id,
@@ -111,6 +113,10 @@ def order_lines
       def quantity(product_id)
         order_lines[product_id]
       end
+
+      def empty?
+        order_lines.empty?
+      end
     end
 
     class State

ecommerce/ordering/test/order_test.rb

@@ -11,12 +11,14 @@ def setup
       @customer_id = SecureRandom.uuid
     end
 
-    def test_order_lines_are_empty_after_adding_and_removing
+    def test_order_is_empty_after_adding_and_removing
       order = Order.new(@order_id)
       order.add_item(@product_id)
       order.remove_item(@product_id)
-      order.submit(NumberGenerator.new.call)
-      assert_equal({}, order.unpublished_events.to_a.last.data[:order_lines])
+
+      assert_raises(Order::IsEmpty) do
+        order.submit(NumberGenerator.new.call)
+      end
     end
 
     def test_order_lines_with_the_same_product_twice

ecommerce/ordering/test/submit_order_test.rb

@@ -71,5 +71,13 @@ def test_expired_order_could_not_be_created
         act(SubmitOrder.new(order_id: aggregate_id))
       end
     end
+
+    def test_empty_order_cannot_be_submitted
+      aggregate_id = SecureRandom.uuid
+
+      assert_raises(Order::IsEmpty) do
+        act(SubmitOrder.new(order_id: aggregate_id))
+      end
+    end
   end
 end

rails_application/app/controllers/client/orders_controller.rb

@@ -12,10 +12,13 @@ def new
     end
 
     def create
-      command_bus.(Ordering::SubmitOrder.new(order_id: params[:order_id]))
-      command_bus.(Crm::AssignCustomerToOrder.new(customer_id: cookies[:client_id], order_id: params[:order_id]))
-      redirect_to client_order_path(params[:order_id]),
-                  notice: "Your order is being submitted"
+      ActiveRecord::Base.transaction do
+        command_bus.(Ordering::SubmitOrder.new(order_id: params[:order_id]))
+        command_bus.(Crm::AssignCustomerToOrder.new(customer_id: cookies[:client_id], order_id: params[:order_id]))
+      end
+      redirect_to client_order_path(params[:order_id]), notice: "Your order is being submitted"
+    rescue Ordering::Order::IsEmpty
+      redirect_to edit_client_order_path(params[:order_id]), alert: "You can't submit an empty order"
     end
 
     def show

rails_application/app/controllers/orders_controller.rb

@@ -76,6 +76,8 @@ def remove_item
   def create
     ApplicationRecord.transaction { submit_order(params[:order_id], params[:customer_id]) }
     redirect_to order_path(params[:order_id]), notice: "Your order is being submitted"
+  rescue Ordering::Order::IsEmpty
+    redirect_to edit_order_path(params[:order_id]), alert: "You can't submit an empty order"
   rescue Crm::Customer::NotExists
     redirect_to order_path(params[:order_id]), alert: "Order can not be submitted! Customer does not exist."
   end

rails_application/test/client_orders/order_cancelled_test.rb

@@ -15,6 +15,7 @@ def test_order_confirmed
       customer_id = SecureRandom.uuid
       order_id = SecureRandom.uuid
       order_number = Ordering::FakeNumberGenerator::FAKE_NUMBER
+      product_id = SecureRandom.uuid
 
       event_store.publish(Crm::CustomerRegistered.new(
         data: {
@@ -23,6 +24,8 @@ def test_order_confirmed
         }
       ))
 
+      create_product(product_id, "Async Remote", 30)
+      run_command(Ordering::AddItemToBasket.new(order_id: order_id, product_id: product_id))
       run_command(Ordering::SubmitOrder.new(order_id: order_id, order_number: order_number))
 
       event_store.publish(
@@ -39,5 +42,13 @@ def test_order_confirmed
       assert_equal(order_number, orders.first.number)
       assert_equal("Cancelled",  orders.first.state)
     end
+
+    private
+
+    def create_product(product_id, name, price)
+      run_command(ProductCatalog::RegisterProduct.new(product_id: product_id))
+      run_command(ProductCatalog::NameProduct.new(product_id: product_id, name: name))
+      run_command(Pricing::SetPrice.new(product_id: product_id, price: price))
+    end
   end
-end
+end

rails_application/test/client_orders/order_paid_test.rb

@@ -15,8 +15,11 @@ def test_order_confirmed
       customer_id = SecureRandom.uuid
       order_id = SecureRandom.uuid
       order_number = Ordering::FakeNumberGenerator::FAKE_NUMBER
+      product_id = SecureRandom.uuid
 
       run_command(Crm::RegisterCustomer.new(customer_id: customer_id, name: "John Doe"))
+      create_product(product_id, "Async Remote", 30)
+      run_command(Ordering::AddItemToBasket.new(order_id: order_id, product_id: product_id))
 
       event_store.publish(
         Pricing::OrderTotalValueCalculated.new(
@@ -48,5 +51,13 @@ def test_order_confirmed
       assert_equal(order_number, orders.first.number)
       assert_equal("Paid",  orders.first.state)
     end
+
+    private
+
+    def create_product(product_id, name, price)
+      run_command(ProductCatalog::RegisterProduct.new(product_id: product_id))
+      run_command(ProductCatalog::NameProduct.new(product_id: product_id, name: name))
+      run_command(Pricing::SetPrice.new(product_id: product_id, price: price))
+    end
   end
 end

rails_application/test/client_orders/update_paid_orders_summary_test.rb

@@ -9,21 +9,26 @@ def setup
       Client.destroy_all
     end
 
-    def test_update_orders_cummary
-      event_store = Rails.configuration.event_store
+    def test_update_orders_summary
       customer_id = SecureRandom.uuid
       other_customer_id = SecureRandom.uuid
       product_id = SecureRandom.uuid
       order_id = SecureRandom.uuid
 
+      register_product(product_id)
+      name_product(product_id, "Async Remote")
+      set_price_to_product(product_id, 3)
       register_customer(other_customer_id)
       register_customer(customer_id)
+      add_item_to_basket(order_id, product_id)
       confirm_order(customer_id, order_id, 3)
 
       customer = Client.find_by(uid: customer_id)
       assert_equal 3.to_d, customer.paid_orders_summary
 
       order_id = SecureRandom.uuid
+      add_item_to_basket(order_id, product_id)
+      add_item_to_basket(order_id, product_id)
       confirm_order(customer_id, order_id, 6)
 
       customer = Client.find_by(uid: customer_id)
@@ -36,6 +41,27 @@ def register_customer(customer_id)
       run_command(Crm::RegisterCustomer.new(customer_id: customer_id, name: "John Doe"))
     end
 
+    def register_product(product_id)
+      run_command(ProductCatalog::RegisterProduct.new(product_id: product_id))
+    end
+
+    def name_product(product_id, name)
+      run_command(
+        ProductCatalog::NameProduct.new(
+          product_id: product_id,
+          name: name
+        )
+      )
+    end
+
+    def set_price_to_product(product_id, price)
+      run_command(Pricing::SetPrice.new(product_id: product_id, price: price))
+    end
+
+    def add_item_to_basket(order_id, product_id)
+      run_command(Ordering::AddItemToBasket.new(order_id: order_id, product_id: product_id))
+    end
+
     def confirm_order(customer_id, order_id, total_amount)
       order_number = Ordering::FakeNumberGenerator::FAKE_NUMBER
       event_store.publish(

rails_application/test/customers/update_paid_orders_summary_test.rb

@@ -13,15 +13,22 @@ def test_update_orders_summary
       customer_id = SecureRandom.uuid
       other_customer_id = SecureRandom.uuid
       order_id = SecureRandom.uuid
+      product_id = SecureRandom.uuid
 
       register_customer(other_customer_id)
       register_customer(customer_id)
+      register_product(product_id)
+      name_product(product_id, "Async Remote")
+      set_price_to_product(product_id, 3)
+      add_item_to_basket(order_id, product_id)
       confirm_order(customer_id, order_id, 3)
 
       customer = Customer.find(customer_id)
       assert_equal 3.to_d, customer.paid_orders_summary
 
       order_id = SecureRandom.uuid
+      add_item_to_basket(order_id, product_id)
+      add_item_to_basket(order_id, product_id)
       confirm_order(customer_id, order_id, 6)
 
       customer = Customer.find(customer_id)
@@ -34,6 +41,22 @@ def register_customer(customer_id)
       run_command(Crm::RegisterCustomer.new(customer_id: customer_id, name: "John Doe"))
     end
 
+    def register_product(product_id)
+      run_command(ProductCatalog::RegisterProduct.new(product_id: product_id))
+    end
+
+    def name_product(product_id, name)
+      run_command(ProductCatalog::NameProduct.new(product_id: product_id, name: "Async Remote"))
+    end
+
+    def set_price_to_product(product_id, price)
+      run_command(Pricing::SetPrice.new(product_id: product_id, price: price))
+    end
+
+    def add_item_to_basket(order_id, product_id)
+      run_command(Ordering::AddItemToBasket.new(order_id: order_id, product_id: product_id))
+    end
+
     def confirm_order(customer_id, order_id, total_amount)
       order_number = Ordering::FakeNumberGenerator::FAKE_NUMBER
       event_store.publish(

rails_application/test/integration/client_orders_test.rb

@@ -154,6 +154,20 @@ def test_adding_product_which_is_not_available_in_requested_quantity
     assert_equal "Product not available in requested quantity!", flash[:alert]
   end
 
+  def test_empty_order_cannot_be_submitted
+    customer_id = register_customer("Customer Shop")
+
+    login(customer_id)
+    visit_client_orders
+
+    order_id = SecureRandom.uuid
+    assert_no_changes -> { ClientOrders::Order.count } do
+      as_client_submit_order_for_customer(order_id)
+    end
+
+    assert_select "#alert", "You can't submit an empty order"
+  end
+
   private
 
   def submit_order_for_customer(customer_id, order_id)

rails_application/test/integration/orders_test.rb

@@ -8,23 +8,6 @@ def setup
     add_available_vat_rate(10)
   end
 
-  def test_submitting_empty_order
-    arkency_id = register_customer("Arkency")
-
-    get "/"
-    assert_select "h1", "Orders"
-    get "/orders/new"
-    follow_redirect!
-    assert_select "h1", "Order"
-    post "/orders",
-         params: {
-           "authenticity_token" => "[FILTERED]",
-           "order_id" => SecureRandom.uuid,
-           "customer_id" => arkency_id,
-           "commit" => "Submit order"
-         }
-  end
-
   def test_happy_path
     shopify_id = register_customer("Shopify")
 
@@ -202,6 +185,24 @@ def test_discount_is_applied_for_new_order
     assert_select("td", "10.0%")
   end
 
+  def test_empty_order_cannot_be_submitted
+    order_id = SecureRandom.uuid
+    shopify_id = register_customer("Shopify")
+
+    assert_no_changes -> { Orders::Order.count } do
+      post "/orders",
+            params: {
+              "authenticity_token" => "[FILTERED]",
+              "order_id" => order_id,
+              "customer_id" => shopify_id,
+              "commit" => "Submit order"
+            }
+    end
+    follow_redirect!
+
+    assert_select "#alert", "You can't submit an empty order"
+  end
+
   private
 
   def assert_remove_buttons_visible(async_remote_id, fearless_id, order_id)

rails_application/test/orders/order_cancelled_test.rb

@@ -15,6 +15,7 @@ def test_cancel_confirmed_order
       customer_id = SecureRandom.uuid
       order_id = SecureRandom.uuid
       order_number = Ordering::FakeNumberGenerator::FAKE_NUMBER
+      product_id = SecureRandom.uuid
 
       event_store.publish(Crm::CustomerRegistered.new(
         data: {
@@ -23,6 +24,8 @@ def test_cancel_confirmed_order
         }
       ))
 
+      create_product(product_id, "Async Remote", 30)
+      run_command(Ordering::AddItemToBasket.new(order_id: order_id, product_id: product_id))
       run_command(Ordering::SubmitOrder.new(order_id: order_id, order_number: order_number))
 
       order_cancelled = Fulfillment::OrderCancelled.new(
@@ -40,5 +43,13 @@ def test_cancel_confirmed_order
       assert_equal("Cancelled", orders.first.state)
       assert event_store.event_in_stream?(order_cancelled.event_id, "Orders$all")
     end
+
+    private
+
+    def create_product(product_id, name, price)
+      run_command(ProductCatalog::RegisterProduct.new(product_id: product_id))
+      run_command(ProductCatalog::NameProduct.new(product_id: product_id, name: name))
+      run_command(Pricing::SetPrice.new(product_id: product_id, price: price))
+    end
   end
-end
+end

rails_application/test/orders/order_paid_test.rb

@@ -15,8 +15,11 @@ def test_order_confirmed
       customer_id = SecureRandom.uuid
       order_id = SecureRandom.uuid
       order_number = Ordering::FakeNumberGenerator::FAKE_NUMBER
+      product_id = SecureRandom.uuid
 
+      create_product(product_id, "Async Remote", 10)
       run_command(Crm::RegisterCustomer.new(customer_id: customer_id, name: "John Doe"))
+      run_command(Ordering::AddItemToBasket.new(order_id: order_id, product_id: product_id))
       run_command(Ordering::SubmitOrder.new(order_id: order_id, order_number: order_number))
       run_command(
         Crm::AssignCustomerToOrder.new(customer_id: customer_id, order_id: order_id)
@@ -37,5 +40,13 @@ def test_order_confirmed
       assert_equal("Paid", orders.first.state)
       assert event_store.event_in_stream?(order_confirmed.event_id, "Orders$all")
     end
+
+    private
+
+    def create_product(product_id, name, price)
+      run_command(ProductCatalog::RegisterProduct.new(product_id: product_id))
+      run_command(ProductCatalog::NameProduct.new(product_id: product_id, name: name))
+      run_command(Pricing::SetPrice.new(product_id: product_id, price: price))
+    end
   end
-end
+end