nfujiu

app/controllers/dashboard/orders_controller.rb

@@ -1,4 +1,6 @@
 class Dashboard::OrdersController < ApplicationController
+  include OrderInputHandler
+
   def index
     @orders = Order.includes(:item, :reservation, :user).order(created_at: :desc)
   end
@@ -16,6 +18,19 @@ def new
   end
 
   def create
-    # Write Code Here
+    order, payment = build_order_and_payment
+
+    ActiveRecord::Base.transaction do
+      payment.pay!(token:) &&
+        order.save! &&
+        order.reservation.completed! &&
+        order.item.decrease_stock
+    end
+
+    redirect_to dashboard_orders_path, notice: "注文が作成されました"
   end
+
+  private
+
+  def token = params.dig(:order, :token)
 end

app/models/concerns/order_input_handler.rb

@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+module OrderInputHandler
+  def build_order_and_payment
+    order = reservation.build_order
+    order.assign_attributes(params.expect(order: %i[email name item_id user_id]))
+    payment = order.build_payment
+    payment.assign_attributes(amount: order.item.price)
+
+    [ order, payment ]
+  end
+
+  private
+
+  def reservation = Reservation.find(params.dig(:order, :reservation_id))
+
+  def reservation_id = params.dig(:order, :reservation_id)
+end

app/models/item.rb

@@ -4,4 +4,6 @@ class Item < ApplicationRecord
   validates :name, presence: true
   validates :stock, presence: true, numericality: { greater_than_or_equal_to: 0 }
   validates :price, presence: true, numericality: { greater_than: 0 }
+
+  def decrease_stock = self.stock -= 1
 end

app/models/order.rb

@@ -6,4 +6,9 @@ class Order < ApplicationRecord
 
   validates :email, presence: true
   validates :name, presence: true
+
+  before_validation do
+    self.email = reservation&.email
+    self.name = item&.name
+  end
 end

app/models/payment.rb

@@ -3,4 +3,11 @@ class Payment < ApplicationRecord
 
   validates :payment_id, presence: true
   validates :amount, presence: true, numericality: { greater_than: 0 }
+
+  def pay!(token:)
+    results = PaymentApiClient.execute(token:, amount:)
+    self.payment_id = results[:payment_id]
+
+    save!
+  end
 end