Implement order create

Gemfile

@@ -50,6 +50,7 @@ end
 group :development do
   # Use console on exceptions pages [https://github.com/rails/web-console]
   gem "web-console"
+  gem "pry"
 end
 
 group :test do

Gemfile.lock

@@ -99,6 +99,7 @@ GEM
       rack-test (>= 0.6.3)
       regexp_parser (>= 1.5, < 3.0)
       xpath (~> 3.2)
+    coderay (1.1.3)
     concurrent-ruby (1.3.5)
     connection_pool (2.5.4)
     crass (1.0.6)
@@ -145,6 +146,7 @@ GEM
       net-smtp
     marcel (1.1.0)
     matrix (0.4.3)
+    method_source (1.1.0)
     mini_mime (1.1.5)
     minitest (5.26.2)
     msgpack (1.8.0)
@@ -186,6 +188,9 @@ GEM
       actionpack (>= 7.0.0)
       activesupport (>= 7.0.0)
       rack
+    pry (0.15.2)
+      coderay (~> 1.1)
+      method_source (~> 1.0)
     psych (5.2.6)
       date
       stringio
@@ -355,6 +360,7 @@ DEPENDENCIES
   importmap-rails
   jbuilder
   propshaft
+  pry
   puma (>= 5.0)
   rails (~> 8.1.0)
   rubocop-rails-omakase

app/controllers/dashboard/orders_controller.rb

@@ -11,11 +11,34 @@ def new
       name: reservation.name,
       user: Current.user
     )
+    new_resources_setup
+  end
+
+  def create
+    reservation = Reservation.find(params.dig(:order, :reservation_id))
+    item = Item.find(params.dig(:order, :item_id))
+    @order = Order.new(order_params(reservation, item))
+
+    if @order.save
+      redirect_to dashboard_orders_path, notice: '注文が作成されました'
+    else
+      new_resources_setup
+      # TODO: 画面でいい感じに表示されるようにする
+      flash.alert.now = @order.errors.full_messages
+      render :new, status: :unprocessable_entity
+    end
+  end
+
+  private
+
+  def new_resources_setup
     @items = Item.all.order(:name)
     @users = User.all.order(:name)
   end
 
-  def create
-    # Write Code Here
+  def order_params(reservation, item)
+    params.require(:order)
+      .permit(:reservation_id, :user_id, :item_id, :email, :name, :item_id)
+      .merge(name: item.name, email: reservation.email)
   end
 end