diff --git a/app/controllers/admin/lunchboxes_controller.rb b/app/controllers/admin/lunchboxes_controller.rb
index 9b3403b..7e792c7 100644
--- a/app/controllers/admin/lunchboxes_controller.rb
+++ b/app/controllers/admin/lunchboxes_controller.rb
@@ -32,10 +32,14 @@ def create
 
   # PATCH/PUT /lunchboxes/1
   def update
+
     if @lunchbox.update(lunchbox_params)
       redirect_to admin_lunchboxes_path, notice: 'Lunchbox was successfully updated.'
     else
-      render :edit
+      puts("#########")
+      puts("#########")
+      puts("#########")
+      render :edit, notice: '更新できませんでした'
     end
   end
 
diff --git a/app/models/lunchbox.rb b/app/models/lunchbox.rb
index 4a28630..2de43c0 100644
--- a/app/models/lunchbox.rb
+++ b/app/models/lunchbox.rb
@@ -10,4 +10,27 @@
 #
 
 class Lunchbox < ApplicationRecord
+  has_many :order_items
+  has_many :orders, through: :order_items
+
+  # validation
+
+  validate :prevent_future_reserved_lunchbox, on: :update
+
+  private
+    def prevent_future_reserved_lunchbox
+      # 弁当に紐づくオーダーを取ってくる
+      # 未来日のオーダーに自分が含まれているかを確認
+      # 含まれている場合は更新させない
+      # puts orders.where("date > ?", Date.current).present?
+      # puts orders.first.date
+      # puts self.name
+      # puts Date.current
+      # puts"###################"
+
+      if orders.where("date > ?", Date.current).present?
+        errors.add(:future_date, "未来日に予約された弁当は更新できません")
+      end
+    end
+
 end
diff --git a/spec/features/admin/prevent_update_future_reserved_lunchbox_spec.rb b/spec/features/admin/prevent_update_future_reserved_lunchbox_spec.rb
new file mode 100644
index 0000000..6cd16a8
--- /dev/null
+++ b/spec/features/admin/prevent_update_future_reserved_lunchbox_spec.rb
@@ -0,0 +1,21 @@
+require 'rails_helper'
+
+RSpec.feature '未来日に予約されている弁当の更新を行う時にエラーにする', type: :feature do
+  given!(:order) { create(:order, date: Time.zone.local(2017, 2, 4)) }
+  given!(:lunchbox) { create(:lunchbox) }
+
+  scenario '未来日に予約を入れた状態で、その弁当を更新する' do
+    Timecop.freeze(Time.zone.local(2017, 2, 1)) do
+      create(:order_item, lunchbox_id: lunchbox.id, order: order)
+
+      visit edit_admin_lunchbox_path(lunchbox)
+
+      fill_in 'Name', with: "new_lunchbox_name"
+
+      click_button('Update Lunchbox')
+
+      expect(page).to have_text('未来日に予約された弁当は更新できません')
+      # expect(page).not_to have_text('new_lunchbox_name')
+    end
+  end
+end