カート内が空の時にはurl直打ちで次に飛べないようにしたい

今ECサイトを作っているのですが、カート内が空の時にはurl直打ちで遷移できないようにしようと思い、メソッドを作ったところ今度はからじゃなくても遷移しなくなってしまいました

orders_controller
1class Public::OrdersController < ApplicationController
2  before_action :authenticate_customer!
3  before_action :correct_cart
4
5  def index
6  end
7
8  def show
9  end
10
11  def new
12    @order = Order.new
13    @customer = current_customer
14    @addresses = current_customer.addresses
15  end
16
17  def create
18    @order = Order.new(order_params)
19    @order.customer_id = current_customer.id
20    if @order.save
21      @cart_items = current_customer.cart_items
22      @cart_items.each do |cart_item|
23        order_detail = OrderDetail.new(order_id: @order.id)
24        order_detail.price = cart_item.item.price
25        order_detail.amount = cart_item.amount
26        order_detail.item_id = cart_item.item_id
27        order_detail.save
28      end
29      @cart_items.destroy_all
30      redirect_to orders_complete_path
31    else
32      render "new"
33    end
34  end
35
36  def confirm
37    @cart_items = current_customer.cart_items
38    @order = Order.new(order_params)
39    @order.customer_id = current_customer.id
40    @order.payment_method = params[:order][:payment_method]
41    @total_payment = current_customer.cart_items.cart_items_total_price(@cart_items)
42    @order.shipping_cost = 800
43
44    if params[:order][:address_option] == "0"
45      @order.postal_code = current_customer.postal_code
46      @order.address = current_customer.address
47      @order.name = current_customer.full_name_a
48      render 'confirm'
49    elsif params[:order][:address_option] == "1"
50      @address = Address.find(params[:order][:address_id])
51      @order.postal_code = @address.postal_code
52      @order.address = @address.address
53      @order.name = @address.name
54      render 'confirm'
55    elsif params[:order][:address_option] == "2"
56      @address = current_customer.addresses.new
57      @address.address = params[:order][:address]
58      @address.name = params[:order][:name]
59      @address.postal_code = params[:order][:postal_code]
60      @address.customer_id = current_customer.id
61      if @address.save
62      @order.postal_code = @address.postal_code
63      @order.name = @address.name
64      @order.address = @address.address
65      else
66        render 'new'
67      end
68    end
69  end
70
71  def complete
72
73  end
74
75  private
76
77  def order_params
78    params.require(:order).permit(:postal_code,:address, :name, :shipping_cost,
79      :address, :total_payment, :payment_method, :status)
80  end
81
82  def address_params
83    params.require(:address).permit(:customer_id, :name, :postal_code, :address)
84  end
85
86  def correct_cart
87    @cart_items = current_customer.cart_items
88    unless @cart_items.size == 0
89      redirect_to cart_items_path, notice: "カート内は空です"
90    end
91  end
92end