Rails Order 的未定义局部变量或方法“current_user”

Question

您好，当用户结账时，我的网站出现了问题。创建或登录用户时，所有用户都有一个购物车。应用程序控制器中包含的会话助手中有一个 current_user 实例。当用户将商品放入购物车后去下订单时，我看到错误 "undefined local variable or method 'current_user' for #" This is the code that is in the Order model

 def add_line_items_from_cart(cart)
    current_user.cart.line_items each do |item|
      item.cart_id = nil
      line_items << item
    end

我对此有点困惑，因为我认为 current_user.cart 会起作用。这是我的订单控制器

class OrdersController < ApplicationController
  include CurrentCart
  before_action :set_cart, only: [:new, :create]
  before_action :set_order, only: [:show, :edit, :update, :destroy]

  def new
    if current_user.cart.line_items.empty?
        redirect_to root_path, notice: "Your cart is empty"
            return
        end
        @order = Order.new
    end

  def create
    @order = Order.new(order_params)
    @order.add_line_items_from_cart(@cart)

    respond_to do |format|
      if @order.save
        current_user.cart.destroy
        session[:cart_id] = nil

        format.html { redirect_to root_path, notice:
              'Thank you for your order.'}
        format.json { render action: 'show', status: :created,
              location: @order}
        else
          format.html {render action: 'new'}
          format.json {render json: @order.errors,
                status: :unprocessable_entity}
      end
    end
  end
  private
  def order_params
    params.require(:order).permit(:name, :address, :email, :pay_type)
    end
end

我的订单部分用于用户何时可以下订单

<%= form_for(@order) do |f|%>
<% if @order.errors.any?%>
  <div id="error_explanation">
    <h2> <%= pluralize(@order.errors.count, "error")%>
      prohibited this order from being saved:</h2>
      <ul>
        <% @order.errors.full_messages.each do |msg| %>
        <li><%= msg%></li>
        <%end%>
      </ul>
    </div>
    <%end%>

    <div class="field">
      <%= f.label :name %><br>
      <%= f.text_field :name, size: 40%>
    </div>
    <div class="field">
      <%= f.label :address %><br>
      <%= f.text_area :address, rows: 3, cols: 40%>
    </div>
    <div class="field">
      <%= f.label :email %><br>
      <%= f.email_field :email, size: 40%>
    </div>    </div>
    <div class="field">
      <%= f.label :pay_type %><br>
      <%= f.select :pay_type, Order::PAYMENT_TYPES,
                prompt: 'Select a payment method'%>
      </div>
      <div class="actions">
        <%= f.submit 'Place Order' %>
      </div>
      <%end%>

如果有人能向我解释为什么这不起作用，那将非常有帮助。

Answer 1

Theres an instance of current_user in a sessions helper thats included in the applications controller.

您的模型层中没有任何部分可用。您的模型无法访问控制器变量或助手。你不能在你的模型层中使用 current_user 除非你特别将它作为参数传递给你所在的任何方法。

Rails Order 的未定义局部变量或方法“current_user”

Rails undefined local variable or method `current_user' for Order

ruby-on-rails

undefined