Question

我正在尝试使用基本购物车构建一个rails（带有设计宝石）电子商店应用程序。我在互联网上找到了一些处理购物车的教程，我已经按照它进行了操作代码与以下帖子非常相似：

Rails Shopping Cart - not adding to current order

但是，在尝试将产品添加到购物车时，订单部分存在问题。订单从未实例化（我假设），因此无法保存，产品也不会添加到购物车中我做了很多研究并尝试调试但是我被卡住了。

对于长篇文章感到抱歉，但我想尽可能准确，以便轻松回答。

你能帮忙找出我错在哪里吗？请提前获取答案。

控制器：

ORDER_ITEMS

class OrderItemsController < ApplicationController
  skip_before_action :authenticate_user!

  def create
    @order = current_order
    @item = @order.order_items.new(order_item_params)
    if @order.save
      session[:order_id] = @order.id
      flash[:notice] = "Product Successfully added to your cart"
      redirect_to produits_path
    else
      flash[:notice] = "Problem"
      redirect_to produits_path
    end
  end

  def update
    @order = current_order
    @order_item = @order.order_items.find(params[:id])
    @order_item.update_attributes(order_item_params)
    @order_items = @order.order_items
  end

  def destroy
    @order = current_order
    @order_item = @order.order_items.find(params[:id])
    @order_item.destroy
    @order_items = @order.order_items
  end

private

  def order_item_params
    params.require(:order_item).permit(:quantity, :produit_id)
  end

end

推车

class CartsController < ApplicationController
  skip_before_action :authenticate_user!

  def show
    @order_items = current_order.order_items
  end
end

产品

class ProduitsController < ApplicationController
  skip_before_action :authenticate_user!

  def index
    @produits = Produit.all
    @order_item = current_order.order_items.new
  end
end

应用

 class ApplicationController < ActionController::Base
  protect_from_forgery with: :exception
  helper_method :current_order

  before_action :authenticate_user!
  before_action :configure_permitted_parameters, if: :devise_controller?

  def current_order
    if !session[:order_id].nil?
      Order.find(session[:order_id])
    else
      Order.new
    end
  end

  def configure_permitted_parameters
    # For additional fields in app/views/devise/registrations/new.html.erb
    devise_parameter_sanitizer.permit(:sign_up, keys: [:prenom, :nom, :adresse, :telephone])
    devise_parameter_sanitizer.permit(:account_update, keys: [:prenom, :nom, :adresse, :telephone])
  end
end

模特：

OrderItem的

class OrderItem < ApplicationRecord
  belongs_to :order
  belongs_to :produit

  validates :quantity, presence: true, numericality: { only_integer: true, greater_than: 0 }
  validate :product_present
  validate :order_present

  before_save :finalize

  def unit_price
    if persisted?
      self[:unit_price]
    else
      produit.prix
    end
  end

  def total_price
    unit_price * quantity
  end

private

  def product_present
    if produit.nil?
      errors.add(:produit, "is not valid or is not active.")
    end
  end

  def order_present
    if order.nil?
      errors.add(:order, "is not a valid order.")
    end
  end

  def finalize
    self[:unit_price] = unit_price
    self[:total_price] = quantity * self[:unit_price]
  end
end

顺序

class Order < ApplicationRecord
  belongs_to :order_status
  belongs_to :user
  has_many :order_items
  before_create :set_order_status
  before_save :update_subtotal

  def subtotal
    order_items.collect { |oi| oi.valid? ? (oi.quantity * oi.prix) : 0 }.sum
  end


private
  def set_order_status
    self.order_status_id = 1
  end

  def update_subtotal
    self[:subtotal] = subtotal
  end
end

调试时我看到我的项目变量ok（产品ID和数量存在）但订单仍然是“nil”所以我输入代码的else部分。

     4: def create
     5:   binding.pry
     6:   @order = current_order
     7:   @item = @order.order_items.new(order_item_params)
 =>  8:   if @order.save
     9:     session[:order_id] = @order.id
    10:     flash[:notice] = "Product Successfully added to your cart"
    11:     redirect_to produits_path
    12:   else
    13:     flash[:notice] = "Problem"
    14:     redirect_to produits_path
    15:   end
    16: end

[4] pry(#<OrderItemsController>)> @order
=> #<Order:0x00007f8714ed1a50
 id: nil,
 status: nil,
 total_price: nil,
 created_at: nil,
 updated_at: nil,
 subtotal: nil,
 shipping: nil,
 user_id: nil>
[5] pry(#<OrderItemsController>)> @item
=> #<OrderItem:0x00007f8718e684e8 id: nil, produit_id: 47, order_id: nil, quantity: 1, created_at: nil, updated_at: nil>


     4: def create
     5:   binding.pry
     6:   @order = current_order
     7:   @item = @order.order_items.new(order_item_params)
     8:   if @order.save
     9:     session[:order_id] = @order.id
    10:     flash[:notice] = "Product Successfully added to your cart"
    11:     redirect_to produits_path
    12:   else
 => 13:     flash[:notice] = "Problem"
    14:     redirect_to produits_path
    15:   end
    16: end


pry(#<OrderItemsController>)> @order.save
   (0.3ms)  BEGIN
  ↳ (pry):7
   (0.3ms)  ROLLBACK
  ↳ (pry):7
=> false

Answer 1

在pry会话中尝试：

@order.errors

查看哪些验证失败，从而阻止@order被保存。

Rails购物车 - 在尝试将产品添加到购物车时未尝试实例化（零值）

1 个答案: