從購物車導軌應用程序中刪除項目？

Question

我正在建設E商店的鐵路。我正在嘗試從購物車中移除商品，但我不確定我會如何做到這一點。我不確定是否應該開始，因爲我是一個完全noob，並且一直在遵循一個教程，其中不包括如何添加刪除功能的項目。

這裏是GitHub庫github.com/DadiHall/brainstore

誰能告訴我這裏的鏈接？

我迄今是

的routes.rb

resource :cart, only: [:show] do 
    post "add", path: "add/:id", on: :member 
    delete "remove", path: "destroy/:id", on: :member 

    get :checkout 
    end 

在carts_controller.rb

class CartsController < ApplicationController 
    before_filter :initialize_cart 

    def add 
     @cart.add_item params[:id] 
     session["cart"] = @cart.serialize 
     product = Product.find params[:id] 
     redirect_to :back, notice: "Added #{product.name} to cart." 
    end 

    def show 

    end 

    def checkout 
     @order_form = OrderForm.new user: User.new 
     @client_token = Braintree::ClientToken.generate 
    end 

    #Delete 
    def destroy 
    redirect_to cart_path 
    end 


end  

的意見/車/ show.html.erb

<% @cart.items.each do |item| %> 

    <tr> 
    <td><%= item.quantity %></td> 
    <td><%= image_tag item.product.image.thumb %><%= link_to item.product.name, item.product %></td> 
    <td><%= item.total_price %></td> 
     <td><%= link_to 'Empty Cart', cart_path(@cart), method: :delete, confirm: 'are you sure?' %> 
</td> 
    </tr> 
<% end %> 

cart.rb model

class Cart 
    attr_reader :items 

    def self.build_from_hash hash 
     items = if hash ["cart"] then 
      hash["cart"] ["items"].map do |item_data| 
     CartItem.new item_data["product_id"], item_data["quantity"] 
     end 

    else 
     [] 
    end 

     new items 
    end 


    def initialize items = [] 
    @items = items 
    end 

    def add_item product_id 
    item = @items.find { |item| item.product_id == product_id } 
    if item 
     item.increment 
    else 
     @items << CartItem.new(product_id) 
    end 
    end 

    def empty? 
    @items.empty? 
    end 

    def count 
    @items.length 
    end 

    def serialize 
    items = @items.map do |item| 
     { 
      "product_id" => item.product_id, 
      "quantity" => item.quantity 
     } 
    end 

    { 

      "items" => items 
    } 


    end 

    def total_price 
    @items.inject(0) { |sum, item| sum + item.total_price } 
    end 




end 

cart_item.rb模型

class CartItem 
attr_reader :product_id, :quantity 

    def initialize product_id, quantity = 1 
    @product_id = product_id 
    @quantity = quantity 
    end 

    def increment 
    @quantity = @quantity + 1 
    end 

    def product 
    Product.find product_id 
    end 

    def total_price 
    product.price * quantity 
    end 


end 

Answer 1

在你摧毀路徑還沒有被破壞的對象但是你的車控制器。

，所以你必須做的事情有

的routes.rb

delete 'remove', path: 'destroy/:id' 

carts_controller.rb

def remove 
    cart = session['cart'] 
    item = cart['items'].find { |item| item['product_id'] == params[:id] } 
    if item 
    cart['items'].delete item 
    end 
    redirect_to cart_path 
end 

的意見/車/ show.html.erb

<td><%= link_to 'remove', remove_cart_path(item.product_id), method: :delete %></td>