在我的Rails应用程序,我有这样的代码在我_navbar.html.erb
显示车项目,而不是在导航栏的Rails应用车总价数
<% if @cart.total_price > 0 %>
<%= link_to @cart do %>
<i class="fa fa-shopping-cart"> € </i>
<%= @cart.total_price %>
<% end %>
<% else %>
<a href="#" class="menu-cart"><i class="fa fa-shopping-cart"></i> € 0.00</a>
<% end %>
它显示@cart.total_price
,但我希望它显示在总项目改为购物车。
我不知道该怎么做
大部分代码是从Udemy的教程,但它变得有点得多我的经验,所以我觉得那种失去的试图修改此我的需要。
我一直在试图将@product_item
添加到上面的代码,但出来运气,任何人都可以看看这个,并指导我通过这个。
我在application_controller.rb
before_action :set_cart
def set_cart
@cart = Cart.find(session[:cart_id])
rescue ActiveRecord::RecordNotFound
@cart = Cart.create
session[:cart_id] = @cart.id
end
在carts_controller.rb
这个代码,我有这样的:
class CartsController < ApplicationController
before_action :set_cart, only: [:show, :destroy]
rescue_from ActiveRecord::RecordNotFound, with: :invalid_cart
def new
@cart = Cart.new
end
def show
@images = ["1.jpg", "2.jpg", "3.jpg", "4.jpg", "5.jpg"]
@random_no = rand(5)
@random_image = @images[@random_no]
end
def destroy
@cart.destroy if @cart.id == session[:cart_id]
session[:cart_id] = nil
redirect_to root_url, notice: 'Your Cart is Empty'
end
private
def set_cart
@cart = Cart.find(params[:id])
end
def cart_params
params[:cart]
end
def invalid_cart
logger_error = 'You are trying to access invalid cart'
redirect_to root_url, notice: 'Invalid Cart'
end
end
在controllers/concerns
我有这个文件current_cart.rb
module CurrentCart
private
def set_cart
@cart = Cart.find(session[:cart_id])
rescue ActiveRecord::RecordNotFound
@cart = Cart.create
session[:cart_id] = @cart.id
end
end
然后我有product_items_controller.rb
,有这样的代码:
class ProductItemsController < ApplicationController
include CurrentCart
before_action :set_cart, only: [:create]
before_action :set_product_item, only: [:show, :destroy]
def create
@product = Product.find(params[:product_id])
@product_item = @cart.add_product(@product.id)
if @product_item.save
redirect_to root_url, notice:'Product added to Cart'
else
render :new
end
end
private
def set_product_items
@product_item = ProductItem.find(params[:id])
end
def product_item_params
params.require(:product_item).permit(:product_id)
end
end
及相关模型cart.rb
和product_item.rb
cart.rb
我有这样的代码:
class Cart < ActiveRecord::Base
has_many :product_items, dependent: :destroy
def add_product(product_id)
current_item = product_items.find_by(product_id: product_id)
if current_item
current_item.quantity += 1
else
current_item = product_items.build(product_id: product_id)
end
current_item
end
def total_price
product_items.to_a.sum{|item| item.total_price}
end
end
而在product_item.rb
有这样的代码:
class ProductItem < ActiveRecord::Base
belongs_to :product
belongs_to :cart
belongs_to :order
def total_price
product.price * quantity
end
end
不应该只是被总结所有与'cart'关联的所有'product_items'的数量? – lusketeer
是的,但我不确定如何将其写入导航栏代码中......目前,由于缺乏红宝石体验,此操作很复杂 – Slowboy
'<%= @ cart.products.count%>' –