[英]Incrementing repeated items in cart rails 4
當我將商品添加到購物車時遇到問題,如果商品已存在,則不會更新它,而是創建一個重復的商品。 我知道我需要通過驗證來檢查 order_item 是否存在,但我不太確定如何或在何處執行此操作。
class ApplicationController < ActionController::Base
# Prevent CSRF attacks by raising an exception.
# For APIs, you may want to use :null_session instead.
protect_from_forgery with: :exception
helper_method :current_order
helper_method :current_buylist_order
def current_order
if !session[:order_id].nil?
Order.find(session[:order_id])
else
Order.new
end
end
end
class OrderItemsController < ApplicationController
def create
@order = current_order
@order_item = @order.order_items.new(order_item_params)
@order.save
session[:order_id] = @order.id
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, :card_id)
end
end
class CartsController < ApplicationController
def show
@order_items = current_order.order_items
end
end
class Order < ActiveRecord::Base
belongs_to :order_status
has_many :order_items
before_create :set_order_status
before_save :update_subtotal
def subtotal
order_items.collect { |oi| oi.valid? ? (oi.quantity * oi.unit_price) : 0 }.sum
end
private
def set_order_status
self.order_status_id = 1
end
def update_subtotal
self[:subtotal] = subtotal
end
end
class OrderItem < ActiveRecord::Base
belongs_to :card
belongs_to :order
validates :quantity, presence: true, numericality: { only_integer: true, greater_than: 0 }
validate :card_present
validate :order_present
before_save :finalize
def unit_price
if persisted?
self[:unit_price]
else
card.price
end
end
def total_price
unit_price * quantity
end
private
def card_present
if card.nil?
errors.add(:card, "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
在OrderItemsController
,在create
和update
方法中,您使用的行@order_item = @order.order_items.new(order_item_params)
每次調用這些方法之一時都會初始化新項目。 您需要更改這些方法,因此它們僅在具有相同參數的項目不存在時才創建新項目。 看看first_or_initialize
或first_or_create
方法。 或者使用一個簡單的條件(例如,如果訂單中存在項目,則將數量增加一,否則創建新項目)
在您的 Order Items Controller 中,在 create 方法下,有一個代碼來檢查現有產品,如果您多次添加到購物車,則增加數量。 您也可以使用 jQuery 來禁用該按鈕。
在 order_items_controller 中的 create 方法下
@product_id = params['order_item']['product_id']
@order.order_items.each do |oi|
if oi.product_id.to_s == @product_id
updater(oi.id,params['order_item']['quantity']) and return
end
end
添加和數量更新的額外方法
def updater(id,quantity)
@order = current_order
@order_item = @order.order_items.find(id)
quantity = @order_item.quantity + quantity.to_i
@order_item.update(quantity:quantity)
@order_items = @order.order_items
end
對我有用的是:
def create
@order = current_order
if OrderItem.where("card_id = ? AND order_id = ?",
params[:order_item][:card_id], @order.id.to_s).empty?
@order_item = OrderItem.new(order_item_params)
@order_item.order = current_order
@order_item.save
else
@order_item = OrderItem.where("card_id = ? AND order_id = ?",
params[:order_item][:card_id], @order.id.to_s).first
quantity = @order_item.quantity += params[:order_item][:quantity].to_i
@order_item.update(quantity: quantity)
end
end
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