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我想從另一個開發人員調試Rails應用程序。請記住，我對Ruby和Rails都沒有經驗。目標是允許用戶在進入PayPal付款頁面時使用信用卡付款而無需進行註冊。Ruby on Rails Paypal REST API來賓結帳
在模型/購物-card.rb實際的代碼是：
include PayPal::SDK::REST
class ShoppingCart
def initialize(session)
@session = session
@session["delivery"] ||= "shipping"
@session[:coupon] ||= {"token" => nil, "discount" => nil}
@session[:shopping_cart] ||= []
end
def delivery=(v)
@session["delivery"] = v
end
def delivery
@session["delivery"]
end
def should_add_shipping_costs?
@session["delivery"] == "shipping"
end
def cart
@session[:shopping_cart]
end
def discount
val = @session["coupon"]["discount"]
if val.nil?
nil
else
val.to_f
end
end
def token
@session["coupon"]["token"]
end
def coupon=(c)
@session["coupon"]["token"] = c.try("token")
@session["coupon"]["discount"] = c.try("discount")
end
def subtotal_discount
subtotal.to_f/100 * discount.to_f
end
def subtotal_after_discount
[(subtotal.to_f - subtotal_discount), 0].max
end
def subtotal_after_discount_with_vat
subtotal_after_discount + subtotal_after_discount/100 * 21
end
def add(product, quantity)
quantity = quantity.to_i
index = cart.find_index do |item|
item["id"] == product.id
end
# Not in chart
if index.nil?
item = product.to_cart
item[:quantity] = quantity
cart << item
else
item = cart[index]
item["quantity"] = item["quantity"].to_i + quantity
end
end
def remove(id)
cart.delete_if do |item|
item["id"].to_s == id.to_s
end
end
def clear
cart.clear
end
def each(&block)
cart.each(&block)
end
def each_with_index(&block)
cart.each_with_index(&block)
end
def empty?
cart.empty?
end
def to_paypal
f = cart.map do |item|
{
name: item["name"],
price: "%.2f" % item["price_or_promo"],
quantity: item["quantity"],
currency: "EUR",
}
end
f
end
def subtotal
amount = 0
each do |item|
amount += item["price_or_promo"].to_f * item["quantity"].to_i
end
"%.2f" % amount
end
def total_iva
subtotal.to_f * 0.21
end
def total_for(user)
t = subtotal_after_discount.to_f + total_iva + surcharge_for(user)
if self.should_add_shipping_costs?
t + shipping_cost
else
t
end
end
def surcharge_for(user)
user.surcharge ? subtotal.to_f * 0.052 : 0
end
def shipping_cost
total = 0
each do |item|
total += (item['shipping'].to_f * item['quantity'].to_i)
end
total
end
def create_payment(description, user)
payment = Payment.new({
:intent => :sale,
:payer => {
:payment_method => :paypal
},
:redirect_urls => {
:return_url => ENV['PAYPAL_RETURN_URL'],
:cancel_url => ENV['PAYPAL_CANCEL_URL']
},
:transactions => [{
:item_list => {
:items => {
:name => description,
:price => "%.2f" % total_for(user),
:quantity => 1,
:currency => "EUR"
}
},
:amount => {
:total => "%.2f" % total_for(user),
:currency => "EUR"
},
:description => description
}],
})
if payment.create
@session[:payment_id] = payment.id
end
payment
end
def build_order
order = Order.new(user_id: @session[:user_id])
each do |item|
order.operations << Operation.new(
product_id: item["id"],
quantity: item["quantity"].to_i
)
end
order
end
def complete_payment(params)
payment = Payment.find(@session[:payment_id])
if payment.execute(payer_id: params[:PayerID])
build_order.save!
@session[:payment] = nil
@session[:coupon] = nil
clear
end
if(coupon = Coupon.find_by(token: token))
coupon.used = true
coupon.save!
end
payment
end
end
和控制器/付款controller.rb
include PayPal::SDK::REST
class PaymentsController < ApplicationController
def checkout
@payment = shopping_cart.create_payment("Cultius Purchase", current_user)
if @payment.success?
redirect_to @payment.links.find{|v| v.method == "REDIRECT" }.href
else
logger.error "Error while creating payment:"
logger.error @payment.error.inspect
end
end
def success
shopping_cart.complete_payment(params)
end
end