allow donate from paypal

Gemfile.lock

@@ -1,6 +1,6 @@
 GIT
   remote: git@github.com:transist/payment.git
-  revision: 74903e087b80dd07f64dec85bea33c1fbe68f5a9
+  revision: 76a1a19b1077c77d64ec760fd2e3a844e4cf1a0b
   specs:
     payment (0.0.1)
       activemerchant

app/controllers/donates_controller.rb

@@ -1,12 +1,21 @@
 class DonatesController < ApplicationController
+  include Payment::PaypalHelper
+
   def index
-    @donate = Donate.new
+    @alipay_donate = Donate.new(:currency => 'rmb')
+    @paypal_donate = Donate.new(:currency => 'usd')
   end
 
   def create
     @donate = Donate.new(params[:donate])
     if @donate.valid?
       @donate.number = Guid.new.to_s.gsub('-', '')
+      if @donate.currency == "usd"
+        #redirect_to_paypal_gateway(:item_name => "donatecn", :amount => @donate.amount)
+        options = {:item_name => "donatecn", :amount => @donate.amount}
+        redirect_to URI.encode("https://www.sandbox.paypal.com/cgi-bin/webscr?cmd=_ext-enter&redirect_cmd=_xclick&charset=utf-8&business=#{Payment::CONFIGS["paypal"]["email"]}&currenct_code=USD&item_name=#{options[:item_name]}&amount=#{options[:amount]}")
+        return
+      end
       render :confirm
     else
       render :index

app/models/donate.rb

@@ -3,7 +3,7 @@ class Donate
   include ActiveModel::Conversion
   extend ActiveModel::Naming
 
-  attr_accessor :amount, :number
+  attr_accessor :amount, :number, :currency
   validates_numericality_of :amount, :greater_than => 0
 
   def initialize(attributes = {})

app/views/donates/index.html.haml

@@ -1,11 +1,19 @@
 %h2 捐助
 
-- form_for @donate do |f|
-  = f.label :amount, '金额: '
+= form_for @alipay_donate do |f|
+  = f.hidden_field :currency
+  = f.label :amount, '支付宝 金额: '
   ¥
   = f.text_field :amount
   = f.submit '捐助'
 
+= form_for @paypal_donate do |f|
+  = f.hidden_field :currency
+  = f.label :amount, 'paypal amount: '
+  $
+  = f.text_field :amount
+  = f.submit 'donate'
+
 %h2 捐助记录
 %table.transactions
   %th 捐助人