• Rails.cache.store

1. 写入
Rails.cache.write('temp',Date.today,:expires_in => 60.seconds)
- 第一个参数key
- 第二个参数value
- 第三个参数有效期

2. 读取
Rails.cache.read('temp')   or Rails.cache.fetch('temp')


3. 删除
Rails.cache.delete('temp')

• Ruby的HTML/XML解析库 Nokogiri

require 'nokogiri 
str  = request.body.read #接收微信发过来的xml
doc  = Nokogiri::Slop(str) #解析xml
XML如下:

 <xml>
 <ToUserName><![CDATA[toUser]]></ToUserName>
 <FromUserName><![CDATA[fromUser]]></FromUserName> 
 <CreateTime>1348831860</CreateTime>
 <MsgType><![CDATA[text]]></MsgType>
 <Content><![CDATA[this is a test]]></Content>
 <MsgId>1234567890123456</MsgId>
 </xml>

type = doc.xml.MsgType.content #解析MsgType标签内的内容

微信开发Rails3.0参考

• Rails3.0 XML格式自带解析，可直接接收，4.0+已经去除，可以用gem包或者Nokogiri

微信开发Post/Get

def self.sent_to_wechat(url,body)
   uri = URI(url)
 Net::HTTP.start(uri.host, uri.port,:use_ssl => uri.scheme == 'https') do   |http|
   request= Net::HTTP::Post.new(uri,{'Content-Type'=>'application/json'})
   request.body=body
   puts request.body
   response=http.request request
   response.body
 end
end

#获取access_token
def get_access_token
      if Rails.cache.read("access_token").nil?
          uri = URI('https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=xxx&secret=xxx')
          res = Net::HTTP.get(uri)
          result = JSON.parse(res)#parse用于从一个字符串中解析出json对象
          access_token =  result['access_token']
          Rails.cache.write("access_token", access_token, expires_in: 5.minutes)
      else
        access_token = Rails.cache.read("access_token")
      end
 end

• 微信支付gem包

1.
gem 'wx_pay' #Gemfile
bundle 

2.config/initializers/wx_pay.rb
# required
WxPay.appid = 'YOUR_APPID' 
WxPay.key = 'YOUR_KEY'
WxPay.mch_id = 'YOUR_MCH_ID'
# optional - configurations for RestClient timeout,etc.
WxPay.extra_rest_client_options = {timeout: 2, open_timeout: 3}

3.创建pay方法
# required fields
params = { 
 body: '测试商品', 
 out_trade_no: 'test003', 
 total_fee: 1, 
 spbill_create_ip: request.remote_ip, #获取支付方IP
 notify_url: 'http://making.dev/notify', 
 trade_type: 'JSAPI', # could be "JSAPI", "NATIVE" or "APP",
 openid: 'OPENID' # required when trade_type is `JSAPI`
}
r = WxPay::Service.invoke_unifiedorder params

• WechatHelper

#向微信发送json数据
def send_json(url,body)
    uri = URI(url)
     Net::HTTP.start(uri.host, uri.port,:use_ssl => uri.scheme == 'https') do   |http|
      request= Net::HTTP::Post.new(uri,{'Content-Type'=>'application/json'})
      request.body=body
      puts request.body
      response=http.request request
      puts      response.body
    end
  end

#加密校验,确认来自微信服务器,返回echostr参数内容

def valid(token,nonce,stimestamp)
  if check_weixin_legality(token,nonce,stimestamp)
     return true
   else
     reutrn false
   end
end

#signature 校验
    #1.将token、timestamp、nonce三个参数进行字典序排序
    #2.将三个参数字符串拼接成一个字符串进行sha1加密
    #3.开发者获得加密后的字符串可与signature对比，标识该请求来源于微信
    def check_weixin_legality(t,n,s)
      timestamp = t
      nonce = n
      signature = s
      array = [@token,timestamp,nonce].sort
      if signature == Digest::SHA1.hexdigest(array.join)
        return true
      else
        return false
      end
    end


 #获取access_token
     def get_access_token(appid,secret)
        if Rails.cache.read("access_token").nil?
          uri = URI('https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=#{appid}&secret=#{}')
          res = Net::HTTP.get(uri)
          result = JSON.parse(res)
          Rails.cache.write("access_token",result['access_token'],expires_in: 2.hours)
        else
          Rails.cache.read("access_token")
        end
     end

#通过code换取网页授权access_token,网页授权access_token的同时，也获取到了openid
def code_access_token(appid,sercet,code)
        uri = URI("https://api.weixin.qq.com/sns/oauth2/access_token?appid=#{appid}&secret=#{sercet}&code=#{code}&grant_type=authorization_code")
        res = Net::HTTP.get(uri)
        result = JSON.parse(res)
 end

• send && eval(查询时，字段为变量时使用)

  region = Region.first
  key = "regions_NAME"
  region.send(key)  || eval('region.#{key}')

• 转时间戳

Time.now.to_datetime.strftime '%Q' #转时间戳
DateTime.strptime "1422258129106", '%Q' #时间戳转日期