小编Kar*_*tle的帖子

如果我有以下,

<% @feed.sort_by{|t| - t.created_at.to_i}.each do |feed| %> 

<% end %>

如何限制它只显示最近的10个结果

我有一个猜测表,每个猜测只是一个日期.我想知道如何将两个或更多日期变成平均值.

<div id="logic">
<% foo = Date.today %>
<% bar = Date.today + 10 %>
<%= (foo + bar) / 2 %>

像这样的东西,但显然Ruby不会让我分开这两个日期.

我试图获得以下XML输出

<?xml version="1.0" encoding="UTF-8"?>

<CreateHostedZoneRequest xmlns="https://route53.amazonaws.com/doc/2012-12-12/">
   <Name>DNS domain name</Name>
   <CallerReference>unique description</CallerReference>
   <HostedZoneConfig>
      <Comment>optional comment</Comment>
   </HostedZoneConfig>
</CreateHostedZoneRequest>

我有以下输出非常接近的XML,但我无法编码到CreateHostedZoneRequest

的xmlns ="https://route53.amazonaws.com/doc/2012-12-12/

package main

import "fmt"
import "encoding/xml"

type ZoneRequest struct {
  Name            string
  CallerReference string
  Comment         string `xml:"HostedZoneConfig>Comment"`
}

var zoneRequest = ZoneRequest{
  Name:            "DNS domain name",
  CallerReference: "unique description",
  Comment:         "optional comment",
}

func main() {
  tmp, _ := createHostedZoneXML(zoneRequest)
  fmt.Println(tmp)
}

func createHostedZoneXML(zoneRequest ZoneRequest) (response string, err error) {
  tmp := struct {
    ZoneRequest
    XMLName struct{} `xml:"CreateHostedZoneRequest"`
  }{ZoneRequest: zoneRequest}

  byteXML, …

我正在尝试通过串口发送一个整数到我的Ardunio.然后芯片将在LED上显示二进制数字.但是,我在尝试通过串行端口将数据作为一个字节发送时遇到了很多麻烦,只要我可以调试以下代码将其作为ASC char值发送.

谁能指出我正确的方向或发现错误？我真的很感激.我已经把头发拉了很长时间.

红宝石

require 'rubygems'  
require 'serialport' # use Kernel::require on windows, works better.  

#params for serial port  
port_str = "/dev/tty.usbserial-A700dZt3"  #may be different for you  
baud_rate = 9600  
data_bits = 8  
stop_bits = 1  
parity = SerialPort::NONE  

sp = SerialPort.new(port_str, baud_rate, data_bits, stop_bits, parity)  

i = 15

#just write forever  
while true do  
  sp.write(i.to_s(2))
  sleep 10
end

Arduino的

int ledPin = 10;
int ledPin1 = 11;
int ledPin2 = 12;
int ledPin3 = 13;

byte incomingByte;  // for …

我在一个子模块中工作,并且无法解开一个装满文件的文件夹

$ git status
# On branch master
# Changes not staged for commit:
#   (use "git add <file>..." to update what will be committed)
#   (use "git checkout -- <file>..." to discard changes in working directory)
#
    #   modified:   public/javascripts/app/fckeditor/editor/skins/office2003/fck_dialog.css
    #   modified:   public/javascripts/app/fckeditor/editor/skins/office2003/fck_editor.css
    #   modified:   public/javascripts/app/fckeditor/editor/skins/silver/fck_dialog.css
    #   modified:   public/javascripts/app/fckeditor/editor/skins/silver/fck_editor.css
    #   modified:   public/javascripts/app/fckeditor/fckconfig.js
    #   modified:   public/javascripts/app/fckeditor/fckeditor.js
    #   modified:   public/javascripts/app/fckeditor/fckpackager.xml

我打字

git reset --hard

返回

HEAD现在在b2c5a77什么都没有

但是当我打字的时候

git status

我再次受到长长的文件列表的欢迎.我试过了

git clean -f 

并删除整个子模块并从主服务器检出.我还试图删除子模块所属的整个项目,拉出然后启动并更新子模块但无济于事.

rm -rf project
git clone foo@bar.project.net:/home/rails/repo/gits/project.com
#Cloning …

我在Google Go lang中实施AWS Request Authentication

package main

import "fmt"
import "crypto/hmac"
import "crypto/sha256"
import "time"
import "encoding/base64"

func main() {
  AWSAccessKeyId := "MHAPUBLICKEY"
  AWSSecretKeyId := "MHAPRIVATEKEY"
  sha256         := sha256.New
  time           := time.Now().UTC().Format(time.ANSIC)
  hash           := hmac.New(sha256, []byte(AWSSecretKeyId))
  hash.Write([]byte(time))
  sha            := base64.URLEncoding.EncodeToString(hash.Sum(nil))

  fmt.Println("Date", time)
  fmt.Println("Content-Type","text/xml; charset=UTF-8")
  fmt.Println("AWS3-HTTPS AWSAccessKeyId=" + AWSAccessKeyId + ",Algorithm=HmacSHA256,Signature=" + sha)
}

我从亚马逊获得有效输出,但只有当'sha'哈希不包含任何_或 - 时

工作

'WFKzWNQlZEyTC9JFGFyqdf8AYj54aBj5btxPIaGTDbM ='

不工作HTTP/1.1 403 Forbidden SignatureDoesNotMatch

'H-FIs7of_CJ7LusAoQPzSWVt9hlXF_5gCQgedn_85lk ='

如何对AWS3-HTTPS标头进行编码,使其适用于任何一种情况？只是因为它是相关的,我目前正在复制并将输出粘贴到cURL中.我计划在Google Go中实现请求,并使其可靠地运行.

例如,如何从Savon请求中删除HTTP标头

client.request 'v5:ProcessShipments' do
  client.http.headers["SOAPAction"] = "example_post"
end

这会产生

DEBUG -- : SOAPAction: example_post

服务器会响应

Server did not recognize the value of HTTP Header SOAPAction: example_post.

但是,我不想要任何SOAPAction(s)

我试图清除变量并删除它.我搜索了一会儿,找不到任何东西,所以我希望以前没有问过.

提前致谢.

如果我不覆盖它,那么默认情况下Savon将使用client.request'v5:ProcessShipments',这也是不正确的.

我不明白为什么

(var ||= []) << 1

按预期工作但是

(var ||= true) = false

没有.

任何人都可以解释为什么它不起作用,这里发生了什么？

class Account < ActiveRecord::Base
  after_update :give_user_credit, :on => :update 

  def give_user_credit
    credit = User.current_user.credit + 3.8
    User.current_user.update_attribute(:credit, credit)
  end
end

当我使用它时服务器挂起,当我完全重新启动后回到应用程序时,我的信用额度为1000英镑.

这里发生了什么..

感谢:D