keating

  validate :start_date_validate

  def start_date_validate
    if start_date && end_date
      if start_date >= end_date
        errors.add("", I18n.t("education_information.start_end_not_validate"))
      end
    end
  end

keating

require "active_record"

ActiveRecord::Base.establish_connection(
    :adapter => "postgresql",
    :host => "localhost",
    :username => "map",
    :password => "map",
    :database => "lspf"
)

keating

  agent = Mechanize.new
  page = agent.get('http://....../login')
  form = page.forms[0]
  form["user_session[login]"] = "......"
  form["user_session[password]"] = "......"
  form.submit
  #puts page.uri
  page = agent.get('http://...../synchrons')
  #puts page.uri
  #puts page

keating

def fetch_gps
  $client ||= Savon.client("http://...ip.../GPSInfo/Service.asmx?WSDL")
  data_hash, data_qty = {}, 0

  @equipments.each do |equ_no|
    begin
      response = $client.request "getGPSInfoByID" do
        $client.http.headers["Content-Type"] = "text/xml; charset=utf-8"
        $client.http.headers["SOAPAction"] = "http://tempuri.org/getGPSInfoByID"
        soap.body = {:id => equ_no}

keating

# 返回城市距离
def dis e1, e2
  if (e1 == "A" and e2 == "E") || (e1 == "E" and e2 == "B") || (e1 == "B" and e2 == "F")
    return 5
  end
  10
end

@boxes = []

keating

<style type="text/css">
    td {
        border: 1px solid #ccc;
        height: 24px;
        padding: 2px;
        vertical-align: top;
    }

    .ie9-bug-tr td {
        height: 0px;

keating

pid = fork { `nohup ruby GpsReader.rb 1 &` }
# 这种写法能得到一个子进程的PID，但不是shell命令所运行进程的PID，若shell命令启动一个服务（一直运行），那么此子进程也不会死掉（与block是个while true,子进程便不会死掉一样）
pid = fork { exec "`nohup ruby GpsReader.rb 1 &`" }
# 这种写法能得到一个子进程的PID，同样不是shell命令进程的PID，子进程马上就结束了（ps S -C ruby或ps S -p your_PID），是exec方法在起作用(Replaces the current process by running the given external _command_)，所以，在ruby代码运行一个shell命令时，使用exec要比直接`少一个进程
Process.detach(pid)
puts pid

while true
  puts "i am father..."
  sleep 2

keating

# 给关联关系赋值，发生了什么？

@sme = Sme.find(params[:id])
@sme.sme_inspections = @sme.build_inspections params[:inspections]

# @sme.sme_inspections的class是个array，@sme.build_inspections params[:inspections] 只不过构造了一个sme_inspection的数组，并且数组中sme_inspection的sme_id为空

# 但接下来发生了这些

#SmeInspection Load (0.7ms)  SELECT "sme_inspections".* FROM "sme_inspections" WHERE "sme_inspections"."sme_id" = 29

keating

#encoding: utf-8
require "nokogiri"
require "open-uri"

domain = 'http://sample.com&page='

begin
  1.upto 1000 do |i|
    html = open(domain + i.to_s, :proxy => "http://127.0.0.1:8087", :read_timeout => 1).read
    html.force_encoding("gbk")

keating

#!/usr/bin/ruby
require 'rss'

p 'Downloading rss index'

rss_string = open('http://feeds.feedburner.com/railscasts').read
rss = RSS::Parser.parse(rss_string, false)
videos_urls = rss.items.map { |it| it.enclosure.url }.reverse

videos_filenames = videos_urls.map {|url| url.split('/').last }