zhq_zhq (赵贺强)

将两个数组交叉合并分享

zhq_zhq — Thu, 21 May 2015 22:52:26 +0800

如何将两个数组交叉合并？如果是我的话，一般情况下，就会想到把一个数组中的元素迭代插入到另外一个数组，往往会忽略到数组扩容问题！造成性能上面的问题！另外一种方法：新建一个长度是两个数组之和的新数组，并按照余数把两个数组插入新创数组，恰恰正好解决了这个问题。

利用数组 insert 方法把一个数组中的元素迭代插入到另外一个数组方法一：

def test_one
    a = [1,3,5]
    b = [2,4,6]
    b.each_with_index do |i,index|
        a.insert(2*index+1,i)
    end
    a
end

新建一个长度是两个数组之和的新数组，并按照余数把两个数组插入新创数组方法二：

def test_two(c)
    a = [1,3,5]
    b = [2,4,6]
    c.each_with_index do |i,index|
        c[index] = index % 2 == 0 ? a[index/2] : b[index/2]
    end
end

测试两个方法的效率如下：测试方法一：

def test_time
    start = Time.now
    1000000.times {  test_one }
    Time.now - start
end

测试方法二：

def test_time
    start = Time.now
            c = Array.new(6)
    1000000.times {  test_two(c) }
    Time.now - start
end

具体耗时如何，请自己动手试试！

gem rest-client 插件遇到的问题，求解决思路

zhq_zhq — Sat, 06 Dec 2014 22:06:15 +0800

代码如下：

def test
    url ='http://list.tmall.com/search_product.htm?q=nike'
    results = RestClient::Resource.new(url,:verify_ssl=>false,
                                                        :timeout=>3600,
                                                        :headers =>{'host'=>'list.tmall.com', 'user-agent'=>'Mo'}).get
    results.force_encoding("gbk")
    page = Nokogiri::HTML.parse(results)
end

问题：为什么在本地调用该方法并没有问题，得到的也是我想要的结果，但是部署到服务器上面到的页面是错误的？

分析：该请求一定出现 302 重定向问题，或者 header 内设置的参数不全

尝试解决：利用 net/http 发送请求果然是 302 重定向问题，然后利用 location 获取到新的 URL 并设置 cookie 再次发送请求，但是得到的结果跟利用 rest-client 抓取获得到的页面一样，得到的并不是我想要的页面，请大妞支招？遇到类似问题该如何解决？@Rei

activerecord 用 find_by_sql 方法进行多表查询数据总是会出现一条 count 查询，如何去掉？(已解决)

zhq_zhq — Thu, 06 Nov 2014 19:48:08 +0800

表之间的关系如下图

Product.paginate_by_sql("SELECT distinct products.* FROM products left JOIN product_prices ON product_prices.product_id =products.id left JOIN taggings ON taggings.other_id = products.id AND taggings.t_type='product' left JOIN sub_taggings ON sub_taggings.other_id = products.id AND sub_taggings.t_type='product' left JOIN brand_products ON brand_products.product_id = products.id where #{conditions} order by #{order_info}",:per_page=>28, :page=>page||1)

下面是日志

19:39:10 DEBUG:   [1m[35mProduct Load (826.8ms)[0m  SELECT distinct products.* FROM products left JOIN product_prices ON product_prices.product_id = products.id left JOIN taggings ON taggings.other_id = products.id AND taggings.t_type='product' left JOIN sub_taggings ON sub_taggings.other_id = products.id AND sub_taggings.t_type='product' left JOIN brand_products ON brand_products.product_id = products.id where products.status=true order by products.is_top desc, products.is_recommend desc, products.rank desc, products.created_at desc LIMIT 28 OFFSET 0 
19:39:10 DEBUG:   [1m[36mEXPLAIN (15.6ms)[0m  [1mEXPLAIN SELECT distinct products.* FROM products left JOIN product_prices ON product_prices.product_id = products.id left JOIN taggings ON taggings.other_id = products.id AND taggings.t_type='product' left JOIN sub_taggings ON sub_taggings.other_id = products.id AND sub_taggings.t_type='product' left JOIN brand_products ON brand_products.product_id = products.id where products.status=true order by products.is_top desc, products.is_recommend desc, products.rank desc, products.created_at desc LIMIT 28 OFFSET 0[0m 
19:39:10 WARN: EXPLAIN for: SELECT distinct products.* FROM products left JOIN product_prices ON product_prices.product_id = products.id left JOIN taggings ON taggings.other_id = products.id AND taggings.t_type='product' left JOIN sub_taggings ON sub_taggings.other_id = products.id AND sub_taggings.t_type='product' left JOIN brand_products ON brand_products.product_id = products.id where products.status=true order by products.is_top desc, products.is_recommend desc, products.rank desc, products.created_at desc LIMIT 28 OFFSET 0
+----+-------------+----------------+------+-------------------------------------------------------------+------------------------------------+---------+-----------------+------+----------------------------------------------+
| id | select_type | table          | type | possible_keys                                               | key                                | key_len | ref             | rows | Extra                                        |
+----+-------------+----------------+------+-------------------------------------------------------------+------------------------------------+---------+-----------------+------+----------------------------------------------+
|  1 | SIMPLE      | products       | ref  | index_products_on_status                                    | index_products_on_status           | 2       | const           | 8627 | Using where; Using temporary; Using filesort |
|  1 | SIMPLE      | product_prices | ref  | index_product_prices_on_product_id                          | index_product_prices_on_product_id | 5       | qdd.products.id |    1 | Using index; Distinct                        |
|  1 | SIMPLE      | taggings       | ref  | index_taggings_on_t_type,index_taggings_on_other_id         | index_taggings_on_other_id         | 5       | qdd.products.id |    1 | Distinct                                     |
|  1 | SIMPLE      | sub_taggings   | ref  | index_sub_taggings_on_other_id,index_sub_taggings_on_t_type | index_sub_taggings_on_other_id     | 5       | qdd.products.id |    1 | Distinct                                     |
|  1 | SIMPLE      | brand_products | ref  | index_brand_products_on_product_id                          | index_brand_products_on_product_id | 5       | qdd.products.id |    1 | Using index; Distinct                        |
+----+-------------+----------------+------+-------------------------------------------------------------+------------------------------------+---------+-----------------+------+----------------------------------------------+
5 rows in set (0.03 sec)

19:39:12 DEBUG:   [1m[35mProduct Count (1497.6ms)[0m  SELECT COUNT(*) FROM (SELECT distinct products.* FROM products left JOIN product_prices ON product_prices.product_id = products.id left JOIN taggings ON taggings.other_id = products.id AND taggings.t_type='product' left JOIN sub_taggings ON sub_taggings.other_id = products.id AND sub_taggings.t_type='product' left JOIN brand_products ON brand_products.product_id = products.id where products.status=true ) AS count_table

will_paginate 插件支持对数组进行分页

def paginate(options = {})
    page     = options[:page] || 1
    per_page = options[:per_page] || WillPaginate.per_page
    total    = options[:total_entries] || self.length

    WillPaginate::Collection.create(page, per_page, total) do |pager|
      pager.replace self[pager.offset, pager.per_page].to_a
 end

如何获取第几个元素的属性（已解决）

zhq_zhq — Wed, 29 Oct 2014 21:11:39 +0800

$(function(){
   $('.main_test a').each(function(i){
        this.onclick=function(){
             alert(i+1);
             $(".main").each(function(){
                  $.ajax({
                          type: "get",
                          url: "/monitoring/orders/get_orders",
                          data: {
                                id: $(".main").find('.main_test a').eq(i).attr('href'),//如何获取到属性
                          },
                          success: function(data){

                             $('#dialog_content').html(data);
                          }
                      });
                      return false;
              });
             return false;
        };
   });
});

<div class="main">
     <div class="test"> 
        <a href="1234565">百度</a>
     </div>
     <div class="test"> 
        <a href="789">google</a>
     </div>
     <div class="test"> 
        <a href="http://www.111cn.net">msn</a>
     </div>
     <div class="test"> 
       <a href="7784">qq</a>
     </div>
</div>

nokogiri html 如何获取 input value 值 (已解决)

zhq_zhq — Tue, 16 Sep 2014 00:24:32 +0800

html 页面代码

<input id="featured_item_id" type="hidden" value="37545306978">

代码

def self.get_uri(product_id) 
    url = "http://zpzk100.com/details/#{product_id}"

    resp = RestClient.get("http://zpzk100.com/details/#{product_id}")
    html = Nokogiri::HTML(resp)
    href = html.css('.goto').attr('href').text
    uri = URI.parse(URI.encode(href.strip))
    resp = RestClient.get(uri)
    html = Nokogiri::HTML(resp)
    #获取input值
    html.at('input#featured_item_id').map{|node| node["value"]}
end

AngularJS + Rails3.2 生产环境 js 加载进去没效果

zhq_zhq — Thu, 31 Jul 2014 18:18:53 +0800

// //= require angular //= require angular-route //= require angular-touch //= require angular-animate //= require jquery.min //= require wx_swipe //= require app //= require angular-carousel

地址：www.zpzk100.com/wx/index

正则表达式匹配数字，字母，汉字，标点符号，特殊字符 @#￥&* 不包含的怎么写啊？？？

zhq_zhq — Tue, 22 Apr 2014 21:16:10 +0800

/^[a-zA-Z0-9\u4e00-\u9fa5-\u3000-\u301e\ufe10-\ufe19\ufe30-\ufe44\ufe50-\ufe6b\uff01-\uffee\,.;:"'!]+$/

我是这样写的，不知道哪里错了 . 和【】不能匹配求大神指导

已解决 ^[^!@#$%^&*=+]+$ 原来反过来写那么简单

多张表关联查询怎样提高查询速度

zhq_zhq — Fri, 11 Apr 2014 01:17:59 +0800

多表查询如何提高速度

Rails 应用性能优化如何做优化 rails3.2 ruby 1.9 求大妞指教

zhq_zhq — Thu, 10 Apr 2014 14:32:10 +0800

Rails 应用性能优化如何做优化 rails3.2 ruby 1.9 求大妞指教

ActiveRecord 内做了许多对 SQL 查询的方法和逻辑判断问题时一是 sql 查询的优化和代码重构这些层面导致整个项目运行过慢怎么解决

例如一些接口需要跟数据库打交道，但是有些代码你又不得不那样写的时候，你们怎么解决

求教大神数组内对象不重复 (已解决)

zhq_zhq — Fri, 04 Apr 2014 19:30:32 +0800

[#, #

如果我有 200 个商城，抓取过来的商品的 url 全部转换成手机版本的 url,且 url 几乎很少有规律，请问如果是你们怎么解决？我是一个个判断程序会很慢，求大神解决

zhq_zhq — Mon, 17 Mar 2014 20:42:42 +0800

如果我有 200 个商城，抓取过来的商品的 url 全部转换成手机版本的 url，且 url 几乎很少有规律，请问如果是你们怎么解决？我是一个个判断程序会很慢，求大神解决

check_box_tag 怎么修改后并没有更改数据库中的数据

zhq_zhq — Thu, 13 Mar 2014 15:29:46 +0800

rails api strip_tags and strip_links method 怎么不可以用求解释！！！

zhq_zhq — Mon, 10 Mar 2014 13:41:21 +0800

strip_tags("Strip these tags!")
出现如下错误

excel 取第几行第几列的值怎么取？？求指教

zhq_zhq — Sat, 22 Feb 2014 16:02:42 +0800

excel 取第几行第几列的值怎么取？？求指教

运行 rake assets:precompile 时总是出现编码问题，但是并没有写错啊

zhq_zhq — Wed, 12 Feb 2014 11:07:06 +0800

ActionView::Template::Error ("\xBE\xDC" on UTF-16LE (in F:/projects/zk/app/assets/javascripts/home.js)): 36: <%=render "layouts/footer"%> 37: 38: 39: <%= javascript_include_tag controller_name %> 40: 41:

rails 范围查找函数有吗 (已解决)

zhq_zhq — Tue, 21 Jan 2014 11:57:29 +0800

我有一张用户表和等级表，不建立关系用户表中有经验字段，等级表中也有相应的经验字段，我想通过用户表中的经验字段判断用户等级，除了用 if else if 等一个个比较经验所对应的等级表，还有其他的好方法吗

gem roo 插件使用问题报错

zhq_zhq — Mon, 06 Jan 2014 17:09:09 +0800

def self.import_xls(file) spreadsheet = open_spreadsheet(file) header = spreadsheet.row(18) (19..spreadsheet.last_row).each do |i| row = Hash[[header, spreadsheet.row(i)].transpose] order = find_by_id(row["id"]) || new order.attributes = row.to_hash.slice(*accessible_attributes) order.save! end end

def self.open_spreadsheet(file) case File.extname(file.original_filename) when ".csv" then Roo::CSV.new(file.path, file.original_filename) when ".xls" then Roo::Excel.new(file.path, nil) when ".xlsx" then Roo::Excelx.new(file.path, nil) else raise "未知类型：#{file.original_filename}" end end

上传的无论是.csv 还是.xls 都是报这个错误

测试时报 uninitialized constant OpenofficeExcel 和 uninitialized constant Excelx

TypeError in OrdersController#import_xls

C:/Users/LHP/AppData/Local/Temp/RackMultipart20140106-4700-sarris is not an Excel file

Rails.root: F:/projects/quality_discount Application Trace | Framework Trace | Full Trace

app/models/order.rb:256:in new' app/models/order.rb:256:inopen_spreadsheet' app/models/order.rb:243:in import_xls' app/controllers/orders_controller.rb:55:inimport_xls'

Request

Parameters:

{"utf8"=>"✓", "authenticity_token"=>"Io2Iq3bsBE4XNuTdcBXFwmD/8rWN32tJZ8OI/ZQNYk8=", "file"=>#>, "commit"=>"导入"}

Capistrano 部署问题 win7 中

zhq_zhq — Thu, 02 Jan 2014 11:32:16 +0800

Capistrano 文件配置完全正确，之前部署都没问题，但是今天部署出现 cap 及不是内部命令也不是外部命令问题，度娘寻了千百遍，环境变量也没错误就是不能部署了！并且还不能够重新来过，项目等着上线，急求大神，大妞们给予帮助。

不使用插件上传图片

zhq_zhq — Tue, 03 Dec 2013 02:33:23 +0800

class ApplicationController < ActionController::Base
  protect_from_forgery

  def uploadFile(file)
    require 'fileutils'
    file=params[:file]  
    if !file.original_filename.empty?  
      @filename=getFileName(file.original_filename)   
      File.open("#{File.expand_path(RAILS_ROOT)}/public/uploads/#{filename}", "wb") do |f|  
      f.write(file.read)  
    end  
      return @filename  
    end  
  end  

  def getFileName(filename)  
    if !filename.nil?  
      Time.now.strftime("%Y_%m_%d_%H_%M_%S") + '_' + filename  
    end  
  end  

  def save  
    unless request.get?  
      if filename=uploadFile(params[:file]['file'])  
        render :text=>filename  
      end  
    end  
  end   
end


  def create
    @photo = Photo.new(params[:photo])
    @photo.img_url=uploadFile(params[:img_url])
    @photo.save
    flash[:notice]="新建成功"
    redirect_to photos_url()
  end

报错 undefined method `original_filename' for nil:NilClass

发布文章的同时发表评论怎么写

zhq_zhq — Mon, 25 Nov 2013 18:02:47 +0800

发布文章的同时发表评论怎么写