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How to display unique records from a has_many through relationship?
... the best way to display unique records from a has_many, through relationship in Rails3.
4 Answers
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pdf2htmlEX实现pdf转html - 开源 & Github - 清泛网 - 专注C/C++及内核技术
...下面两张图片是html和pdf视图下的截图：
windows下载地址：pdf2htmlEX-v1.0-win32-static
本人开发的一个功能：文档在线阅读，要求能够支持移动终端浏览器在线阅读。考虑过将文档先转pdf，然后在将pdf转swf，利用flexpaper在前端浏...
一文讲透区块链技术原理 - 资讯 - 清泛网 - 专注C/C++及内核技术
...留存价值需要满足哪些附加条件。通常，发送价值到目标地址的脚本，要求价值的持有人提供以下两个条件，才能使用自己之前收到的价值：一个公钥，以及一个签名（证明价值的持有者拥有与上述公钥相对应的私钥）。脚本的...
Will HTML5 allow web apps to make peer-to-peer HTTP connections?
...formed answer:
HTML 5 plans to allow peer to peer connections from javascript, but these connections WILL NOT BE RAW TCP.
The complete spec can be found at http://dev.w3.org/html5/websockets/
jrh
EDIT: with specific reference to peer to peer connections, check out these links:
Regarding peer t...
【App Inventor 2 数据可视化】使用柱状图和饼图收集数据 - App应用开发 - ...
...thread-316532-1-1.html
文章aia源码如下：
[hide][/hide]
资源地址：https://drive.google.com/drive/f ... 0BGKOaa?usp=sharing（如打不开可以直接在附件中下载）
数据在行动1：使用柱状图和饼图收集数据跟踪我的情绪这个渐进式的指南告诉你...
Emulating a do-while loop in Bash
...is construct on the command line, I wouldn't do it as a one-liner (in a script, specifically) since the intent is unreadable.
– Paused until further notice.
Oct 19 '16 at 19:59
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I've found my software as cracked download on Internet, what to do?
...ng-and-entering and theft of property to illegal duplication/usage of your IP.
– Lèse majesté
Aug 24 '10 at 2:41
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在 App Inventor 2 中使用图像 · App Inventor 2 中文网
...= new QRCode("qrcode", { text: window.location.href + "?f=share", //URL地址 width: 150, height: 150, colorDark: '#000000', //二维码颜色 colorLight: "#ffffff" //背景颜色}); App Inventor 2 中文网 © 2023 - document.write(new Date().getFullYea...
Linux进程与线程总结 [推荐] - C/C++ - 清泛网 - 专注C/C++及内核技术
...联系更不能进行通信。一个完整的socket有网络协议、网络地址、网络端口三个属性，然后由操作系统为它分配一个本地唯一的socket号。就比如日常生活中的电话，双方必须都要拥有一台电话机而且号码必须唯一，建立通话时必须...
Why do people say that Ruby is slow? [closed]
...in, Nginx, SQLite, MySQL, PostgreSQL, many parsing libraries, RMagick, TCP/IP, etc are C programs used by Ruby. Ruby provides the glue and the business logic.
What are your options as a Ruby
programmer if you want to deal with
this "slowness"?
Switch to a faster language. But that carries...