Span Zhang（张友邦）的专栏 (分形艺术，摄影，软件开发，生活休闲)

Ruby矢量和矩阵数学库：NArray

张友邦 — Tue, 30 Jun 2009 18:59:00 +0800

很棒的东东，特别是你需要处理一些数学矩阵运算的时候。它可以允许你创建任何维数的矩阵，并且提供了必要的数学运算支持。有一些demo可以学习，不难掌握。

圣淘沙闲逛，傻照两张！

张友邦 — Sun, 28 Jun 2009 04:02:00 +0800

今天去City Hall附近的一家餐馆（Seoul Garden）吃自助烤肉，感觉还不错。那个服务员长得很像董洁，但还是看得出是东南亚的美女类型。当时很想问她能不能给她照张像，但又觉得大庭广众之下要是遭到拒绝实在不是很好。而且她正在上班，risk相当高，就打消了这个念头。

新加坡Ruby开发者6月聚会

张友邦 — Fri, 26 Jun 2009 18:21:00 +0800

这次聚会在昨天晚上7点开始，9点左右结束。我从NTU坐德士过去，路上遇到heavy traffic，足足花了将近一个小时才到达位于Suntec City的Yahoo办公室。no way to bypass!

主要发言的是Sau Sheong (Ruby and the Cloud)和Jason Ong (Kiosks with Rails) 。Sau说的是Heroku的相关内容，基本上我在之前都没有听说过。不过我觉得Heroku是个不错的idea，在云里面用ruby开发的想法我之前也有过，但因为这是在赚开发者的钱，所以没有付诸实际行动。另外一个议题是Jason的一个rails应用，很有意思的是，做的居然是一个商店pos系统。客户端用的是firefox，操作系统用的是ubuntu。主要介绍了一些关于硬件和配置方面的事情。大家都觉得这个东西挺特别，因为比较具体，讨论起来也很方便。整个聚会的氛围很棒，大家都挺随意的分享和沟通。不过因为我的相机坏了，所以没有拍一张照片回来：（

我从Yahoo的办公室出来的时候是9点20。因为是头一次在晚

got something to write

张友邦 — Mon, 22 Jun 2009 05:40:00 +0800

today's father's day. wish all fathers in this world be happy, including me.and today's sunday. i went to the singapore international water festival. on the way to this great festival, i helped a pretty woman taking her little baby downstairs. the baby carriage was really heavy. and when i was gonna take it downstairs, the young mother asked me if i'm really sure i can do it or not. i just told her don't worry, i did such stuff for so many times before.there were

Keep my blog updated

张友邦 — Fri, 05 Jun 2009 18:09:00 +0800

there's not so much stuff to say. just keep my blog updated.i went to boon lay to buy something yesterday night. and when i arrived there, it's nearly 7 pm. i planned to buy some books to read first. so i managed to get the bookstore for a quick browsing. ufortunately, i found nothing matches my requirements. so, i went out and headed for the FairPrice supermarket for a bottle of super glue. i need it to repair my shoes. and thanks god, i found it quickly. it cost me 2.79 S$.

dear diary - 25 may 2009

张友邦 — Mon, 25 May 2009 23:50:00 +0800

i woke up this morning at the new place i just rented. it's a common room with few furnitures. there's a single bed, a computer desk, a electric fan, two chairs and a wardrobe. really simple! next to my room, it's a carpark in layers. so, it's a little noisy. but that's not a big problem for me. i think i can stand for it, at least for the time being.this afternoon, i went to the finance office to visit Daphne Goh to collect my sallary cheque. she told me that my bank account numbe

It's been a long time ...

张友邦 — Thu, 21 May 2009 17:27:00 +0800

It's been a long time that I said nothing on my blog. Life is like a still pool to me. Everything's normal and there's no big ups and downs. I still find each day too short for all my thoughts I want to think, all the walks I want to take, all the books I want to read. As a matter of fact, I really want to say something, to my family, to my friends and to myself. But everything seems to be a bit pale and has no necessity to talk about when the word come to my throat...Well, to

清楚数据库中的全部数据并将ID归零

张友邦 — Sat, 04 Apr 2009 17:09:00 +0800

在开发阶段常常要做这样的事情，把数据库中的数据全部清除掉已重新填写正确的数据。

ActiveRecord::Base.connection.tables.each do |table|
ActiveRecord::Base.connection.execute("truncate table #{table}")
end

Ruby on Rails开发带二级域名业务的应用

张友邦 — Mon, 23 Feb 2009 19:55:00 +0800

现在使用二级域名的情况非常的普遍，正好我们公司就需要。以下是开发环境：

OS: Microsoft Windows [版本 5.2.3790]
Ruby: ruby 1.8.6 (2007-09-24 patchlevel 111) [i386-mswin32]
Rails: Rails 2.0.2

接下来是做域名映射，修改Windows的hosts文件，让目标域名解析到我们的开发机器上。打开c:\Windows\System32\DRIVERS\etc\hosts文件，增添如下内容：

127.0.0.1 yourdomain.com

然后就是解决session跨域的问题，打开development.rb（部署的时候是production.rb），增加：

ActionController::Base.session_options[:session_domain] = '.yourdomain.com'

Ruby on Rails自动事务过滤器及相应的错误处理

张友邦 — Tue, 10 Feb 2009 22:28:00 +0800

这是写在ApplicationController里的处理代码。其中的set_notice只是将flash[:notice]设置一下，以便在error_notice页面显示。