sitoto
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sitoto：
git revert 和reset的区别这里讲一下git re ...
git的revert和reset和 git push -
sitoto：
If x is your column or vector:s ...
string.strip--去除字符串空格 -
xueluowuhen_1：
正好用到了 谢谢！
ruby的数据类型转换-字符串转整型 -
ChuanSu：
jkjjlkjkljkljlkjlkj
关于建站 -
ChuanSu：
[/main void {zhedoushi shenm yi ...
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sqlite3-ruby gem can't find sqlite3.h on ubuntu
In my case I had to install libsqlite3-dev
sudo apt-get install libsqlite3-dev
NameError: uninitialized constant Net::SSH::KnownHosts::SUPPORTED_TYPE
===============
add in Gemfile
gem 'net-ssh', :git => 'git://github.com/nessche/net-ssh.git'
bundel exec deploy:setup
====
http://stackoverflow.com/questions/10741936/capistrano-nameerror-uninitialized-constant-netsshkno ...
I'm really new to refinery and fairly new to rails overall. I've
succesfully installed refinery and it's working great, except when I
want to add an image. I get the following error:
Dragonfly::ImageMagickUtils::ShellCommandFailed in Admin/
imagesController#create
I'm not sure what might be caus ...
ImageMagick in ubuntu
- 博客分类：
- ubuntu
ImageMagick is a powerful suite of tools in Ubuntu for scripting batch manipulations of images. Conversion between formats, resizing and hundreds of sophisticated filters can all be automated with only a few keystrokes. For that reason, it is popular with web developers, photographers and other users ...
I just made a breadcrumb for my site and put it in _content_page.html:
<% unless @page.home? %>
<ul id="breadcrumb">
<li><%= link_to "Home", root_url(:only_path => true) %> > </li>
<% [@page.anc ...
Rake
Rake lets you define a dependency tree of tasks to be executed
Rake tasks are loaded from the file Rakefile
Rails rake tasks are under railties/lib/tasks
Put your custom tasks under lib/tasks
Userful Rake Tasks
db:migrate
db:sessions:create
doc:app
doc:rails
log:clear
rails:freeze:gems
rails: ...
Constraint
- 博客分类：
- rails
get '/mobile' => 'posts#index' , :constraint => { :use_agent => /iPhone/}, :default => { :mobile => true }
rails2.* 里面的写法 named_scope
rails3.* 里面 去掉 named_ 就直接 scope
如：rails 2.
class Item
named_scope :red, :conditions => { :colour => 'red' }
named_scope :since, lambda {|time| {:conditions => ["created_at > ?", time] }}
end
rails 3.
class Item
scope :red, :conditions ...
Hash 和相等性
ActiveRecord 的 hash 值是根据主键的值计算出来的，这就意味着未保存对象的 hash 值是不可靠的。同样两个 model 对象的相等比较（即==操作符）也是基于主键的，所以两个 model 对象即使它们的其他属性不一样，仍有可能被当作相等。
查找
find_by_attribute 方法后面加个 ! 号，即使用 find_by_attribute!，就能在找不到对象的时候触发一个 RecordNotFound 异常，而不是返回 nil。
find_or_initialize_by 和 find_or_create_by 也是两个好用的方法，它们在找不到 ...
parameterize :替换掉特殊字符，让它看起来像个漂亮的url，主要是根据正则表达式 ，替换掉非字母、数字及下划线的字符。。中文也将被替换掉。。。。那就没的搞了。
中文的 url 还是要自己去定义了。
================
parameterize(string, sep = '-')
Replaces special characters in a string so that it may be used as part of a ‘pretty’ URL.
Examples
class Person
def to_param
"#{id}-# ...
怎么让Vim不自动生成这些备份文件呢？
1. 找到你的Vim安装目录，如果是在Windows下默认路径安装的，应该是在C:\Program Files\Vim\
2. 找到这个文件：vimrc_example.vim ，我的这个文件是在vim70文件夹下，具体还要看你安装的是什么版本的。
3. 找到后打开，找到这一句：if has("vms") 把这个判断里的if部分保留，else部分注释掉。（Vim的注释符是"）即修改后应该是这样的： if has("vms") set nobackup " do not keep a bac ...
Hi,
For some reason I cannot get WEBrick to boot anymore.
I installed and used Eclipse yesterday and all was working fine but
today I m getting this:
$ ruby script/server
=> Booting WEBrick...
=> Rails application started on http://127.0.0.1:3000
=> Ctrl-C to shutdown ...
启动redis时候提示：
ARE YOU SURE YOU WANT TO USE VM?
Redis Virtual Memory is going to be deprecated soon,
we think you should NOT use it, but use Redis only if
your data is suitable for an in-memory database.
If you *really* want VM add this in the config file:
really-use-vm yes
本机测试 ...
http://www.mongodb.org/downloads
From: http://blog.csdn.net/sheismylife/article/details/6737127
=================
获取最新版本
wget http://fastdl.mongodb.org/linux/mongodb-linux-x86_64-2.0.2.tgz
解压缩即可执行
tar zxvf mongodb-linux-x86_64-2.0.2.tgz
cd /usr/mongodb-linux-x86_64-2.0.2/bin
但是在运行 ...
From: http://junnan.org/blog/1454
安装说明:
本文是以root用户为例进行安装，如用普通用户，某些命令前需加sudo。
安装过程特别是用RubyGems和Git安装时，下载很慢，可以参考 《Ubuntu下使用proxychains为程序做全局代理
》来加快下载速度。
环境:
Ubuntu Server版本：11.10
Ruby版本：1.9.2
RubyGems版本: 1.8.11
Rails版本: 3.1.3
Node.js版本: 0.6.9
MongoDB版本：2.0.1
Redis版本：2.4.2
系统基本 ...