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dadadada2x：
user模型里加上 protected def email ...
流行的权限管理 gem devise的定制 -
Sev7en_jun：
shrekting 写道var pattern = /^(0| ...
强悍的ip格式 正则表达式验证 -
jiasanshou：
好文章！！！
RPM包rpmbuild SPEC文件深度说明 -
寻得乐中乐：
link_to其实就是个a标签，使用css控制，添加一个参数: ...
Rails在link_to中加参数 -
aiafei0001：
完全看不懂,不知所然.能表达清楚一点?
"$ is not defined" 的问题怎么办
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UPDATE: (05/03/2013)
当前使用：
#去掉所有的FactoryGirl.
find . -type f -name *_spec.rb -print | xargs sed -ie 's/FactoryGirl\.//g'
//Seems like Linux is being far too generous.
-i 's/^[[:space:]]\{11\}//g' <-- makes it look like
"s/^[[:space:]]\{11\}//g" is the extension given to & ...
shell script
- 博客分类：
- Linux
select r.name, count(p.id) from persons as p join rides as r on p.fav_ride_id = r.id group by r.id order by count(p.id) desc limit 2;
一整就用到
$PWD
$PATH
$HOME
The shell has variables to access arguments in the procedures, to define the environment and the like. Shell variables are:
$1 # arg ...
一个关于如何在指定文件大于1GB后，自动删除的问题。
批处理代码如下：
#!/bin/bash
# 当/var/log/syslog大于1GB时
# 自动将其备份，并清空
# 注意这里awk的使用
if ! [ -f /var/log/syslog ]
then
echo "file not exist!"
exit 1
fi
if [ `ls -l /var/log/syslog|awk '{print $5}'` -gt $((1024*1024)) ]
then
cat /var/log/syslog >> ~/l ...
查看一个进程占用了那个端口
- 博客分类：
- Linux
有时候需要在Linux下查看一个进程占用了那个端口，但是只知道进程大致的名称，比如要查看hadoop的namenode在哪个端口上运行，以便在eclipse中连接。
首先用ps命令查看进程的id：
$ ps -ef | grep Name
其中每一行（很长的时候会占用若干行）的第二个字段就是进程的id。
当然，对于在java虚拟机中运行的进程，比如hadoop的守护进程，可以直接用jsp命令查看：
$ jps | grep Name
或者已经知道进程的确切名称，可以用pidof查看：
$ pidof Name
查看到进程id之后，使用netstat命令查看其占用的端口：
...
当前ruby1.9.3 rails 3.2.8，流行的文件上传插件是paperclip和carrierwave
然而，简单的这是需要上传个文件的话，可以用更容易的办法
<%= form_tag({:action => :upload}, :multipart => true) do %>
<%= file_field_tag 'picture' %>
<% end %>
<%= form_for @person do |f| %>
<%= f.file_field :picture %>
< ...
def up
connection.execute(%q{
alter table contests
alter column prize type integer using cast(prize as integer),
alter column price set default 200
})
end
def up
case ActiveRecord::Base.connection
when ActiveRecord::ConnectionAdapters::PostgreSQLAd ...
# Create a structure with a name in Struct
Struct.new("Customer", :name, :address) #=> Struct::Customer
Struct::Customer.new("Dave", "123 Main") #=> #<struct Struct::Customer name="Dave", address="123 Main">
# Create a structur ...
class A
class << self
def class_name
to_s
end
end
end
A.define_singleton_method(:who_am_i) do
"I am: #{class_name}"
end
A.who_am_i # ==> "I am: A"
guy = "Bob"
guy.define_singleton_method(:hello) { "#{self}: Hello there! ...
ActiveRecord::Base.connection.execute("TRUNCATE TABLE #{table_name}")
class Person < ActiveRecord::Base
has_one :address, :as => :addressable
end
class Company < ActiveRecord::Base
has_one :address, :as => :addressable
end
class Address < ActiveRecord::Base
belongs_to :addressable, :polymorphic => true
end
Address 有adressable_id addr ...
http://stackoverflow.com/questions/457927/git-workflow-and-rebase-vs-merge-questions
引用
git fetch用来将自己本地的repo 更新到最新的。
但是fetch后，并不会显示到本地。 有两种办法， rebase 和 merge.
if you want masterA => masterB => masterC => yourworkhere => (masterD and E merged) => HEAD then use merge
if you want m ...
External PostgreSQL connections
1. To be able to reach the server remotely you have to add the following line into the file: /var/lib/pgsql/data/postgresql.conf:
listen_addresses = '*'
2. PostgreSQL, by default, refuses all connections it receives from any remote address. You have to relax these ru ...
Rails 3 Installation
sudo gem install rails
postgres as db installation<>br/
$ sudo apt-get install postgresql
Rails 3 App with postgres as database
$ rails new pg -d postgres
bundle installation
It will install dependency gems & postgres adapter for db connection
bundle install
Here ...
require 'active_support/core_ext'
YAML.parse("key: value").transform.to_xml
错误提示：
引用
I, [2012-09-04T08:52:02.594025 #3839] INFO -- : listening on addr=0.0.0.0:3000 fd=5
I, [2012-09-04T08:52:02.594204 #3839] INFO -- : worker=0 spawning...
I, [2012-09-04T08:52:02.594679 #3839] INFO -- : master process ready
I, [2012-09-04T08:52:02.595505 #3841] INFO -- : worker=0 spawned ...