By default, Rails applications build URLs based on the primary key -- the id column from the database. Imagine we have a Person model and associated controller. We have a person record for Bob Martin that has id number 6. The URL for his show page would be:
/people/6
But, for aesthetic or SEO purposes, we want Bob's name in the URL. The last segment, the 6 here, is called the "slug". Let's look at a few ways to implement better slugs.
| #!/usr/bin/env ruby | |
| require 'spreadsheet' | |
| # Begin Test | |
| print "Spreadsheet Test\n" | |
| # Create the rows to be inserted | |
| row_1 = ['A1', 'B1'] | |
| row_2 = ['A2', 'B2'] |
| # # your config.ru | |
| # require 'unicorn_killer' | |
| # use UnicornKiller::MaxRequests, 1000 | |
| # use UnicornKiller::Oom, 400 * 1024 | |
| module UnicornKiller | |
| module Kill | |
| def quit | |
| sec = (Time.now - @process_start).to_i | |
| warn "#{self.class} send SIGQUIT (pid: #{Process.pid})\talive: #{sec} sec" |
| ## This gist is intended to provide a code example for the | |
| # 'Making Signed Requests' section of the 'Authentication Overview' document. | |
| # (http://developer.netflix.com/docs/Security). | |
| # | |
| # We are going to make a catalog request. The hardest part of | |
| # it is figuring out how to generate the oauth_signature. | |
| require 'cgi' | |
| require 'base64' | |
| require 'openssl' |
gcc -M hello.c 可以得到某文件依赖的头文件。
grep processor /proc/cpu_info 显示当前的CPU数目
sudo shutdown -r now 重启机器
sshfs yourname@host:/path/to/your/dir ~/local sshfs挂载到本地
sudo -u fleuria bash: 切换用户
| class Lisp | |
| def initialize | |
| @env = { | |
| :label => lambda { |(name,val), _| @env[name] = val }, | |
| :quote => lambda { |sexpr, _| sexpr[0] }, | |
| :car => lambda { |(list), _| list[0] }, | |
| :cdr => lambda { |(list), _| list.drop 1 }, | |
| :cons => lambda { |(e,cell), _| [e] + cell }, | |
| :eq => lambda { |(l,r), _| l == r }, | |
| :if => lambda { |(cond, thn, els), ctx| eval(cond, ctx) ? eval(thn, ctx) : eval(els, ctx) }, |
cribbed from http://pastebin.com/xgzeAmBn
Templates to remind you of the options and formatting for the different types of objects you might want to document using YARD.
I've been using this technique in most of my Ruby projects lately where Ruby versions are required:
.rbenv-version containing the target Ruby using a definition name defined in ruby-build (example below). These strings are a proper subset of RVM Ruby string names so far....rvmrc (with rvm --create --rvmrc "1.9.3@myapp") and edit the environment_id= line to fetch the Ruby version from .rbenv-version (example below).Today I learned about another Ruby manager, rbfu, where the author is using a similar technique with .rbfu-version.
| (defun port-available-p (port) | |
| (handler-case (let ((socket (usocket:socket-listen "127.0.0.1" port :reuse-address t))) | |
| (usocket:socket-close socket)) | |
| (usocket:address-in-use-error (e) (declare (ignore e)) nil))) | |
| ;; Find port number not in use from 50000 to 60000. | |
| (loop for port from (+ 50000 (random 1000)) upto 60000 | |
| if (port-available-p port) | |
| return port) |