MohamedAlaa

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

lfender6445

Pry Cheat Sheet

• Youtube Tutorial 2013

Command Line

• pry -r ./config/app_init_file.rb - load your app into a pry session (look at the file loaded by config.ru)
• pry -r ./config/environment.rb - load your rails into a pry session

Debugger

cdmwebs

Friendly URLs

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.

ernsheong

Access macOS localhost from IE or Edge within Parallels Desktop

This issue is so infuriating that I'm going to take some time to write about it.

1. MOST IMPORTANT. Your local development server must be bound to IP address 0.0.0.0. Some do this by default, but many don't. You need to make sure that you run your local server with correct IP bindings. You may need to provide additional flags to your serve commands e.g. polymer serve --hostname domain.local, hugo serve --bind 0.0.0.0. If you use a named domain like domain.local, it has to be defined in /etc/hosts and pointing at 0.0.0.0.

2. My Parallels setting is using Shared Network, nothing special there.

3. Open macOS Terminal and type ifconfig. Look for the value under vnic0 > inet. It is typically 10.211.55.2.

hgmnz

Types of index scans

Indexes

Sequential Scan:

• Read every row in the table
• No reading of index. Reading from indexes is also expensive.

mdesantis

# Schedule script for using Whenever toghether with rbenv
#
#   Whenever: https://github.com/javan/whenever
#   rbenv:    https://github.com/sstephenson/rbenv

set :env_path,    '"$HOME/.rbenv/shims":"$HOME/.rbenv/bin"'

# doesn't need modifications
# job_type :command, ":task :output"

ngocphamm

Backend Architectures

Twitter

ror, scala, jetty, erlang, thrift, mongrel, comet server, my-sql, memchached, varnish, kestrel(mq), starling, gizzard, cassandra, hadoop, vertica, munin, nagios, awstats

• Scaling Twitter: Making Twitter 10000 Percent Faster
• Scaling Twitter
• Blaine Cook on Scaling Twitter - YouTube

napcs

if has('win32') || has ('win64')
  let $VIMHOME = $HOME."/Dropbox/dotfiles/.vim"

  if !empty($CONEMUBUILD)
    set term=xterm
    set t_Co=256
    let &t_AB="\e[48;5;%dm"
    let &t_AF="\e[38;5;%dm"
  endif

com3345

'''
moving avg，就是一个stream输入，
给一个int getNow()API获取当前timestamp，
完成两个函数void record(int value)和double getAvg()，
有输入时会自动call record，然后call getAvg()时返回5分钟内的平均值。 
getMedium -> quick select
'''

from collections import deque

softwaredoug

What I did to get Python 3.4.2 on Ubuntu 14.04. The stock version of Python 3 on Ubuntu is 3.4.0. Which is missing some of the best parts! (asyncio, etc). Luckily I discovered pyenv which solved my problem.

Install pyenv

Pyenv (not to be confused with pyvenv) is the Python equivelant of rbenv. It lets you configure which Python environment/version is available per directory, user, or other session variables.

I followed the instructions here to install pyenv in my home directory. Verbatem, those instructions are:

sudo apt-get install git python-pip make build-essential libssl-dev zlib1g-dev libbz2-dev libreadline-dev libsqlite3-dev