jcasimir

Transactions

As your business logic gets complex you may need to implement transactions. The classic example is a bank funds transfer from account A to account B. If the withdrawal from account A fails then the deposit to account B should either never take place or be rolled back.

Basics

All the complexity is handled by ActiveRecord::Transactions. Any model class or instance has a method named .transaction. When called and passed a block, that block will be executed inside a database transaction. If there's an exception raised, the transaction will automatically be rolled back.

Example

dhh

Hi David,
I came across your profile online and wanted to reach out about Development
Opportunities here at Groupon. The company is growing, and we're always
looking for folks with solid skills that can make positive contribution to
our continued success. Any chance you'd be open to a quick conversation
about opportunities, or for any possible networking potential? If so, let me
know when you're free and we can set up a time to chat. Also, if you are
interested, it would be great if you could forward a current resume over
that I can take a look at. I look forward to hearing back from you! Please
let me know if you have any questions.

nickboyce

# courtesy of juliocapote (http://news.ycombinator.com/item?id=485423)
def generate_code(len = 5)
  (1..len).map { (("a".."z").to_a + ("A".."Z").to_a + (0..9).to_a)[rand(62)] }.join
end

mufid

Mufid's Private Bookmark

Tech Related

• http://news.ycombinator.com

Scalability

• (nanti)

mufid

#!/bin/bash

for i in {1..116}
do
  if=`printf %03d $i`
  echo "Now downloading surat $if"
  sleep 1
  curl -LO "http://download.quranicaudio.com/quran/mishaari_raashid_al_3afaasee/$if.mp3"
done

jakeonrails

data:text/html, <style type="text/css">#e{position:absolute;top:0;right:0;bottom:0;left:0;}</style><div id="e"></div><script src="http://d1n0x3qji82z53.cloudfront.net/src-min-noconflict/ace.js" type="text/javascript" charset="utf-8"></script><script>var e=ace.edit("e");e.setTheme("ace/theme/monokai");e.getSession().setMode("ace/mode/ruby");</script>

toddwschneider

# you can make a text file of request times (in ms, one number per line) and import it here, or you can use a probability distribution to simulate request times (see below where setting req_durations_in_ms)
# rq = read.table("~/Downloads/request_times.txt", header=FALSE)$V1

# argument notes:
# parallel_router_count is only relevant if router_mode is set to "intelligent"
# choice_of_two, power_of_two, and unicorn_workers_per_dyno are only relevant if router_mode is set to "naive"
# you can only select one of choice_of_two, power_of_two, and unicorn_workers_per_dyno

run_simulation = function(router_mode = "naive",
                          reqs_per_minute = 9000,

sjl

var empty_list = function(selector) {
    return selector(undefined, undefined, true);
};

var prepend = function(el, list) {
    return function(selector) {
        return selector(el, list, false);
    };
};
var head = function(list) {

willurd

Each of these commands will run an ad hoc http static server in your current (or specified) directory, available at http://localhost:8000. Use this power wisely.

Discussion on reddit.

Python 2.x

$ python -m SimpleHTTPServer 8000

dypsilon

Frontend Development

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