ArthurZheng

<?xml version="1.0" encoding="UTF-8"?>

<AttributeResolver
    xmlns="urn:mace:shibboleth:2.0:resolver"
    xmlns:sec="urn:mace:shibboleth:2.0:security"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="urn:mace:shibboleth:2.0:resolver http://shibboleth.net/schema/idp/shibboleth-attribute-resolver.xsd
                        urn:mace:shibboleth:2.0:security http://shibboleth.net/schema/idp/shibboleth-security.xsd">

    <!-- ========================================== -->

ArthurZheng

{# style 1 - long form #}
{% if filepath == '/var/opt/tomcat_1' %}
  {% set tomcat_value = tomcat_1_value %}
{% else %}
  {% set tomcat_value = tomcat_2_value %}
{% endif %}

{# style 2 - short form #}
{% set tomcat_value = tomcat_1_value if (filepath == '/var/opt/tomcat_1') else tomcat_2_value %}

ArthurZheng

class Foo
  class << self
    def exec
      something
    rescue => ex
      ex.message
    end
    
    def something
      "something"

ArthurZheng

This script can help you find and remove unused AWS snapshots and volumes.

There is hardcoded list of regions that it searches, adjust the value to suit your needs.

Use snapshot.py snapshot-report to generate report.csv containing information about all snapshots.

snapshot.py snapshot-cleanup lets you interactively delete snapshot if it finds it is referencing unexisting resources.

./snapshots.py --help

ArthurZheng

ActiveRecord cheat sheet / EXAMPLES

INSTALL 
=======  
$ gem install activerecord
in GEMFILE: gem ‘activerecord’

REQUIRE 
=======  
require ‘active_record’

ArthurZheng

NOTE

You may not need local branches for all pull requests in a repo.

To fetch only the ref of a single pull request that you need, use this:

git fetch origin pull/7324/head:pr-7324
git checkout pr-7324
# ...

ArthurZheng

"""
Code adapted from and inspired by http://blog.ranman.org/cleaning-up-aws-with-boto3/.

"""
import os
import re
from datetime import datetime, timedelta
import boto3

ArthurZheng

#!/usr/bin/env python
##### USE ON YOUR OWN RISK - THIS IS GOING TO DEREGISTER AMI OLDER THAN 30 DAYS

import boto3
from dateutil.parser import parse
import datetime
age = 30
aws_profile_name = 'prod'
def days_old(date):
    get_date_obj = parse(date)

ArthurZheng

Using Rspec with Rails 4 patch method

In Rails 4 PATCH is the new HTTP methode for an update action. You can find the details here: http://weblog.rubyonrails.org/2012/2/25/edge-rails-patch-is-the-new-primary-http-method-for-updates/

Using PATCH in your specs

As you can imagine you need to use the PATCH method to test the update action in your controller. Because of how the users controller in this example works you need to specify the id and user. This particular spec tests whether the user gets redirected if it's not logged in.

(./spec/controllers/users_controller_spec.rb)

require 'spec_helper'

ArthurZheng

How to break long lines up in Ruby

This page lists the options for breaking single-line expressions into multiple lines in Ruby.

Developers and teams need to come to their own decisions about which guideline(s) they prefer (preferences below are just my personal choices and I encourage you to disregard them).

# With trailing parens
x = [1, 2, 3].join(
 '-'