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Using Git

Global Settings

Related Setup: https://gist.github.com/hofmannsven/6814278

Related Pro Tips: https://ochronus.com/git-tips-from-the-trenches/

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#!/usr/bin/env ruby
require "openssl"
require 'digest/sha2'
require 'base64'

# We use the AES 256 bit cipher-block chaining symetric encryption
alg = "AES-256-CBC"

# We want a 256 bit key symetric key based on some passphrase
digest = Digest::SHA256.new

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This guide assumes that you recently run brew upgrade postgresql and discovered to your dismay that you accidentally bumped from one major version to another: say 9.3.x to 9.4.x. Yes, that is a major version bump in PG land.

First let's check something.

brew info postgresql

The top of what gets printed as a result is the most important:

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# Video: http://rubyhoedown2008.confreaks.com/08-chris-wanstrath-keynote.html

Hi everyone, I'm Chris Wanstrath.

When Jeremy asked me to come talk, I said yes.  Hell yes.  Immediately.  But
then I took a few moments and thought, Wait, why?  Why me?  What am I supposed
to say that's interesting?  Something about Ruby, perhaps.  Maybe the
future of it.  The future of something, at least.  That sounds
keynote-y.

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###Quick links to get started:

http://nithinbekal.com/posts/rails-presenters/

http://eewang.github.io/blog/2013/09/26/presenting-the-rails-presenter-pattern/

Thoughts about Rails Presenters

This is a collection of links, examples and rants about Presenters/Decorators in Rails.

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Algorithms: Design and Analysis, Part 2

The course will have six weeks of lectures and assignments, followed by a final exam.

Week 1

I. TWO MOTIVATING APPLICATIONS

• Distributed shortest-path routing -- sending email messages

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GeoPlanet data with ancestor chain cache imported in 10 minutes

Yahoo! provides its GeoPlanet data as three separate TSV files, available for download here.

That's a database with some 17 million records:

• 5.7 million records: locations (aka places).
• 2.2 million records: alternative names for each place (aka aliases).
• 9.6 million records: matrix of neighbourhoods per place (aka adjacencies).

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Rails Rspec APIs Testing Notes

Folders Structure

  spec
  |--- apis #do not put into controllers folder. 
        |--- your_api_test_spec.rb  
  |--- controllers
  |--- models
  |--- factories
 |--- views

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belongs_to:

1. Assigning an object to a belongs_to association does not automatically save the object. It does not save the associated object either.

has_one:

1. When you assign an object to a has_one association, that object is automatically saved (in order to update its foreign key).
2. In addition, any object being replaced is also automatically saved, because its foreign key will change too
3. If either of these saves fails due to validation errors, then the assignment statement returns false and the assignment itself is cancelled.
4. If the parent object (the one declaring the has_one association) is unsaved (that is, new_record? returns true) then the child objects are not saved. They will automatically when the parent object is saved.

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DROP TABLE IF EXISTS survey_sessions;
-- Imagine a table with survey sessions
-- token: some id or token to access a survey
-- answers: a key value store for answers
CREATE TABLE survey_sessions (
  token text,
  answers hstore);

-- We need some data to play with
INSERT INTO survey_sessions (token, answers) VALUES ('9IaxxP', 'a=>1, b=>2');