Andrei Andreev andreimoment

Setting Up Clojure on OS X

I spent a lot of time trying to find a pretty optimal (for me) setup for Clojure… at the same time I was trying to dive in and learn it. This is never optimal; you shouldn't be fighting the environment while trying to learn something.

I feel like I went through a lot of pain searching Google, StackOverflow, blogs, and other sites for random tidbits of information and instructions.

This is a comprehensive "what I learned and what I ended up doing" that will hopefully be of use to others and act as a journal for myself if I ever have to do it again. I want to be very step-by-step and explain what's happening (and why) at each step.

I appreciate the effort you've put into documenting this, but there are a number of inaccuracies here that need to be addressed. We get

PSQL

Magic words:

psql -U postgres

Some interesting flags (to see all, use -h or --help depending on your psql version):

-E: will describe the underlaying queries of the \ commands (cool for learning!)
-l: psql will list all databases and then exit (useful if the user you connect with doesn't has a default database, like at AWS RDS)

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

Rules for good testing

Look at the following image...

...it shows an object being tested.

You can't see inside the object. All you can do is send it messages. This is an important point to make because we should be "testing the interface, and NOT the implementation" - doing so will allow us to change the implementation without causing our tests to break.

Deploy your own PaaS!

Setting up Dokku with DigitalOcean and Namecheap

..or how I made my own heroku in a few hours for $3.98.

This write-up is several years out of date! You probably shouldn't use it.

	/**
	* VH and VW units can cause issues on iOS devices: http://caniuse.com/#feat=viewport-units
	*
	* To overcome this, create media queries that target the width, height, and orientation of iOS devices.
	* It isn't optimal, but there is really no other way to solve the problem. In this example, I am fixing
	* the height of element `.foo` —which is a full width and height cover image.
	*
	* iOS Resolution Quick Reference: http://www.iosres.com/
	*/

	<!doctype html>
	<html>
	<head>
	<script src="//ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
	<script type="text/javascript">
	var spData = null;
	function doData(json) {
	spData = json.feed.entry;
	}

	class ApplicationController < ActionController::Base
	# ...

	concerning :Presenters do
	included do
	helper_method :present
	end

	def present(record_or_array, klass)
	if record_or_array.respond_to?(:map)

	# Get Sublime Text to use your rvm ruby without hardcoding a `$USER`.
	#
	# Include the configurations below the commend in the appropriate file listed below:
	#
	# - OS X ST2: ~/Library/Application Support/Sublime Text 2/Packages/Ruby/Ruby.sublime-build
	# - OS X ST3: ~/Library/Application Support/Sublime Text 3/Packages/User/Ruby.sublime-build
	# - Linux ST2: ~/.config/sublime-text-2/Packages/Ruby/Ruby.sublime-build
	# - Linux ST3: ~/.config/sublime-text-3/Packages/User/Ruby.sublime-build

	{