Victor Salazar vhsalazar

Arel Cheatsheet on Steroids

A (more) complete cheatsheet for Arel, including NamedFunction functions, raw SQL and window functions.

posts = Arel::Table.new(:posts)
posts = Post.arel_table # ActiveRecord

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

When you assign an object to a has_one association, that object is automatically saved (in order to update its foreign key).
In addition, any object being replaced is also automatically saved, because its foreign key will change too
If either of these saves fails due to validation errors, then the assignment statement returns false and the assignment itself is cancelled.
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.

	if (!Array.prototype.indexOf) {
	Array.prototype.indexOf = function (needle) {
	for (var i = 0; i < this.length; i++) {
	if (this[i] === needle) {
	return i;
	}
	}
	return -1;
	};
	}

	#
	# Google I/O 2014 secret invite code finder
	#
	# Blake Caldwell, 2014
	#
	# Blog Post: http://blakecaldwell.net/blog/2014/4/23/solving-a-2014-google-io-secret-invite-puzzle.html
	#
	# Repeatedly hit https://developers.google.com looking two-colored "I/O" on the page,
	# with a secret code in comments below it. Using the color codes of the "I" and "O",
	# calculate the 6-character Google URL-shortened link code, and print the code out.

	//before running make sure you setup a GOPATH env variable and ran: "go get code.google.com/p/go.net/html"

	//to run: go run ioCrawler.go -url="http://developers.google.com/"
	//also try http://developer.android.com/index.html
	//output goo.gl links to try and redeem will be sent to foundLinks.txt

	//by the way there's an artificial "rate limit" in func crawler, you can lower that or raise it as you wish
	//You can also comment out the onlyGoogleRegex code if you don't want to limit to google.com/youtube
	//if you're getting I/O timeout errors, then you might need to increase the timeouts on line 231

 describe vs. context in rspec
 http://lmws.net/describe-vs-context-in-rspec
 In Rspec world, you often see people using both “describe” blocks and “context” blocks together, like this
 describe "launch the rocket" do
   context "all ready" do
   end
   context "not ready" do

	/*
	A set of custom made large numbers for a 16x2 LCD using the
	LiquidCrystal librabry. Works with displays compatible with the
	Hitachi HD44780 driver.

	The Cuicuit:
	LCD RS pin to D12
	LCD Enable pin to D11
	LCD D4 pin to D5
	LCD D5 pin to D4

	// GeoChart from https://google-developers.appspot.com/chart/interactive/docs/gallery/geochart

	// Try out by pasting code into: https://code.google.com/apis/ajax/playground/?type=visualization#geo_chart

	function drawVisualization() {
	var data = google.visualization.arrayToDataTable([
	['State', 'Foo Factor'],
	['US-IL', 200],
	['US-IN', 300],
	['US-IA', 20],