Roberto Ruiz artificemm

Semantic Commit Messages

See how a minor change to your commit message style can make you a better programmer.

Format: <type>(<scope>): <subject>

<scope> is optional

Example

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

#SOLID Principles with ruby examples

##SRP - Single responsibility principle A class should have only a single responsibility.

Every class should have a single responsibility, and that responsibility should be entirely encapsulated. All its services should be narrowly aligned with that responsibility, this embrace the high cohesion.

##OCP - Open/closed principle Software entities should be open for extension, but closed for modification.

	http://stackoverflow.com/questions/22667401/postgres-json-data-type-rails-query
	http://stackoverflow.com/questions/40702813/query-on-postgres-json-array-field-in-rails

	#payload: [{"kind"=>"person"}]
	Segment.where("payload @> ?", [{kind: "person"}].to_json)

	#data: {"interest"=>["music", "movies", "programming"]}
	Segment.where("data @> ?", {"interest": ["music", "movies", "programming"]}.to_json)
	Segment.where("data #>> '{interest, 1}' = 'movies' ")
	Segment.where("jsonb_array_length(data->'interest') > 1")

	# from_cte_sql = ::Namespace::From.where_clause
	# ..


	from_table = Arel::Table.new(:from_lane)
	to_table = Arel::Table.new(:to_lane)
	rates_table = Arel::Table.new(:rates)

	rates_table
	.join(from_table).on(rates_table[:from_id].eq(from_table[:id]))

	function calculateDistance(rssi) {

	var txPower = -59 //hard coded power value. Usually ranges between -59 to -65

	if (rssi == 0) {
	return -1.0;
	}

	var ratio = rssi*1.0/txPower;
	if (ratio < 1.0) {

	function loadJson(callback) {
	var XmlHttpRequest = new XMLHttpRequest();
	XmlHttpRequest.overrideMimeType("application/json");
	XmlHttpRequest.open('GET', 'file.json', true);
	XmlHttpRequest.onreadystatechange = function () {
	if (XmlHttpRequest.readyState == 4 && XmlHttpRequest.status == "200") {
	// .open will NOT return a value
	// but simply returns undefined in async mode so use a callback
	callback(XmlHttpRequest.responseText);
	}

	CREATE TEXT SEARCH CONFIGURATION fr ( COPY = french );
	ALTER TEXT SEARCH CONFIGURATION fr ALTER MAPPING
	FOR hword, hword_part, word WITH unaccent, french_stem;

	CREATE TEXT SEARCH CONFIGURATION en ( COPY = english );
	ALTER TEXT SEARCH CONFIGURATION en ALTER MAPPING
	FOR hword, hword_part, word WITH unaccent, english_stem;

	CREATE TEXT SEARCH CONFIGURATION de ( COPY = german );
	ALTER TEXT SEARCH CONFIGURATION de ALTER MAPPING