ruby_metaprogramming

	# class.instance_methods(false)
	class Rubyist
	# the code in the following method definition is executed later,
	# when you eventually call the method
	def what_does_he_do
	@person = 'A Rubyist'
	'Ruby programming'
	end
	end
	an_object = Rubyist.new
	puts an_object.class # => Rubyist
	puts an_object.class.instance_methods(false) # => what_does_he_do
	an_object.what_does_he_do
	puts an_object.instance_variables # => @person
	#respond_to
	obj = Object.new
	if obj.respond_to?(:program)
	obj.program
	else
	puts "Sorry, the object doesn't understand the 'program' message."
	end
	#send
	class Rubyist
	def welcome(*args)
	"Welcome " + args.join(' ')
	end
	end
	obj = Rubyist.new
	puts(obj.send(:welcome, "famous", "Rubyists")) # => Welcome famous Rubyists
	#:method_missing
	class Rubyist
	def method_missing(m, *args, &block)
	str = "Called #{m} with #{args.inspect}"
	if block_given?
	puts str + " and also a block: #{block}"
	else
	puts str
	end
	end
	end
	# => Called anything with []
	Rubyist.new.anything
	# => Called anything with [3, 4] and also a block: #<Proc:0xa63878@tmp.rb:12>
	Rubyist.new.anything(3, 4) { something }
	#http://ruby-metaprogramming.rubylearning.com/html/ruby_metaprogramming_2.html

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ECMAScript 5: Tamper proofing objects

	var o = {
	foo: "bar"
	};
	// adding a new property normally:
	o.hey = "guys";
	// preventing further extensions:
	Object.preventExtensions(o);
	// silent error, or TypeError under strict mode:
	o.anotherProp = "This will fail!";
	// existing properties can still be changed:
	o.hey = "gals";
	var o = {
	foo: "bar"
	};
	// adding a new property normally:
	o.hey = "guys";
	// deleting a property normally:
	delete o.hey;
	// sealing the object:
	Object.seal(o);
	// silent failure, or TypeError under strict mode:
	o.anotherProp = "This will fail!";
	// existing properties can still be changed if they were writable:
	o.foo = "baz";
	// silent failure, or TypeError under strict mode:
	delete o.foo;
	//We can do everything Object.seal does, but also protect data properties
	//from being overwritten by using the Object.freeze method.
	var o = {
	foo: "bar"
	};
	// adding a new property normally:
	o.hey = "guys";
	// deleting a property normally:
	delete o.hey;
	// sealing the object:
	Object.freeze(o);
	// silent failures, or TypeErrors under strict mode:
	o.anotherProp = "This will fail!";
	o.foo = "baz";
	delete o.foo;
	var o = { foo: "bar" };
	Object.preventExtensions(o);
	Object.defineProperty(o, "foo", {
	writable: false,
	configurable: false
	});
	// Object.isFrozen(o) === true
	//http://www.jimmycuadra.com/posts/ecmascript-5-tamper-proofing-objects

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instance_values

	:instance_variables
	class Gift
	def initialize
	@name = "book"
	@price = 15.95
	end
	end
	gift = Gift.new
	hash = {}
	gift.instance_variables.each {|var| hash[var.to_s.delete("@")] = gift.instance_variable_get(var) }
	p hash # => {"name"=>"book", "price"=>15.95}
	:attributes.to_options
	App.first.attributes.to_options
	:instance_variable_get
	class Fred
	def initialize(p1, p2)
	@a, @b = p1, p2
	end
	end
	fred = Fred.new('cat', 99)
	fred.instance_variable_get(:@a) #=> "cat"
	fred.instance_variable_get("@b") #=> 99
	:instance_values
	Gift.new.instance_values # => {"name"=>"book", "price"=>15.95}
	:attributes
	App.first.attributes

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Active Record loves blocks

	#http://blog.plataformatec.com.br/page/3/
	#Active Record associations also love blocks
	#We talked about using blocks when building an Active Record object using new or create, but associations like belongs_to or #has_many also work with that, when calling build or create on them:
	class User < ActiveRecord::Base
	has_many :posts
	end
	class Post < ActiveRecord::Base
	belongs_to :user
	end
	# has_many
	user = User.first
	user.posts.build do |post|
	post.title = "Active Record <3 Blocks"
	post.body = "I can give tap a break! <3 <3 <3"
	end
	# belongs_to
	post = Post.first
	post.build_user do |user|
	user.name = "John Doe <3 blocks"
	user.username = "john.doe"
	user.password = "john123"
	end

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instance_eval && class_eval

	class Person
	end
	Person.class_eval do
	def say
	"malakias"
	end
	end
	me = Person.new
	me.say
	class Person
	end
	Person.instance_eval do
	def go_for_cofe?
	true
	end
	end
	Person.go_for_cofe?

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Keyboard Shortcuts for Bash

Ctrl + A	Go to the beginning of the line you are currently typing on
Ctrl + E	Go to the end of the line you are currently typing on
Ctrl + L	Clears the Screen, similar to the clear command
Ctrl + U	Clears the line before the cursor position. If you are at the end of the line, clears the entire line.
Ctrl + H	Same as backspace
Ctrl + R	Let’s you search through previously used commands
Ctrl + C	Kill whatever you are running
Ctrl + D	Exit the current shell
Ctrl + Z	Puts whatever you are running into a suspended background process. fg restores it.
Ctrl + W	Delete the word before the cursor
Ctrl + K	Clear the line after the cursor
Ctrl + T	Swap the last two characters before the cursor
Esc + T	Swap the last two words before the cursor
Alt + F	Move cursor forward one word on the current line
Alt + B	Move cursor backward one word on the current line
Tab	Auto-complete files and folder names

http://www.howtogeek.com/howto/ubuntu/keyboard-shortcuts-for-bash-command-shell-for-ubuntu-debian-suse-redhat-linux-etc/

wget links

	array=(
	"http://something.come/videos/somevideo.mp4"
	"http://something.come/videos/somevideo.mp4"
	"http://something.come/videos/somevideo.mp4"
	"http://something.come/videos/somevideo.mp4"
	"http://something.come/videos/somevideo.mp4"
	"http://something.come/videos/somevideo.mp4"
	"http://something.come/videos/somevideo.mp4"
	)
	for i in "${array[@]}"
	do
	wget $i
	done

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seed

	sed 's/FindThisWord/ReplaceWithThisWord/g' file.txt
	sed 's/Apple/MacLife/g' sample.txt
	#http://www.maclife.com/article/columns/terminal_101_find_and_replace_using_sed
	sed -n 's/Apple/MacLife/gpw output.txt' sample.txt

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via Instagram http://instagram.com/p/ca9hzKr5da/

jQuery clone one element

	<div id="contition_container">
	<div class="contition-group contition-group-style form-group">
	<select class="keys form-control" style="width: 30%; margin-right: 10px; float:left">
	<option value="">Keys</option>
	<% @category.app.data_to_json.map { |o| o.keys}.flatten.uniq.each do |k|%>
	<option value="<%= k %>"><%= k %></option>
	<% end %>
	</select>
	<select class="operators form-control" style="width: 10%; margin-right: 10px; float:left">
	<option value=">">Operators</option>
	<option value=">">></option>
	<option value=">">=></option>
	<option value=">"><</option>
	<option value=">"><=</option>
	<option value=">">==</option>
	<option value=">">!=</option>
	</select>
	<input type="text" class="form-control contitions" placeholder="value" style="float:left">
	<select class="logical form-control" style="width: 10%; margin-right: 10px; float:left">
	<option value=">">Logical</option>
	<option value=">">and</option>
	<option value=">">not</option>
	</select>
	<a class="clone btn btn-primary" style="float:left">more</a>
	</div> </div>
	<script type="text/javascript" charset="utf-8">
	$(".clone").click(function(){
	$(".contition-group").clone().prependTo("#contition_container")
	$(".contition-group").last().removeClass("contition-group")
	$(".clone").first().fadeOut("slow")
	});
	</script>

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Pry within rails4 console

	#config/application.rb
	module YourApp
	class Application < Rails::Application
	console do
	require "pry"
	config.console = Pry
	end
	end
	end
	#add to the gemfile
	group :development, :test do
	gem 'pry'
	end
	#rails console
	rails c
	cd YourModel
	#read more
	#https://github.com/pry/pry

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Upgrading to Bootstrap 3 RC1 with Rails 4.0.0.rc1

	#Add in application helper for bootstrap_flash
	module ApplicationHelper
	ALERT_TYPES = [:error, :info, :success, :warning]
	def bootstrap_flash
	flash_messages = []
	flash.each do |type, message|
	next if message.blank?
	type = :success if type == :notice
	type = :error if type == :alert
	next unless ALERT_TYPES.include?(type)
	Array(message).each do |msg|
	text = content_tag(:div,
	content_tag(:button, raw("×"), :class => "close", "data-dismiss" => "alert") +
	msg.html_safe, :class => "alert fade in alert-#{type}")
	flash_messages << text if msg
	end
	end
	flash_messages.join("\n").html_safe
	end
	end
	#Add to Gem file
	gem "sass-rails", "~> 4.0.0"
	gem 'anjlab-bootstrap-rails', :require => 'bootstrap-rails',
	:github => 'anjlab/bootstrap-rails',
	:branch => '3.0.0'
	rake assets:precompile

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javascript Module Pattern example

http://www.adequatelygood.com/JavaScript-Module-Pattern-In-Depth.html

	var MODULE = (function (my) {
	my.myMethod = function () {
	console.log("myMethod");
	};
	return my;
	}(MODULE || {}));

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Overwrite models attributes at Serializer with rails 4

	class AppSerializer < ActiveModel::Serializer
	attributes :hashid, :updated_at
	def updated_at
	object.updated_at.to_time.to_i
	end
	def attributes
	data = super
	data[:attribute] = edit_app_url(object)
	data
	end
	end

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rails generate uniqie hash

	class App < ActiveRecord::Base
	before_create :generate_hash_id
	private
	def generate_hash_id
	begin
	self.hash_id = SecureRandom.hex(30)
	end while self.class.exists?(hash_id: hash_id)
	end
	end

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Greeks.in the app that locates Greeks near you!

http://www.sbs.com.au/yourlanguage/greek/highlight/page/id/278502/t/Greeks.in-the-app-that-locates-Greeks-near-you/in/english

rails annotate gem

	#use annotate gem to annotate your models
	#add gem 'annotate' and annotate from app dir it will generate this in all models
	# == Schema Information
	#
	# Table name: users
	#
	# id :integer not null, primary key
	# uid :text
	# name :string(255)
	# link :string(255)
	# username :string(255)
	# hometown :string(255)
	# location :string(255)
	# quotes :text
	# gender :string(255)
	# created_at :datetime
	# updated_at :datetime
	# email :string(255) default(""), not null
	# encrypted_password :string(128) default(""), not null
	# reset_password_token :string(255)
	# reset_password_sent_at :datetime
	# remember_created_at :datetime
	# sign_in_count :integer default(0)
	# current_sign_in_at :datetime
	# last_sign_in_at :datetime
	# current_sign_in_ip :string(255)
	# last_sign_in_ip :string(255)
	# token :text
	# provider :string(255)
	# image :string(255)
	# latitude :float
	# longitude :float
	# token_local :text
	#

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newrelic_rpm with Rails 4 on heroku

There is a bug in newrelics config file

The solution:



1. in config/newrelic.yml

line 46  replace

app_name: <%= ENV["NEW_RELIC_APP_NAME"] %>

view is var in defined in heroku

blah:(master) ✗ heroku config
DATABASE_URL                 =>
HEROKU_POSTGRESQL_COBALT_URL =>
NEW_RELIC_LICENSE_KEY        =>
NEW_RELIC_LOG                =>
PAPERTRAIL_API_TOKEN         =>

set the var

heroku config:set NEW_RELIC_APP_NAME=new_app

also in ~/.profile

export NEW_RELIC_APP_NAME=my_app

Ιθάκη

	Σα βγεις στον πηγαιμό για την Ιθάκη,
	να εύχεσαι να’ναι μακρύς ο δρόμος,
	γεμάτος περιπέτειες, γεμάτος γνώσεις.
	Τους Λαιστρυγόνας και τους Κύκλωπας,
	τον θυμωμένο Ποσειδώνα μη φοβάσαι,
	τέτοια στον δρόμο σου ποτέ σου δεν θα βρεις,
	αν μέν' η σκέψις σου υψηλή, αν εκλεκτή
	συγκίνησις το πνεύμα και το σώμα σου αγγίζει.
	Τους Λαιστρυγόνας και τους Κύκλωπας,
	τον άγριο Ποσειδώνα δεν θα συναντήσεις,
	αν δεν τους κουβανείς μες στην ψυχή σου,
	αν η ψυχή σου δεν τους στήνει εμπρός σου.
	Να εύχεσαι να’ναι μακρύς ο δρόμος.
	Πολλά τα καλοκαιρινά πρωιά να είναι
	που με τι ευχαρίστηση, με τι χαρά
	θα μπαίνεις σε λιμένας πρωτοειδωμένους·
	να σταματήσεις σ' εμπορεία Φοινικικά,
	και τες καλές πραγμάτειες ν' αποκτήσεις,
	σεντέφια και κοράλλια, κεχριμπάρια κ' έβενους,
	και ηδονικά μυρωδικά κάθε λογής,
	όσο μπορείς πιο άφθονα ηδονικά μυρωδικά·
	σε πόλεις Aιγυπτιακές πολλές να πας,
	να μάθεις και να μάθεις απ' τους σπουδασμένους.
	Πάντα στον νου σου να’χεις την Ιθάκη.
	Το φθάσιμον εκεί είν ο προορισμός σου.
	Aλλά μη βιάζεις το ταξίδι διόλου.
	Καλλίτερα χρόνια πολλά να διαρκέσει·
	και γέρος πια ν' αράξεις στο νησί,
	πλούσιος με όσα κέρδισες στον δρόμο,
	μη προσδοκώντας πλούτη να σε δώσει η Ιθάκη.
	Η Ιθάκη σ' έδωσε τ' ωραίο ταξίδι.
	Χωρίς αυτήν δεν θα βγαινες στον δρόμο.
	Άλλα δεν έχει να σε δώσει πια.
	Κι αν πτωχική την βρεις, η Ιθάκη δεν σε γέλασε.
	Έτσι σοφός που έγινες, με τόση πείρα,
	ήδη θα το κατάλαβες η Ιθάκες τι σημαίνουν.

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Δεν το γράφουν τα λεξικά, αλλά μου το είπαν ψιθυριστά οι σειρήνες της ζωής

	ΥΓ. Δεν το γράφουν τα λεξικά, αλλά μου το είπαν ψιθυριστά οι σειρήνες της ζωής,
	η λέξη Κρίση σημαίνει επίσης, ευκαιρία για νέες ευκαιρίες και απελευθέρωση δημιουργικότητας.
	ΥΓ. Και ποτέ δεν ξεχνώ: …Πάντα στο νου σου νάχεις την Ιθάκη…Το φθάσιμον εκεί είναι ο
	προορισμός σου…Aλλά μη βιάζεις το ταξίδι διόλου…
	http://www.godimitris.gr/index.php?mact=News,cntnt01,detail,0&cntnt01articleid=1909&cntnt01origid=15&cntnt01lang=el_GR&cntnt01returnid=72&hl=greek

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fyrebox

Check this out! My friend's awsome service to create quizzes that can be played on Facebook timeline


Made with Node.js and MongoDB

@fyrebox https://www.fyrebox.co/

jquery's mouse over rotate

	.cross-browser .feature-box-image{
	background: url('i/feature-sprites.png') -278px 0px no-repeat;
	-webkit-transition: all 0.4s;
	transition: all 0.4s;
	position: relative;
	z-index: 10;
	}
	.cross-browser .feature-box-image:hover {
	-webkit-transition: all 0.7s linear;
	-webkit-transform: rotate(6.28rad);
	transition: all 0.7s;
	transform: rotate(6.28rad);
	}

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Adapt.js responsive without bootstrap

What is this?


 Adapt.js is a lightweight (848 bytes minified) JavaScript file that determines which CSS file to load before the browser renders a page. If the browser tilts or resizes, Adapt.js simply checks its width, and serves only the CSS that is needed, when it is needed.



 http://adapt.960.gs/

// Edit to suit your needs.
var ADAPT_CONFIG = {
  // Where is your CSS?
  path: 'assets/css/',

  // false = Only run once, when page first loads.
  // true = Change on window resize and page tilt.
  dynamic: true,

  // Optional callback... myCallback(i, width)
  callback: myCallback,

  // First range entry is the minimum.
  // Last range entry is the maximum.
  // Separate ranges by "to" keyword.
  range: [
    '0px    to 760px  = mobile.css',
    '760px  to 980px  = 720.css',
    '980px  to 1280px = 960.css',
    '1280px to 1600px = 1200.css',
    '1600px to 1920px = 1560.css',
    '1940px to 2540px = 1920.css',
    '2540px           = 2520.css'
  ]
};