My Equipment:

• Mackie PROFX12 12-Channel Compact Effects Mixer with USB
• Sony MDR7506 Professional Large Diaphragm Headphone
• Roland R-05 Studio WAVE/MP3 Recorder
• Transcend 32 GB Class 10 SDHC Flash Memory Card (TS32GSDHC10E) (for the Roland R-05)
• Griffin Technology iMic USB Audio Device
• Doctor Who TARDIS USB Hub Doctor Who TARDIS USB Hub Model #DR115
• QuickVoice Recorder
• Rolls MM11 Microphone Muting Switch Designed to Temporarily Mute a Balanced XLR Signal
• Heil PR-40 Dynamic Studio Recording Microphone
• Heil Sound SM-2 Shockmount for PR-30 and PR-40 Champagne
• Heil Sound PL-2T Overhead Broadcast Boom (Standard)

Podcasting Club Setup:

• Behringer Xenyx 802 Premium 8-Input 2-Bus Mixer with Xenyx Mic Preamps and British EQs
• Shure SM58-CN Cardioid Dynamic Vocal Microphone with Cable
• On Stage Foam Ball-Type Mic Windscreen, Black
• Hamilton Nu-Era Tabletop Mic Stand
• JVC HA-V570 Supra-Aural Headphones

When preparing to add some layout features to JotRod, I realized it was a Rails 3.0.9 application. Here’s a quick rundown on upgrading to Rails 3.1.3.

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In order to get someone a timeline in JotRod, we need followers and following lists to compile the Jots from. This means that we need to add a new ColumnFamily called Followers and another one called Following. We don’t have the joins capability from relational databases to do this for us.

I’m going to hijack the User model’s database connection to create the ColumnFamilies. (We don’t have migrations, yet.) Here’s what I ran in the rails console:

cf_def = CassandraThrift::CfDef.new(:keyspace => "JotRod", :name => "Followers")
User.connection.add_column_family(cf_def)
cf_def = CassandraThrift::CfDef.new(:keyspace => "JotRod", :name => "Following")
User.connection.add_column_family(cf_def)

Now that we have the ColumnFamilies, I want to have syntax like this to define the relationships on the User model:

list :followers, :User
list :following, :User

This should provide the following API:

#followers – returns an array of users as specified from the Followers ColumnFamily
#followers<<(user)  - adds the user to the User object’s followers list if it’s not already there

and a similar API for following.

Sandra’s repository

JotRod’s repository

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In the Jots (like tweets) in JotRod, I needed to generate a hash on creation as the key for the Jots. So, I determined that the easiest way to do that was to include ActiveModel Callbacks.

The module is pretty simple to add to your classes. Here’s a demo of how to add it to Sandra.

Sandra’s repository

JotRod’s repository

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Here’s an introduction to creating a Rails connector gem for an ORM with a model generator.

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When I started playing with Cassandra, I wound up writing part of an ORM to get what I needed from it.

I want to build actual projects with Rails, Ruby, or other technologies for my videos rather than just narrowly demonstrate a piece of technology. So, I’m bringing you up to speed with Sandra so that as I continue with the Twitter Clone, you’ll know what I’m using and why I’m adding things to it.

Sandra is available on Github at https://github.com/charlesmaxwood/sandra

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I’m working on another Cassandra demo, but didn’t have time to finish, so I decided to show you Ruby Koans. It’s a very interesting test-driven approach to learning Ruby. I hope you enjoy it.

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You can get cassandra at cassandra.apache.org and the ruby gem by running:

gem install cassandra

I did run into a problem with the trift_client gem when installing. If you get a Load Error, run this.

sudo chmod 644 /usr/local/lib/ruby/gems/1.8/gems/thrift_client-0.6.3/lib/thrift_client/*.rb
sudo chmod 755 /usr/local/lib/ruby/gems/1.8/gems/thrift_client-0.6.3/lib/thrift_client/connection

Here are some of the Cassandra commands from the video:

#connects to the cassandra server using the Twitter keyspace
store = Cassandra.new(“Twitter”)

# create a new column family in the Twitter keyspace called Users
cf_def = CassandraThrift::CfDef.new(:keyspace => “Twitter”, :name => “Users”)
store.add_column_family(cf_def)

# add or create a row to the column family
store.insert(“Users”, “cmaxw”, {“name” => “Charles Max Wood”, “description” => “Awesome coder”})

# remove a column from a row
store.remove(“Users”, “cmaxw”, “description”)

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With the recent release of the Google Plus beta (ask me for an invite if you want one), I felt it appropriate to show a simple way to create a Like or +1 button for your Rails application. The app and concept is pretty simple, so I won’t worry about posting the code below.

Install:

gem 'make_flaggable', :git => 'git://github.com/cavneb/make_flaggable.git'
bundle install
rails generate make_flaggable
rake db:migrate

Models:

class Article < ActiveRecord::Base
  make_flaggable :like
end

class User < ActiveRecord::Base
  make_flagger
end

Links:

https://github.com/medihack/make_flaggable

https://github.com/cavneb/make_flaggable

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Specification

• Clicking a star rating turns on the stars to the left of the star I clicked.
• Clicking a star submits the star rating.
• When I refresh the page, the star ratings should be persistent.

We’ll be using Rails’ functions including:

• form_for
• hidden_field
• Rails Helpers

We’ll be using jQuery functions including:

• click
• each
• ajax

<code>
<% form_id = “movie_#{movie.id}_rating” %>
<%= form_for movie.ratings.last || movie.ratings.build, :html => {:id => form_id , :class => “star_rating_form”} do |f| %>
<%= f.hidden_field :movie_id %>
<%= f.hidden_field :stars, :id => form_id + “_stars” %>
<% end %>
<% (1..5).each do |i| %>
<li id=”<%= form_id %>_<%= i %>” data-stars=”<%= i %>” data-form-id=”<%= form_id %>”></li>
<% end %>
</code>

<code>
var set_stars = function(form_id, stars) {
for(i=1; i <= 5; i++){
if(i <= stars){
$(‘#’ + form_id + ‘_’ + i).addClass(“on”);
} else {
$(‘#’ + form_id + ‘_’ + i).removeClass(“on”);
}
}
}

$(function() {
$(‘.rating_star’).click(function() {
var star = $(this);
var form_id = star.attr(“data-form-id”);
var stars = star.attr(“data-stars”);

$(‘#’ + form_id + ‘_stars’).val(stars);

$.ajax({
type: “post”,
url: $(‘#’ + form_id).attr(‘action’),
data: $(‘#’ + form_id).serialize()
})
});

$(‘.star_rating_form’).each(function() {
var form_id = $(this).attr(‘id’);
set_stars(form_id, $(‘#’ + form_id + ‘_stars’).val());
});
});
</code>

For a basic deployment recipe, check out Basic Deployment with Capistrano

This episode demonstrates how to extend deployment to deploy to stage and production. Overall it’s rather simple. All it entails is creating a new task for each stage you want to deploy to with the settings you need changed.

Here’s an example:

task :stage do
role :web, “stage.teachmetocodeacademy.com” # Your HTTP server, Apache/etc
role :app, “stage.teachmetocodeacademy.com” # This may be the same as your `Web` server
role :db, “stage.teachmetocodeacademy.com”, :primary => true # This is where Rails migrations will run

set :deploy_to, ‘/var/www/stage-teachmetocodeacademy/’
set :user, ‘deploy’
end

That will allow you to run `cap stage deploy` to deploy to your staging environment.

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Polymorphic associations are very simple, as are many-to-many associations. When you blend the two, it’s not nearly as simple. Since there isn’t a working build-in mechanism for many-to-many polymorphic associations.

Here’s a quick demo of what happens if you try to set up a traditional has_many :through association with a polymorphic association. I also show how to set things up so you can get the associated objects.

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I had several requests in UserVoice to provide a Many to Many tutorial in Rails. This is a demonstration of how to put together a “has and belongs to many” association and a “has many through” association.

This is somewhat basic to Ruby on Rails, but important if you need to associate different models.

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On the Ruby Rogues podcast I mentioned that I had moved away from Cucumber to RSpec and Capybara for my integration tests. Here’s a demo on how to do some TDD with RSpec and Capybara.

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CoffeeScript offers more than nice syntax for setting and managing data and functions. It also offers Classes, Inheritance, access to a ‘super’ method, Ruby-style string interpolation, easy variable and function bindings, and chained comparisons.

Here’s the code I showed in the video:

class Vehicle
  constructor: (@name) ->

  move: (miles) ->
    console.log @name + " drove " + miles + " miles."

class VWBug extends Vehicle
  move: ->
    console.log "Cruisin'..."
    super 100

class Truck extends Vehicle
  move: ->
    console.log "Haulin'..."
    super 50

mater = new Truck "Mater"
herbie = new VWBug "Herbie"

mater.move()
herbie.move()

a1c = "7.6"

healthy = 7.0 > a1c > 5.0

console.log "A1C within healthy range: #{a1c}"

Account = (customer, cart) ->
  @customer = customer
  @cart = cart

  $('.shopping_cart').click (event) =>
    @customer.purchase @cart

If you’re new to CoffeeScript, make sure you check out the CoffeeScript Cookbook and CoffeeScript Basics.

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Ruby on Rails 3.1 is moving to use Sprockets to compile CoffeeScript into JavaScript and include JQuery in it’s JavaScript by default.

This is a quick demo of how it all hangs together to manage your JavaScript in Rails 3.1.

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CoffeeScript is now going to be a default installation with Ruby on Rails. So, I installed CoffeeScript and NodeJS and have been playing with it for the last hour or so.

Here are the basics you need to know to use CoffeeScript including functions, arrays, hashes (objects), control functions (if, else, unless) and loops.

In my opinion it is friendlier than JavaScript and more terse, but I don’t feel like it’s a huge win over JavaScript. That being said, it is something I’m likely to use in the future.

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Single Table Inheritance is a great way to handle related models that descend from the same class. The classic example is a Car class with Ford, Chevy, and Honda subclasses.

This Ruby on Rails Tutorial provides an example and explains how Rails puts all of the information in the same database table and allows you to query things from both the superclass and subclass.

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In preparing to show off SASS, I found the Compass system, which uses SASS and organizes your stylesheets in a unique way. In this tutorial, I walk you though installing compass, installing the 960 grid system, and organizing your SASS stylesheets in an intelligent way.

One note, I couldn’t remember the URL for the 960 grid system. It’s http://960.gs

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This is a basic demonstration of adding a rake task to Ruby on Rails. Some of the same principles apply to Rake in general. You also see how to call out to the command line and how to convert ERB and HTML to HAML.

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This is a basic implementation of creating bookmarks for our delicious clone using the Rails built in REST.

I also found out that you need the haml-rails gem in order to get your views to generate in HAML.

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In this installment in the Delicious Clone, we use CanCan to set some permissions on the Bookmarks Controller.

Next week, we’ll finish the bookmark creation process and the following, we’ll add styling with SASS.

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Run your tests faster with parallel_tests gem using all the cores you have on your computer.

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This is a quick demonstration of how to switch your Rails 3 application to HAML from ERB.

Because I’m going to be testing in cucumber sections of the site that require a user to be logged in, I decided to get it out of the way. So, in this video, I write a cucumber feature to test login and round it off with a few tests on the devise generated user model to make sure it continues to behave as I expect it to as I update it throughout the process of building this application.

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Here is what I’ve done to create this application:

1. Use the ‘rails new’ command to create a rails application
2. Set up the Gemfile
3. Configure the Database
4. Install Cucumber
5. Install Rspec
6. Install Devise
7. Install CanCan
8. Install jQuery
9. Configure Devise

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This video demonstrates how to build a countdown timer with the setInterval function in Javascript, a text field, and jQuery to update your text field.

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Capistrano has been the most popular way to deploy Ruby and Rails applications for a long time. This video provides a quick demonstration of a basic recipe for deploying a Rails 3 application.

I made this video a while ago and I realized that I never posted it. Here is a very basic recipe for deploying with Capistrano.

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I’m trying something new and using the YouTube player. Let me know if you see any differences.

In this video, I demonstrate how to create, merge, and delete local and remote branches in Git.

Git is a Source Control Management system written by Linus Torvalds for managing development on the Linux operating system.

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Twitter just turned off Basic Auth and is forcing application developer to use OAuth. Here is a demonstration of how to add Twitter OAuth to your Ruby on Rails Application.

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Sinatra has a really nice DSL. You can fake the basics of the DSL with some simple Rack middleware created by metaprogramming.

If you like the screencasts, please give $5 to help me get to RubyConf

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Rack is the basis for most major web frameworks in Ruby (like Ruby on Rails.) This video gives a basic overview on how it is used and what features make it a powerful component for Ruby Web Frameworks

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This is the continuation of the Rails 3 Build a Blog series. This episode includes implementation of the Edit and Destroy methods on the Posts Controller. There are a lot of things left to cover on Rails 3, but this gets you the basics of the MVC framework and how to use Cucumber to build your application using BDD.

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In this screencast, I show you how to generate the api and guides for offline viewing.

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This video goes over some issues that popped up while upgrading a Rails 3 application to the Release Candidate

This video goes over some issues that popped up while upgrading a Rails 3 application to the Release Candidate.
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Quick Ruby Tip: The inject method is useful for aggregating data across a dataset. For example a summation could be done with inject (by aggregating each number into the sum.)
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The second part of the tutorial for building a blog with Ruby on Rails version 3. We demonstrate how to set up some basic routes, manage the controller and views, and create a basic form for creating posts.
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Every good project needs a good setup. In this episode, I set up a github repo, create a new rails application, hook in Cucumber and Rspec, write a Cucumber feature, and write the code to make it pass.
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RSpec gives us many powerful tools to make our tests readable. Matchers allow us to provide custom predicates to our should statements that succinctly define the behavior of our code.
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This is an introduction to Ruby metaprogramming where I cover two different ways to define a method. The idea actually started as a joke, but there are valuable lessons to be learned here.
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Shoulda is a framework that sits on top of Test::Unit and adds a ton of nice features like macro’s, nested context, and the ability to create custom tests in a block-based DSL.
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RSpec provides an extremely concise way of representing simple tests to be called on new instances of a class or on explicitly defined receiver objects. You can do this by using ‘subjects’ either as defined by the ‘describe’ or the ‘subject’ methods.
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Maintainability of your code can be measured in many different ways. Jake Scruggs has combined several of the tools that measure you code into one Ruby Gem: metric_fu.

Here’s a demonstration. Go check it out!
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Ruby uses special characters to define certain data types. If you wish to use these characters in your data types, you need to escape them or use percent functions.

Percent functions are much simpler.
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Ruby on Rails allows you to nest models within a form. Ryan Bates of Railscasts demonstrated how to set up these forms with JavaScript using the Prototype framework, which ships with Rails.

In this episode, Charles Max Wood gives a brief overview of how Ryan’s code works, and then refactors the JavaScript to use JQuery.

Ryan Bates demonstrated how to build a form with nested attributes in Ruby on Rails with Prototype. This screencast demonstrates how to refactor that form into usage of jQuery.
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RVM is a program that allows you to install and manage multiple versions of Ruby and Gems. This setup is ideal for testing your application or gem (library) against multiple versions of Ruby.

Also, if you’re looking into Rails 3 on Ruby 1.9 this is a great way to try it out.

Are you thinking about moving your application to Ruby 1.9? Do you have a gem or plugin you need to test in multiple Ruby versions?

RVM is your tool. It allows you to manage and install multiple Ruby versions and the gems installed under each version.
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Loading multiple Ruby Gems can result in runtime errors when an incompatible version of a gem dependency is already loaded as a dependency of another gem.

Gem bundler can also pre-load and cache gems for faster loading.

Having two gems that require different versions of the same dependency can sometimes cause runtime errors. Yehuda Katz and Carl Lerche have created an elegant solution in the Gem Bundler.
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In this screencast, I cover how to use custom Grails configurations along with filters to enable url-based site skins.
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Are you new to Ruby and want to get a head start? In this screencast, I discuss some of the most common methods and techniques that have to do with strings, arrays and hashes. This is also excellent for those coming from other languages.
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In this screencast, we continue on our task of creating a ‘Stack Overflow’ clone by adding more domain classes and relationships between them. We also cover how to test your classes using integration tests.
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Are you new to Grails? Grails is an excellent alternative to Ruby on Rails, which uses Groovy / Java. In this screencast, learn how to create a simple CRUD system with Grails.
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In this screencast, I cover how to create an admin section with a separate login, and describe how nested controllers work.
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Create a Ruby on Rails Jukebox Application and implement the “permalink” feature instead of the usage of “ID”. Taking advantage of the “Counter Cache” you will be able to automatically keep track of the number of Albums asociated with each Artist. The last part spicy up the application with the usage of the Themes plugin for Rails.
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Want to know the basics of CSS? Watch this screencast and learn everything you should know as a web developer. We’ll cover the basics which include colors, borders, padding, margins, lists, fonts, backgrounds, tables, links and floats. This is a very basic screencast, so if you are already familiar with these topics, this might be just a review for you.
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Learn how to spawn background processes using Ruby and the Process class. Here we discuss the difference between ‘wait’ and ‘detach’.
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In this screencast we’ll cover using variables, mixins and operations with LESS while building the header for the our Flitter front end.

In this screencast we’ll cover using variables, mixins and operations with LESS while building the header for the Flitter front end.
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In this screencast we’ll cover the basics of setting up a LESS file to compile into CSS as we provide an HTML front end to Flitter, a Ruby on Rails Twitter clone.
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Tim Harper (tim.theenchanter.com) presents a 13 minute tour of some of his favorite bash features that he uses on a daily basis. The font size is tiny, so be sure to watch it in full screen.
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This is the third and final episode on introduction to MongDB. In this screencast, we demonstrate MongoMapper and how to use it in a Rails app.
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In this screencast we’ll cover aligning floated elements on an HTML page using jQuery, the jQuery Masonry plugin and CSS.
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This is the second part of the series on MongoDB. In this screencast, we create a small Sinatra app called YASI that accesses the data using MongoDB. Get the code at http://blog.rubyhead.com/files/yasi.zip
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In this screencast, you will see the basic CRUD operation using MongoDB shell. This is the first installment of a series on MongoDB.
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In this concluding episode, we go over how to add search functionality to our Flitter application, and add a ‘follow / unfollow’ button which uses AJAX. This is the last of the 6-part series on how to create a Twitter Clone using Ruby on Rails.
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As I run the final stretch to see if I can get a RubyConf ticket, I decided to create a little tool to help me out. If you visit http://search.twitter.com, you will see that they have a search page that auto updates when new tweets have been posted with certain keywords. I can’t watch the site all day, so I decided to write a little tool that will flash the messages on my screen using Growl. Here’s how I did it.
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The saga continues. Here we learn how to add the friends list to your application and we use AJAX to add/remove friends.
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We’re almost done! The remaining screencasts are already recorded, but not edited yet. To speed things up, I split it up into 3 or 4 screencasts. This one shows how to make the site look and feel like Twitter and also populates the right side column content. A bit of CSS, lots of Rails, and more of my ramblings
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Don’t want to take the time to create a layout for your new Ruby on Rails application? Don’t worry. Use the Themes plugin! In this screencast, I show you how to easily add a layout with built-in menus to your existing Rails application using only 1 line of code.
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Have you ever wanted to run a script or command from the command line and insert data into your rails application?, watch this this screencast and you will see the basics of how to interact with your rails application, starting from the irb ruby shell to the usage of the rails console and entering data into a rails application form a Linux shell prompt using the runner.

To ilustrate this screencasts some basic ruby scripts are used to generate our base of characters for a very simple dictionary generation using nested blocks.
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In this screencast, we continue our challenge of creating a Twitter clone called ‘Flitter’ using Ruby on Rails. We learn how to use jQuery to create a countdown for the text area box. We also set up adding and removing friends via the interface. Oh… you hear my baby cry and my sister-in-law call. Fun stuff
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Now that we have a backbone to our ‘Flitter’ application, we learn how to create the front end and tie it all together. In this screencast, I cover a lot of CSS and getting your site to look good. I apologize for it lasting 1 hour, but I decided it’s better than chopping it up.
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In this screencast you will see how to make a rails application capable of parse and execute shell commands using the ruby function %x

The screencast start with basic shell commands, creation of a ruby script demonstrating the concept and finally follow the recipe of 10 easy steps to build your rails shell application.
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Learn how to save data such as bank information, social security number, or other sensitive information in your Rails application securely by encrypting the data. By using spikex’s gem Strongbox, you can use private and public keys to secure your data in your database to where you must have the password to decrypt them.
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Ruby on Rails gives you some simple but powerful tools for mapping URL’s and HTTP Verbs to your Controllers and Views. Here is a simple walkthrough of 4 of these ‘Routes’: default routes, regular routes, named routes, and RESTful routes.
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In this screencast, I show you how to use the Twitter gem to connect to Twitter, and we clarify some of the difficulties that comes with learning OAuth.
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This is a screen-cast explaining how to use blocks in ruby.
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Quick demonstration on how to create a HD Video that looks sharp on Vimeo.com. I just go over the settings required for creating and exporting the video.
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In this series, I attempt to recreate a twitter style application called ‘Flitter’. In this installment, I show you how to create an authenticated system easily using existing tools. I also show how to generate test data to simulate an active application. Finally, you will learn how to set up self-referencial associations.
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An introduction to GitHub, which includes how to create new repositories, set up your account, push and pull, clone and send pull requests.
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This is a basic introduction to integration testing with cucumber. In it, I describe how to use cucumber and rspec to implement a feature in a web application, emphasizing the importance of writing tests before code, which is often referred to as TDD (test-driven development) or BDD (behavior-driven development, a refinement of the original TDD).
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Learn how to create a simple plugin using Ruby on Rails. This video will teach you how to turn a view helper into it’s own plugin, and extend the ActionView::Base.
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