Teach Me To Code » Screencasts (iPhone/iPod)

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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