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<!DOCTYPE html>
<html>
<head>
<title>Ruby on Rails</title>
<meta charset="utf-8" />
<script src="slides.js"></script>
</head>
<body style="display: none">
<section class="slides layout-regular template-flatschool">
<article>
<h1 class="centered">
Ruby on Rails
</h1>
<div class="source">
Alexander Pavlenko, <a href="http://twitter.com/Alerticus">@Alerticus</a><br/>
<a href="mailto:alexander.pavlenko@flatstack.com">alexander.pavlenko@flatstack.com</a>
</div>
</article>
<article>
<h3>Modularity</h3>
<ul>
<li>ActionPack</li>
<li>ActiveModel</li>
<li>ActiveRecord</li>
<li>ActiveResource</li>
<li>ActiveSupport</li>
<li>ActionMailer</li>
<li>Railties</li>
<li>Bundler</li>
<li>Rack</li>
</ul>
</article>
<article>
<h3>ActionPack</h3>
<p>From request to response</p>
<ul>
<li>ActionDispatch</li>
<li>ActionController</li>
<li>ActionView</li>
</ul>
</article>
<article>
<h3>ActiveModel</h3>
<p>Logic encapsulation</p>
<ul>
<li>Attributes</li>
<li>Validation</li>
<li>Observing</li>
<li>Callbacks</li>
</ul>
</article>
<article>
<h3>ActiveRecord</h3>
<p>Data persistence</p>
<ul>
<li>Object-relational mapping</li>
<li>Query building</li>
<li>Associations</li>
<li>Transactions</li>
<li>Scheme migrations</li>
<li>Database connection adapters</li>
</ul>
</article>
<article>
<h3>ActiveResource</h3>
<p>For all RESTful goods</p>
<ul>
<li>Connection to remote services</li>
</ul>
</article>
<article>
<h3>ActiveSupport</h3>
<p>Nuts and bolts</p>
<ul>
<li>Caching</li>
<li>Dependencies autoload</li>
<li>Deprecation</li>
<li>Core extensions</li>
</ul>
</article>
<article>
<h3>ActionMailer</h3>
<p>Keeping in touch</p>
<ul>
<li>Emails sending</li>
<li>Emails receiving</li>
<li>Templates</li>
</ul>
</article>
<article>
<h3>Railties</h3>
<p>Tying all together (predictably)</p>
<ul>
<li>Gems and Engines initialization</li>
</ul>
</article>
<article>
<h3>Bundler</h3>
<p>Defining environment</p>
<ul>
<li>List gems and their versions</li>
<li>Require listed gems</li>
<li>Cache gems locally</li>
</ul>
</article>
<article>
<h3>Rack</h3>
<p>Origin of requests</p>
<ul>
<li>Common interface to web-server</li>
</ul>
</article>
<article>
<h1 class="centered">REST</h1>
<p class="centered"><sup>*</sup>Representational State Transfer</p>
</article>
<article>
<h3>HTTP verbs</h3>
<ul>
<li>GET</li>
<li>POST</li>
<li>PUT</li>
<li>DELETE</li>
</ul>
</article>
<article>
<h3>Resource</h3>
<ul>
<li><code>index : GET /items/</code></li>
<li><code>show : GET /items/item</code></li>
<li><code>new : GET /items/new</code></li>
<li><code>create : POST /items/</code></li>
<li><code>edit : GET /items/item/edit</code></li>
<li><code>update : PUT /items/item</code></li>
<li><code>destroy: DELETE /items/item</code></li>
</ul>
<p>Where <code>items</code> and <code>item</code> are collection and collection element identifiers</p>
</article>
<article>
<h3>Routes</h3>
<pre>
resources :items</pre>
<div class="build">
<pre>
resources :items do
member do
get :related
end
collection do
get :popular
end
end</pre>
<pre>
resource :profile</pre>
<pre>
match 'some/path/:id/view' => 'catalog#view', :as => :view_catalog</pre>
<p>
Tip: Read default config/routes.rb file<br/>
Tip: <a href="http://guides.rubyonrails.org/routing.html">guides.rubyonrails.org/routing.html</a>
</p>
</div>
</article>
<article>
<h1 class="centered">ActionController</h1>
</article>
<article>
<h3>Action filters</h3>
<pre>
class ApplicationController < ActionController::Base
before_filter :before
after_filter :after
around_filter :around
private
def before; puts 'before'; end
def after; puts 'after'; end
def around
puts 'before around'
yield
puts 'after around'
end
end</pre>
</article>
<article>
<h3>Action filters</h3>
<pre>
class ApplicationController2 < ApplicationController
prepend_before_filter :before_before
skip_after_filter :after, :if => :something
private
def before_before; puts 'before before'; end
def something; true or false; end
end</pre>
</article>
<article>
<h3>Environment</h3>
<ul>
<li>request</li>
<li>response</li>
<li>params</li>
<li>session</li>
<li>cookies</li>
<li>flash</li>
</ul>
</article>
<article>
<h3>Slim controllers, fat models</h3>
<ul>
<li>Action should not have any business logic</li>
<li>Action should have minimal number of calls to the model</li>
<li>Use <code>rescue_from</code> for exceptions handling</li>
</ul>
</article>
<article>
<h3>Do not even try to reinvent bicycle</h3>
<ul>
<li>Users management: <a href="http://github.com/plataformatec/devise">devise</a></li>
<li>OAuth authentication: <a href="http://github.com/intridea/omniauth">omniauth</a></li>
<li>Roles and permissions: <a href="http://github.com/ryanb/cancan">cancan</a></li>
</ul>
</article>
<article>
<h1 class="centered">ActionView</h1>
</article>
<article>
<h3>Instance variables</h3>
<p>
Controller instance variables are available in views too.
So that if you set @user in controller action, you are able
to render @user.name at your template.
</p>
</article>
<article>
<h3>Template engines</h3>
<ul>
<li><a href="http://www.ruby-doc.org/stdlib-1.9.2/libdoc/erb/rdoc/ERB.html">ERB</a></li>
<li><a href="http://haml-lang.com/">Haml</a></li>
<li><a href="http://slim-lang.com/">Slim</a></li>
<li><a href="http://mustache.github.com/">Mustache</a></li>
</ul>
</article>
<article>
<h3>Break down everything</h3>
<ul>
<li>Layout</li>
<li>Partial</li>
<li>Nested Layout</li>
<li>Partial Layout</li>
</ul>
<p>
Tip: <a href="http://guides.rubyonrails.org/layouts_and_rendering.html">guides.rubyonrails.org/layouts_and_rendering.html</a>
</p>
</article>
<article>
<h1 class="centered">ActiveRecord</h1>
</article>
<article>
<h3>Associations</h3>
<ul>
<li>1:1</li>
<li>1:M</li>
<li>M:M</li>
</ul>
<br/>
<div class="build">
<ul>
<li>has_one</li>
<li>has_many</li>
<li>belongs_to</li>
<li>has_and_belongs_to_many</li>
</ul>
<p>
Tip: <a href="http://guides.rubyonrails.org/association_basics.html">guides.rubyonrails.org/association_basics.html</a>
</p>
</div>
</article>
<article>
<h3>has_one</h3>
<ul>
<li>Current object has no foreign key</li>
<li>There are 0..1 objects referencing current</li>
</ul>
</article>
<article>
<h3>has_many</h3>
<ul>
<li>Current object has no foreign key</li>
<li>There are 0..ꝏ objects referencing current</li>
</ul>
</article>
<article>
<h3>belongs_to</h3>
<ul>
<li>Current object has foreign key</li>
</ul>
</article>
<article>
<h3>has_and_belongs_to_many</h3>
<ul>
<li>Neither current object, nor target object has foreign key</li>
<li>There are additional table with foreign keys cross-link</li>
</ul>
</article>
<article>
<h3>has_one :through and has_many :through</h3>
<ul>
<li>If A has_one B, and B has_one C, that means A has_one C :through B</li>
<li>If A has_one or has_many B, and B has_one or has_many C, that means A has_many C :through B</li>
</ul>
</article>
<article>
<h3>Query Interface</h3>
<ul>
<li>where</li>
<li>select</li>
<li>group</li>
<li>order</li>
<li>limit</li>
<li>offset</li>
</ul>
<p>
Tip: <a href="http://guides.rubyonrails.org/active_record_querying.html">guides.rubyonrails.org/active_record_querying.html</a>
</p>
</article>
<article>
<h3>Scopes</h3>
<pre>
class Resource < ActiveRecord::Base
scope :active, where(:active => true)
scope :latest, order('created_at desc').limit(50)
end
Resource.active.latest</pre>
<p>
Great for logic and adapter-specific SQL encapsulation.
</p>
</article>
<article>
<h3>Callbacks</h3>
<ul>
<li>before_validation, after_validation</li>
<li>before_save, around_save, after_save</li>
<li>before_create, around_create, after_create</li>
<li>before_update, around_update, after_update</li>
<li>before_destroy, around_destroy, after_destroy</li>
<li>after_commit, after_rollback</li>
</ul>
</article>
<article>
<h1 class="centered">Security</h1>
</article>
<article>
<q>No user input data is secure, until proven otherwise, and every parameter from the user is potentially manipulated.</q>
<div class="author">
<a href="http://guides.rubyonrails.org/security.html">guides.rubyonrails.org/security.html</a>
</div>
</article>
<article>
<h1 class="centered">Homework</h1>
</article>
<article>
<ol>
<li>Read mentioned articles.</li>
<li>Be nice :)</li>
</ol>
</article>
<article>
<h3>For the further questions:</h3>
<p>
Google Groups thread:
<a href="https://groups.google.com/forum/#!topic/fs-courses/RMWt61oSFB0">
http://goo.gl/MMcmR
</a>
</p>
<h2>Thanks for the attention.</h2>
</article>
</section>
</body>
</html>