Ruby on Rails All Hands Meeting

Ruby on Rails,
Apache httpd, and Oracle
Dan Davis
davisda4@mail.nlm.nih.gov
B1N14Q

Overview
 Why this Talk?
 Ruby on Rails
 Fast prototyping (demo)
 Integrating with Apache httpd
 Integrating with Oracle
 Maybe demo

Why this Talk?
 Node.js, MongoDB, and Express were cool
 Lots of Rapid Prototyping Environments
• Ruby on Rails (Digital Collections)
• ColdFusion (many things)
• php (Cake)
 Secure, Reliable, Transparent Data
 Integration

Why Ruby on Rails?
 How I started: a great application
 MVC
• Rapid prototyping
• Separation of Concerns
• Generators
 Unit and Integration Testing
 Security is built-in
 Community
 Library of “gems”

Ruby Overview
 General Purpose
 Innovative Class and Object model
 Domain Specific Languages
 Lamdas (function objects), Blocks, and Mixins
 JRuby

Class and Object model
•Everything is an Object
•Module – namespace, interface, behavior
•Class – inheritance, instantiation

Ruby - Domain Specific Languages
 Implicit Hash, no parents
doit first, second, :k1 => v1, :k2 => v2
doit first, second, k1: v1, k2: v2
 Comes from Functional Programming
(FORTH, Tcl, Ruby, Python)
 Examples Today
• Gemfile
• Routing
• Rspec Tests (BDD)

Ruby - Lambdas and Blocks
 Lambdas – function objects
l = lambda ( “There is no try” )
Puts l.call
 Blocks – are implicit arguments
def implicit_block(number)
puts yield(number)
end
implicit_block(7) { |number| number + 1 }
 Blocks – sometimes explicit
def explicit_block (number, &block)

Ruby - Mixins
 Can include a module
class AccountController
include AccountHelpers
…
 Can extend a module
bar = Bar.new
bar.extend Foo
 Can re-open objects
class String
def empty?
end
 Changes API Design

Ruby - jruby
 ruby is like perl – C with links to libs
 jruby is JVM implementation
 jruby starts slow, gets fast
 Not quite transparent
• Some “gems” implemented differently
• Some “gems” not available
• Cannot call SWT/Swing from ruby!
• Higher bar to start

Rails - Generators
 Application
rails new demoapp
 Model
rails generate User name:string
email:string password_hash:string
 Migration
rails g migration AddRoleToUser
 Controller
rails g controller Users all view edit
 Integration Test
rails g integration_test AccountSettings

Ruby - Gemfile
 Tracks dependencies (like Ivy, Maven)
 Example of Domain Specific Language
 Easy
# Use jquery as the JavaScript library
gem 'jquery-rails', '~> 3.1.0'
gem 'jquery-datatables-rails'

Rails - Routing
 config/routes.rb
Nedtable::Application.routes.draw do
get ‘users’, to: ‘users#all’
post ‘users’, to: ‘users#create’
get ‘users/:id’, to: ‘users#view’
get ‘users/:id/edit’, to: ‘users#edit’
post ‘users/:id’, to: ‘users#update’
end
 See it in web
 See it on the console

Rails - rspec
 Behavioral Driven Testing
 Easy to read
describe MarcExporter do
it { should respond_to :to_marc }
it { should respond_to :reader }
…
describe "for NLM UI 1589530" do
…
its(:to_xml) { should == xmldata }
its(:to_marc) { should == mrcdata }
end
 “Mock” network connections

Rails - security
 CSRF
• automatically adds to form
• Automatically checks
 Injection
• You never have to write SQL
• Automatically wraps SQL/XML
 CSS - Safe by default
<%= “<br/>”.html_safe() %>

Rails - So much more
 Asset Pipeline
 Layouts
 Engines
 “gems” and more “gems”

Why Apache2? Why Oracle?
 Good Tools give you:
 Shoulders to stand on (powerful abstractions)
 Without compromising flexibility
 Good Architecture:
 Same thing at Project level
 Good Standards:
 Same thing at Organizational Level

Apache2 – nlm.conf
<Location /solr>
ProxyPass ajp://localhost:8009/solr
ProxyPassReverse ajp://localhost:8009/solr
Options -MultiViews
Order allow,deny
Allow from 130.14.160.225/24
AuthType CAS
AuthName "NLM Login"
CASScope /
Require user davisda4 butlerj pantr
CASAuthNHeader REMOTE_USER
</Location>

Oracle - Benefits
 Reliable
 Secure
 XMLDB is included
 Transparent – SQL Developer/Toad
 Oracle Support in OSS evaluation
• Measures maturity
• Measures Enterprise readiness

Oracle – link to Rails
 Gemfile
gem 'ruby-oci8', '~> 2.1.0'
gem 'activerecord-oracle_enhanced-adapter’
 config/database.yml
development:
adapter: oracle_enhanced
database: 'oltp01_dev'
username: 'discovery'
password: ‘cleartext’
 Integrating getDBPassword
password: <% `getDBPassword …` %>
 Multiple Databases
establish_connection :serials

Let’s Build Something
 ER Diagram
 Navigational State Diagram

Cheat sheet #1
 Create Application
rails new allhands –T
cd allhands
 Update Gemfile and get dependencies
vim Gemfile
bundle update
bundle install
 Integrate dependencies through generators
rails g devise:install
rails g active_admin:install
rake db:migrate

Cheat sheet #2
 Create Models
rails g model Person …
rails g model OrgUnit …
rake db:migrate
rails g active_admin:resource Person
rails g active_admin:resource OrgUnit
 Fix Saving the Data
 Fix “associations”, e.g. foreign keys
 Add graphviz integration
 How much code did I write?

Takeaways - Learning
 Ms. Frizzle
• Make mistakes
• Try things
• Get messy
 Learning is Fun
• Cold Fusion MVC frameworks?
• Call Java libraries from CFML?
• Call jruby libs from CFML?

Ruby on Rails All Hands Meeting

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