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David Padilla @dabit

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www.magmaconf.com

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Web applications with Ruby (not Rails)

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I invented MVC on ASP Classic

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Not really

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<% set conn=Server.CreateObject("ADODB.Connection") conn.Open "northwind" %> Super App

Page 1

<% ' Some code here that connects to the DB and ' displays stuff %> page1.asp

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<% set conn=Server.CreateObject("ADODB.Connection") conn.Open "northwind" %> Super App

Another Page

<% ' Some code here that connects to the DB and ' displays stuff %> AnotherPage.asp

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Index.asp Super App <% page = Request.QueryString("page") Select Case page Case "page1" %> <% Case "AnotherPage" %> <% End Select %>

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2000

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MVC

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http://therantygirl.ﬁles.wordpress.com/2012/07/happy-cat.jpg

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Mid Programmer Life Crisis

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Programming Web applications with Rails is BORING

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Building websites with Rails is not ENOUGH programming

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Most of us don’t know what’s going on outside of Rails

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We used to have all these problems

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We used to actually write SQL

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Bring programming back

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Web applications with Ruby (not Rails)

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Rack

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Rack is cool as Bow Ties

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Web Server Web Application A hash with request headers

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Web Server Web Application A hash with request headers respond_to(:call)

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Web Server Web Application A hash with request headers

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[http_code, headers, body]! Integer Hash Responds to :each

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Web Server Web Application [http_code, headers, body]!

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run -> (env) { puts env [200, {}, []] } conﬁg.ru

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Live Code

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Router

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/posts PostController #index

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Models

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ActiveRecord::Base

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require 'active_record' ! class User < ActiveRecord::Base #... end model/user.rb

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Sequel

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model/user.rb require 'sequel' ! DB = Sequel.sqlite ! class User ! def self.all DB[:users].to_a end ! end

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pg ! mysql

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model/user.rb require 'pg' ! DB = PG.connect( dbname: 'test', host: 'localhost') ! class User def self.all result = DB.exec "SELECT * FROM users" fields = result.fields result.collect do |row| hash = {} row.each_with_index do |value, i| hash[fields[i]] = value end end end end

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One last piece of advice

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Don’t actually do this

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Logging Caching Database Pooling Sessions Cookies Security

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Read code

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Try to understand how things work

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Write your own framework!

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<3 Rails Core Team

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Disclaimer: I do NOT actually think that writing web applications with Rails is BORING