The Problem is Your Ruby

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The Problem is Your Ruby Thursday, September 22, 11

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The Problem is Your Ruby Jeff Casimir / @j3 Thursday, September 22, 11

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Thursday, September 22, 11

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Rails “Expertise” Thursday, September 22, 11

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Rails is Not a Language Thursday, September 22, 11

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Thursday, September 22, 11

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Ruby Thursday, September 22, 11

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HTML CSS JavaScript Database Design Ruby OO Design UI/UX Testing DevOps Thursday, September 22, 11

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Real Skills Thursday, September 22, 11

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Thursday, September 22, 11

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OO Design Thursday, September 22, 11

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Thursday, September 22, 11

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Thursday, September 22, 11

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Thursday, September 22, 11

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Thursday, September 22, 11

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How I Got Here Thursday, September 22, 11

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Thursday, September 22, 11

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Thursday, September 22, 11

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Thursday, September 22, 11

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Thursday, September 22, 11

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Database Design Ruby Thursday, September 22, 11

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Thursday, September 22, 11

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Thursday, September 22, 11

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Thursday, September 22, 11

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Database Design OO Design Ruby Thursday, September 22, 11

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Collections Thursday, September 22, 11

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Thursday, September 22, 11

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Thursday, September 22, 11

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greens reds Thursday, September 22, 11

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greens reds Thursday, September 22, 11

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greens, reds = candy.partition{|m| m.green?} greens reds Thursday, September 22, 11

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Just One Idea Thursday, September 22, 11

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Thursday, September 22, 11

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Application Thursday, September 22, 11

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Application Module Thursday, September 22, 11

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Application Class Module Thursday, September 22, 11

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Application Class Module Method Thursday, September 22, 11

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Application Class Module Method Line Thursday, September 22, 11

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Application Class Module Method Line Thursday, September 22, 11

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U g Person Business Thursday, September 22, 11

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U g Person Business M Email q Phone First Name Last Name Name Thursday, September 22, 11

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Contact Thursday, September 22, 11

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g Business U Person Contact Thursday, September 22, 11

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class Contact < ActiveRecord::Base has_many :phone_numbers has_many :email_addresses end class Person < Contact def name [last_name, first_name].join ", " end end class Company < Contact end Thursday, September 22, 11

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Reuse via Module Thursday, September 22, 11

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class Person < ActiveRecord::Base include Contact def name [last_name, first_name].join ", " end end class Company < ActiveRecord::Base include Contact end Thursday, September 22, 11

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module Contact def self.included(source) do source.send(:has_many, :phone_numbers) source.send(:has_many, :email_addresses) end end /app/models/contact.rb Thursday, September 22, 11

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module Contact def self.included(source) do source.send(:has_many, :phone_numbers) source.send(:has_many, :email_addresses) end end /app/models/contact.rb Send the message :has_many with parameter :phone_numbers to source Thursday, September 22, 11

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Utility Objects Thursday, September 22, 11

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class Article < ActiveRecord::Base before_validation :sanitize_text def sanitize_text self.body.gsub!("Ilias", "Trolololol") end end class Comment < ActiveRecord::Base before_validation :sanitize_text def sanitize_text self.body.gsub!("Ilias", "Trolololol") end end Thursday, September 22, 11

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module TextDecorator module InstanceMethods def sanitize_text(input) input.gsub!("Ilias", "Trolololol") end end def self.included(source) source.send(:include, InstanceMethods) end end class Article < ActiveRecord::Base include TextDecorator before_validation :sanitize_text end Thursday, September 22, 11

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module TextDecorator def self.sanitize_text(input) input.gsub!("Ilias", "Trolololol") end end /app/lib/text_decorator.rb class Article < ActiveRecord::Base before_validation { TextDecorator.sanitize_text(body) } end class Comment < ActiveRecord::Base before_validation { TextDecorator.sanitize_text(body) } end Thursday, September 22, 11

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Clear over Clever Thursday, September 22, 11

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Refactoring Thursday, September 22, 11

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Thursday, September 22, 11

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Thursday, September 22, 11

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Thursday, September 22, 11

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Scopes Thursday, September 22, 11

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## Rails 2 Way class Article < ActiveRecord::Base named_scope :published, {:conditions => [:published => true]} named_scope :recent, {:limit => 5, :order => "published_at DESC"} end # Usage: Article.published.recent Thursday, September 22, 11

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## Rails 3 Way class Article < ActiveRecord::Base scope :published, where(:published => true) scope :recent, limit(5).order("published_at DESC") end Thursday, September 22, 11

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## Rails 3 Way class Article < ActiveRecord::Base scope :published, where(:published => true) scope :recent, limit(5).order("published_at DESC") end ## Rails 3 using Class Methods class Article < ActiveRecord::Base def self.published where(:published => true) end def self.recent limit(5).order("published_at DESC") end end Thursday, September 22, 11

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class Article < ActiveRecord::Base scope :published, where(:published => true) scope :recent, lambda{|max| limit(max).order("published_at DESC")} end Thursday, September 22, 11

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class Article < ActiveRecord::Base scope :published, where(:published => true) scope :recent, lambda{|max| limit(max).order("published_at DESC")} end class Article < ActiveRecord::Base def self.published where(:published => true) end def self.recent(max) limit(max).order("published_at DESC") end end Thursday, September 22, 11

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AS::Concern Thursday, September 22, 11

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module Contact module InstanceMethods def photo_filename name.parameterize + ".jpg" end end def self.included(source) do source.send(:has_many, :phone_numbers) source.send(:has_many, :email_addresses) source.send(:include, InstanceMethods) end end Normal Ruby Module Thursday, September 22, 11

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module Contact extend ActiveSupport::Concern module InstanceMethods def photo_filename name.parameterize + ".jpg" end end included do has_many :phone_numbers has_many :email_addresses end end Using ActiveSupport::Concern Thursday, September 22, 11

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def self.included(source) do source.send(:has_many, :phone_numbers) source.send(:has_many, :email_addresses) source.send(:include, InstanceMethods) end Send the message :include with parameter InstanceMethods to source Thursday, September 22, 11

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Clarity Wins Thursday, September 22, 11

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The Problem is Your Ruby Thursday, September 22, 11

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The Problem is Your Ruby Rails “expertise” is pointless Focus on Ruby, OO, design Master collections & Enumerable Wrap and reuse code with Modules Favor clarity over brevity Jeff Casimir / @j3 Thursday, September 22, 11