ActiveRecord

ACTIVERECORD Rails 3

MODEL CLASSin app/models/person.rbclass Message < ActiveRecord::Baseend

EVERY MODEL HASA CORRESPONDING DATABASE TABLE

HOW DID WE GETA DATABASE TABLE?

RUBY-DRIVEN SCHEMA• scaffold generates db/migrate/20110131021702_create_people.rb• rake db:migrate runs the migration, creates the table• Watch what we did before in slow motion...

RAILS CONSOLE>> ActiveRecord::Base.logger = Logger.new(STDOUT)

RAILS CONSOLE>> ActiveRecord::Base.logger = Logger.new(STDOUT)>> Person.ﬁrst SQL (1.0ms) SELECT nameFROM sqlite_masterWHERE type = table AND NOT name = sqlite_sequence Person Load (1.0ms) SELECT "people".* FROM "people" LIMIT 1=> #<Person id: 2, ﬁrst_name: "Wilma", last_name: "Flinstone", created_at: "2010-10-19 19:59:36", updated_at: "2010-10-19 19:59:36">

RAILS CONSOLE>> ActiveRecord::Base.logger = Logger.new(STDOUT)>> Person.first SQL (1.0ms) SELECT nameFROM sqlite_masterWHERE type = table AND NOT name = sqlite_sequence Person Load (1.0ms) SELECT "people".* FROM "people" LIMIT 1=> #<Person id: 2, first_name: "Wilma", last_name: "Flinstone", created_at: "2010-10-19 19:59:36", updated_at: "2010-10-19 19:59:36"> find "people" table name

RAILS CONSOLE>> ActiveRecord::Base.logger = Logger.new(STDOUT)>> Person.first SQL (1.0ms) SELECT nameFROM sqlite_masterWHERE type = table AND NOT name = sqlite_sequence Person Load (1.0ms) SELECT "people".* FROM "people" LIMIT 1=> #<Person id: 2, first_name: "Wilma", last_name: "Flinstone", created_at: "2010-10-19 19:59:36", updated_at: "2010-10-19 19:59:36"> find first row in "people table"

DYNAMIC GETTERS AND SETTERS>> bret = Person.new>> bret.ﬁrst_name = "Bret">> bret.last_name = "Smith">> bret.ﬁrst_name"Bret">> bret.xxxNoMethodError

MORE ACTIVE RECORD• save to database as needed• automatically handle update/insert• dynamic queries

SQL INJECTION

SAFE FROM SQL INJECTIONclass User < ActiveRecord::Base def self.authenticate_unsafely(user_name, password) find(:first, :conditions => "user_name = #{user_name} AND password = #{password}") end def self.authenticate_safely(user_name, password) find(:first, :conditions => [ "user_name = ? AND password = ?", user_name, password ]) end def self.authenticate_safely_simply(user_name, password) find(:first, :conditions => { :user_name => user_name, :password => password }) end

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ActiveRecord

by Blazing Cloud on Apr 03, 2011

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