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AquaA cool, clear drink of Ruby object persistenceKane BaccigalupiRubyConf 09

AquaA cool, clear drink of Ruby object persistenceKane BaccigalupiRubyConf ‘09

AquaA cool, clear drink of Ruby object persistenceGot unemployment?Relax with CouchDBKane BaccigalupiRubyConf ‘09

AquaA cool, clear drink of Ruby object persistenceORMs are great,but normalization is expensive.# DataMapperclass Mammal include DataMapper::Resource property :my_id, Serial has n, :legsend# ActiveRecordclass Bird < ActiveRecord::Base # properties defined by migrationhas_many, :legsendKane BaccigalupiRubyConf ‘09

AquaA cool, clear drink of Ruby object persistenceCouchDB + Ruby ~= CouchRest# CouchRestclass Reptile < CouchRest::ExtendedDocumentuse_database MY_DBunique_id :my_id property :legs # a collection!endKane BaccigalupiRubyConf ‘09

AquaA cool, clear drink of Ruby object persistenceCouchRest is different from ORMs because:It allows collectionsModels are hashesInstance variables are discardedKane BaccigalupiRubyConf ‘09

AquaA cool, clear drink of Ruby object persistenceWhat defines Ruby object state?Instance variables @my_variableFundamental data Hash key-values, Array values, etc.Kane BaccigalupiRubyConf ‘09

AquaA cool, clear drink of Ruby object persistenceDatabase abstractionsfocus on databases# DataMapperclass Mammal include DataMapper::Resource property :my_id, Serial has n, :legsend# ActiveRecordclass Bird < ActiveRecord::Base # properties defined by schemahas_many, :legsend# CouchRestclass Reptile < CouchRest::ExtendedDocumentuse_database MY_DBunique_id :my_id property :legs # a collection!endKane BaccigalupiRubyConf ‘09

AquaA cool, clear drink of Ruby object persistenceAqua’s goal:Focus on objects object.commit!Kane BaccigalupiRubyConf ‘09

AquaA cool, clear drink of Ruby object persistenceBecause Ruby is awesomeclass Event < Range attr_accessor :nameendrubyconf = Event.new(Date.parse('11/19/2009'), Date.parse('11/21/2009'))rubyconf.name = 'RubyConf 09'rubyconf.include?(Date.parse('11/20/2009')) # true Kane BaccigalupiRubyConf ‘09

AquaA cool, clear drink of Ruby object persistenceHow does Aqua work?Kane BaccigalupiRubyConf ‘09

AquaA cool, clear drink of Ruby object persistenceJust add Aquaclass Useraquatic# ...endKane BaccigalupiRubyConf ‘09

AquaA cool, clear drink of Ruby object persistenceJust add Aquaclass Useraquatic# ...enduser = User.new# ... More stuff happens to the user# saving an objectuser.commit! # commit without the ! also works but raises no errors.Kane BaccigalupiRubyConf ‘09

AquaA cool, clear drink of Ruby object persistenceBehind the sceneuser.commit!Kane BaccigalupiRubyConf ‘09

AquaA cool, clear drink of Ruby object persistenceBehind the sceneserializationuser.commit!{ "class"=>"User", "ivars"=>{ "@username"=>"kane", "@email"=>"baccigalupi@gmail.com", "@password"=>"secret" }}Kane BaccigalupiRubyConf ‘09

AquaA cool, clear drink of Ruby object persistenceBehind the sceneserializationuser.commit!{ "class"=>"User", "ivars"=>{ "@username"=>"kane", "@email"=>"baccigalupi@gmail.com", "@password"=>"secret" }}data postKane BaccigalupiRubyConf ‘09

AquaA cool, clear drink of Ruby object persistenceObjects ~= Documents,&& Documents ~= Hashes# YAML for a Ruby User object--- &id001 !ruby/object:User email: baccigalupi@gmail.com password: secret username: kane# Aqua Serialization for same object{ "class"=>"User", "ivars"=>{ "@username"=>"kane", "@email"=>"baccigalupi@gmail.com", "@password"=>"secret" }} Kane BaccigalupiRubyConf ‘09

AquaA cool, clear drink of Ruby object persistenceSometimes state should not hang around.There is a method for that. class User aquaticattr_accessor :username, :email, :password hide_attributes :passwordendKane BaccigalupiRubyConf ‘09

AquaA cool, clear drink of Ruby object persistenceGoing deeper with embedded objects …class Address# not an aquatic object, just plain rubyattr_accessor :name, :street, :city, :state, :zipend address = Address.new# . . . user = User.newuser.addresses = [ address ]Kane BaccigalupiRubyConf ‘09

AquaA cool, clear drink of Ruby object persistenceOrdinary objectsget serializedinside aquaticobjects{ "class"=>"User", "ivars"=>{"@addresses"=>{ "class"=>"Array", "init"=>[{ "class"=>"Address", "ivars"=>{ "@city"=>"San Francisco", "@name"=>"work", "@street"=>"P0 Box 58", "@state"=>"94102" } }] }, "@username"=>"kane", "@email"=>"baccigalupi@gmail.com" }} Kane BaccigalupiRubyConf ‘09

AquaA cool, clear drink of Ruby object persistenceEmbedded aquatic objects are saved by reference.{ "class"=>"User", "ivars"=>{ # ... "@friends"=>{ "class"=>"Array", "init"=>[{ "class"=>"Aqua::Stub", "init"=>{"class"=>"User", "id"=>"32"} }] } }}class Useraquatic# ...def friends @friends ||= [] endenduser.friends << alex# where alex is another user objectKane BaccigalupiRubyConf ‘09

AquaA cool, clear drink of Ruby object persistenceAqua::Stub~= Lazy DelegateGets the object from the db

Stubs/caches methods{ "class"=>"User", "ivars"=>{ # ... "@friends"=>{ "class"=>"Array", "init"=>[{ "class"=>"Aqua::Stub", "init"=>{"class"=>"User", "id"=>"32"} }] } }}Kane BaccigalupiRubyConf ‘09

AquaA cool, clear drink of Ruby object persistenceStubbing methods in Aqua::Stub{ "class"=>"User", "ivars"=>{ # ... "@friends"=>{ "class"=>"Array", "init"=>[{ "class"=>"Aqua::Stub", "init"=>{ "class"=>"User", "id"=>"32”,"methods"=>{"username"=>"alex"}, } }] } }}class Useraquatic :embed =>{ :stub => :username } # ...endKane BaccigalupiRubyConf ‘09

AquaA cool, clear drink of Ruby object persistenceStubbed behavioruser.reloadfriend = user.friends.firstfriend.class # Aqua::Stubfriend.username# ‘alex’# username was cachedfriend.email# this triggers the database call # for the friend objectKane BaccigalupiRubyConf ‘09

AquaA cool, clear drink of Ruby object persistenceGot Files?{ "class"=>"User", "ivars"=>{ # ..."@avatar"=>{ "class"=>"Aqua::FileStub” "init"=>{ "methods"=>{ "content_type"=>"image/png", "content_length"=>{ "class"=>"Fixnum", "init"=>"26551” } }"id"=>"image_attach.png" }, } }}class Useraquatic # ...attr_accessor :avatarenduser.avatar = my_picKane BaccigalupiRubyConf ‘09

AquaA cool, clear drink of Ruby object persistenceGetting Objects:The basicsUser.load( some_id )user.reloadKane BaccigalupiRubyConf ‘09

AquaA cool, clear drink of Ruby object persistenceIndexed Searchesclass Useraquatic # ...index_on :usernameend" // javascript map functionfunction(doc) { if( doc['class'] == 'User' &&doc['ivars'] && doc['ivars']['@username'] ){ emit( doc['ivars']['@username'], 1 ); } }"User.query(:username, ’kane') # returns an array of all users named kaneKane BaccigalupiRubyConf ‘09

AquaA cool, clear drink of Ruby object persistenceWhat’s next?More querying ease Search on nested variables

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A cool, clear drink of Ruby object persistence

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A cool, clear drink of Ruby object persistence