activerecord vs mongoid

ActiveRecord vs Mongoid

Иван Немытченко, 7bits, Омск

PHP → Ruby on Rails →freelance →JazzCloud → Tulp → 7bits

2007 - Ruby on Rails


2008 - HAML/SASS


2008 - HAML/SASS

2010 - Coffeescript

→


2008 - HAML/SASS

2010 - Coffeescript

2010 - Tequila RABL

2007 - Ruby on Rails 2008 - HAML/SASS 2010 - Coffeescript 2010 - Tequila → RABL

2011 - Tulp 2012 - MongoDB


2008 - HAML/SASS

2010 - Coffeescript

2010 - Tequila RABL

2012 - ActiveRecord vs Mongoid

→

MongoDB

MongoDB is a scalable, high-performance, open

source NoSQL database“

”

НЕТ ТРАНЗАКЦИЙ

НЕТ ТРАНЗАКЦИЙ

НЕТ ДЖОЙНОВ

Таблицы → Коллекции


Строки → Документы

{ "_id" : ObjectId( "4fb8dd1324ec7c1344000003" ), "agent" : "Ivan Nemytchenko", "challenge" : "Introduce MongoDB documents", "status" : "accepted" }

mailto:[email protected]




{ "_id" : ObjectId( "4fb8dd1324ec7c1344000003" ), "agent" : "Ivan Nemytchenko", "missions": [ { "challenge" : "Introduce MongoDB documents", "status" : "done" }, { "challenge" : "Tell the truth about MongoDB", "status" : "considering" } ] }


Строки → Документы

Индексы → Индексы

MongoidObject Document Mapper

The philosophy of Mongoid is to provide a

familiar API to Ruby developers who have been

using Active Record or Data Mapper, while

leveraging the power of MongoDB's schemaless

and performant document-based design, dynamic

queries, and atomic modifier operations

“

”Durran Jordan, автор Mongoid

Связи

has_many

has_one

belongs_to

has_many

has_one

belongs_to

has_and_belongs_to_many

has_many

has_one

belongs_to


address:

{organization_ids:[1,2,3]}

organization:

{address_ids:[5,3,1,10]}

has_many

has_one

belongs_to


has_many :through

has_many

has_one

belongs_to


has_many :through

embeds_many

embeds_one

embedded_in

Lets Practice!

class Contact include Mongoid::Document field :type field :value embedded_in :placeend

place.contacts << Contact.new(:type => "phone", :value => "32-14-90")place.contacts << Contact.new(:type => "email", :value => "[email protected]")place.save

class Place include Mongoid::Document embeds_many :contactsend



{ "_id" : 1, "name" : "Планета Суши" "contacts" : [ { "_id" : 1, "type" : "phone", "value" : "32-14-90" }, { "_id" : 2, "type" : "email", "value" : "[email protected]" } ] }

{ "_id" : 1, "name" : "Планета Суши" "contacts" : [ { "_id" : 1, "_type" : "phone", "value" : "32-14-90" }, { "_id" : 2, "_type" : "email", "value" : "[email protected]" } ] }

class Contact include Mongoid::Document field :type field :value embedded_in :placeend

place.contacts << Phone.new(:value => "32-14-90")place.contacts << Email.new(:value => "[email protected]")place.save

class Place include Mongoid::Document embeds_many :contactsend

class Email < Contactend

class Phone < Contact end



Rating embedded_in :place

Place embeds_many :ratings

RatingType embedded_in :category

Category embeds_many :rating_types





Place{ "_id" : 1, "name" : "Планета Суши" "ratings" : [ { "_id":1, "type":"Качество обслуживания", "value":4 }, { "_id":2, "type":"Чистота", "value":5 } ] }






Category{ "_id" : 1, "name" : "Рестораны" "rating_types" : ["Качество обслуживания", "Чистота"] }

Place.where(:"ratings.type"=>"Чистота", :"ratings.value.gt"=>3)


Category{ "_id" : 1, "name" : "Рестораны" "rating_types" : ["Качество обслуживания", "Чистота"] }

Property embedded_in :place field :question field :answerPlace embeds_many :properties

Answer embedded_in :question

Question embedded_in :category embeds_many :answers

Category embeds_many :questions

>> category.questions << Question.new(:value => 'WiFi', :answers => ['есть', 'нету'])

>> place.properties << Property.new(:question => 'WiFi', :answer => 'есть')

Place{ "_id" : 1, "name" : ".." "contacts" : [ { "_type" : "phone", "value" : "32-14-90" }, { "_type" : "email", "value" : "..." }], "ratings" : [ { "type" : "..", "value" : ".." }, { "type" : "..", "value" : ".." }], "properties" : [ { "question" : "..", "answer" : ".." }], "categories" : ["..", ".."], "review_ids" : [12, 34, 56] }

Review{ "_id" : 12, "user_id" : 16, "place_id" : 1, "body" : “..”, "comments" : [ { "body" : "..", "user_id" : 1, "user_name" : ".." }, { "body" : "..", "user_id" : 5, "user_name" : ".."}], "ratings" : [ { "type" : "..", "value" : ".." }, { "type" : "..", "value" : ".." }]}

Place

Contacts

Ratings

Properties

Categories →

Category

RatingTypes

Questions

Answers

Review

AuthorSummary

Ratings

Comments

User

Reviews →

Соотношение запись/чтение

Жизненный цикл объекта

Так ли важна целостность данных?

To embed or not to embed?

Extra Stuff

GridFS

gem 'carrierwave-mongoid', :require => 'carrierwave/mongoid'

CarrierWave.configure do |config| config.storage = :grid_fs config.grid_fs_connection = Mongoid.database config.grid_fs_host = app_config['domain'] config.grid_fs_access_url = "/gridfs"end

class PhotoUploader < CarrierWave::Uploader::Base storage :grid_fsend

class Person include Mongoid::Document

field :first_name, :localize => true field :last_name, :localize => trueend

Локализация

{ "_id" : 1, "first_name" : { "ru" : "Иван" }, "last_name" : { "ru" : "Немытченко" } }

Полный фаршclass Person include Mongoid::Document include Mongoid::Timestamps include Mongoid::Versioning include Mongoid::Paranoia

field :first_name field :last_name key :first_name, :last_nameend

Гибридные приложения

https://github.com/a2ikm/activerecord-and-mongoid-sample

class TodoLog include Mongoid::Document field :todo_id, :type => Integer field :title, :type => String field :done, :type => Booleanend

class Todo < ActiveRecord::Base after_create :create_log after_update :create_log private def create_log TodoLog.create( :title => title, :done => !!done, :todo_id => id ) endend



Анти-mongoid

http://alexeypetrushin.github.com/mongodb_model/index.html

This tool exposes simplicity and power of

MongoDB and leverages its differences“

”Алексей Петрушин, автор MongoModel



Спасибо. Давайте поговорим.

@inem

[email protected]



activerecord vs mongoid

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