Mongoid in the real world
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Mongoid is an object document mapper (ODM) for MongoDB that allows developers to work with MongoDB documents as objects. Some key features of Mongoid include defining document schemas with fields and associations like references and embeds, validation support, indexing, integration with Rails caching and authentication frameworks like Devise, and dropping down to the lower-level MongoDB driver when needed for performance. Mongoid aims to provide an everyday ORM solution for MongoDB along with features for testing, searching, and file uploads.
![Defining Indexes
# unique
index :ssn, :unique => true
# Compound indexes
index([
[ :first_name, Mongo::ASCENDING ],
[ :last_name, Mongo::ASCENDING ]
])
# Foreign Key indexes
referenced_in :post, :inverse_of
=> :comments, :index => true](https://image.slidesharecdn.com/mongoidintherealworld-101215133239-phpapp02/85/Mongoid-in-the-real-world-20-320.jpg)
![Monkey Patched Step Definition
# features/step_definitions/mongoid_steps.rb
Given /^an? (.+) exists with an? (.+) of "([^"]*)"$/
do |model, field, value|
factory_name = model.gsub(' ', '_')
Factory factory_name, field => value
end](https://image.slidesharecdn.com/mongoidintherealworld-101215133239-phpapp02/85/Mongoid-in-the-real-world-34-320.jpg)
Mongoid in the real world
- 1. Mongoid in the Real World Toronto Ruby Brigade Kevin Faustino December 14, 2010 @kfaustino http://adventuresincoding.com
- 2. Thanks to our sponsors
- 4. Object Document Mapper
- 6. Using Mongoid Everyday Mongoid Integrations
- 8. class Post include Mongoid::Document end
- 9. Types
- 10. class Post include Mongoid::Document include Mongoid::Timestamps field :title field :content field :published_on, :type => DateTime field :slug end
- 11. Valid Types Array, BigDecimal, Boolean, Date, DateTime, Float, Hash, Integer, String, Symbol, Time
- 12. Associations
- 13. class Person include Mongoid::Document field :first_name field :last_name embeds_one :address end class Address include Mongoid::Document field :street field :city embedded_in :person, :inverse_of => :address end
- 14. { "_id" : ObjectId("4d06eaa46c50a1031a000001"), "address" : { "_id" : ObjectId("4d06eade6c50a1031a000002"), "street" : "123 Liberty St.", "city" : "Toronto" }, "first_name" : "Kevin", "last_name" : "Faustino" }
- 15. class Blog include Mongoid::Document references_many :posts end class Post include Mongoid::Document referenced_in :blog end
- 16. { "_id" : ObjectId("4c9f54866c50a10a75000003"), "blog_id" : ObjectId("4ca531c46c50a12d1b000002"), "content" : "What is Faraday? ...", "featured_image_filename" : "faraday.jpg", "slug" : "building-modular-http-client-code-with- faraday", "title" : "Building modular HTTP client code with Faraday", }
- 17. Validations
- 18. ActiveModel Validators + More validates_acceptance_of validates_associated validates_confirmation_of validates_exclusion_of validates_format_of validates_inclusion_of validates_length_of validates_numericality_of validates_presence_of validates_uniqueness_of
- 19. Indexing
- 20. Defining Indexes # unique index :ssn, :unique => true # Compound indexes index([ [ :first_name, Mongo::ASCENDING ], [ :last_name, Mongo::ASCENDING ] ]) # Foreign Key indexes referenced_in :post, :inverse_of => :comments, :index => true
- 21. Using Mongoid Everyday Mongoid Integrations
- 22. Document Limit
- 23. 4 MB
- 25. Testing
- 26. RSpec Integration # in spec/spec_helper.rb RSpec.configure do |config| config.mock_with :rspec config.before :each do Mongoid.master.collections.select {|c| c.name !~ / system/ }.each(&:drop) end end
- 28. Use Remarkable # in spec/spec_helper.rb require 'remarkable/active_model' require 'remarkable/mongoid'
- 29. Mongoid Matchers have_field reference_one reference_many be_referenced_in embed_one embed_many be_embedded_in validate_uniqueness_of validate_association All ActiveModel validations from Remarkable::ActiveModel
- 30. Cucumber Integration # features/support/hooks.rb Before do |scenario| Mongoid.master.collections.select {|c| c.name !~ /system/ }.each (&:drop) end
- 31. Factory Girl
- 32. Works out of the box FactoryGirl.define do factory :post do title 'My first blog post' author 'Kevin Faustino' content 'Hello World' end end
- 33. Factories with Cucumber # features/support/env.rb require 'factory_girl' require 'factory_girl/step_definitions'
- 34. Monkey Patched Step Definition # features/step_definitions/mongoid_steps.rb Given /^an? (.+) exists with an? (.+) of "([^"]*)"$/ do |model, field, value| factory_name = model.gsub(' ', '_') Factory factory_name, field => value end
- 35. Example Feature Usage Given the following posts exist: | title | excerpt | | 10 greatest Batman Villians | We countdown ... | | The Death of Batman | Batman falls ... |
- 36. Caching in Rails
- 37. Create a Cache-Key module Cacheable def cache_key if new_record? "#{collection_name}/#{id}/new" elsif respond_to?(:updated_at) "#{collection_name}/#{id}-#{updated_at.to_i}" else "#{collection_name}/#{id}" end end end
- 38. Safe Operations
- 39. post = Post.safely(:w => 2).create( :title => 'We will receive verification' ) post.safely(:w => 2).destroy
- 40. Safely Options :w - A client can block until a write operation has been replicated to N servers :fsync - force the database to fsync all files before returning
- 41. Enslave
- 42. Query from your Slaves # Query specific Post.where(:title => 'Toronto Ruby').enslave # Document specific class Post include Mongoid::Document enslave end
- 43. Dropping Down
- 44. When you need more performance, drop down to the driver
- 45. collection = mongo-ruby-driver # Add a post id only if it does not already exist on # the set collection.update({'_id' => id}, {'$addToSet' => {'post_ids' => post.id}})
- 46. Using Mongoid Everyday Mongoid Integrations
- 47. Full Text-Search
- 48. Use Solr @solr = RSolr.connect :url => "http://127.0.0.1:8983/solr" @solr.add( { :id => post.id, :text => post.content, :published_on => post.published_on.strftime("%Y-%m-%dT%H:%M: 00Z") }, { :add_attributes => { :commitWithin => 10000 } })
- 49. Photo Uploads
- 50. Not with paperclip! X
- 52. Agnostic
- 53. Document Example class Post include Mongoid::Document include Mongoid::Timestamps field :title field :author field :content field :slug referenced_in :blog mount_uploader :featured_image, ImageUploader end
- 54. Authentication
- 55. Use Devise class User include Mongoid::Document devise :database_authenticatable, :rememberable, :trackable, :validatable end
- 56. Coming Soon
- 57. Many to Many support without dropping down to the driver
- 58. Thank you!