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MongoDB & Mongoid with Rails
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MongoDB & Mongoid with Rails

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Brown bag presentation on using MongoDB and Mongoid with Rails.

Brown bag presentation on using MongoDB and Mongoid with Rails.

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  • 1. MongoDB { name: “mongo”, type: “db” }
  • 2. “MongoDB is designed to be human-oriented. It reduces the burden of programming. It tries to push jobs back to machines. You can accomplish more tasks with less work, in smaller yet readable code.” - Banker
  • 3. built for speed document/collection oriented dynamic queries and indexes replication and failover
  • 4. websites from yesterday and today high volume traffic high scalability storage of objects and JSON
  • 5. caveats
  • 6. no transactions
  • 7. relationships
  • 8. MongoDB with Ruby because we all want ActiveRecord...
  • 9. mongo-ruby-driver mongomapper mongoid
  • 10. Spiff uses Mongoid class Post include Mongoid::Document field :title, :type => String field :body, :type => String end @posts = @db.collection('posts') @document = {:title => "MongoDB on Rails", :body => "Revelatory! Loved it!"} @posts.save(@document)
  • 11. Associations in Mongoid class Post include Mongoid::Document field :title, :type => String field :body, :type => String has_many :comments end class Comment include Mongoid::Document field :rant, :type => String belongs_to :post, :inverse_of => :comments end This creates an Embedded Document. @posts = @db.collection('posts') @document = {:title => "MongoDB on Rails", :body => "Revelatory! Loved it!", :comments => [{:rant => “I completely disagree”}] } @posts.save(@document)
  • 12. Keys, Validations, Timestamps & Hooks class Post include Mongoid::Document include Mongoid::Timestamps field :title, :type => String field :body, :type => String field :slug, :type => String has_many :comments has_key :title, :unique => true # “Audi IMS” becomes “audiims” validates_presence_of :title, :body validates_unqiueness_of :title before_save :set_slug def set_slug self.slug = “#{title.parameterize}-#{body[0..3]}” end end
  • 13. Versioning a Mongo Document class Post include Mongoid::Document include Mongoid::Timestamps include Mongoid::Versioning field :title, :type => String field :body, :type => String field :slug, :type => String has_many :comments has_key :title, :unique => true # “Audi IMS” becomes “audiims” validates_presence_of :title, :body validates_unqiueness_of :title before_save :set_slug def set_slug self.slug = “#{title.parameterize}-#{body[0..3]}” end end
  • 14. Access related items class Post include Mongoid::Document include Mongoid::Timestamps include Mongoid::Versioning field :title, :type => String field :body, :type => String field :slug, :type => String has_many :comments belongs_to_related :account has_many_related :sources ..... end database.yml meet database.mongo.yml
  • 15. But does it blend? Post.all(:conditions => { :title => “Rails 2.3” }) Post.find(:all, ...) Post.first(...) Post.find_or_create_by(:title => “Merb is dead”) Post.find_or_initialize_by(...) Associations: @post.comments.all
  • 16. fuck SQL! Criteria is the shit. Criteria#all - perform exact matches Post.criteria.all(:title => [ “Rails”, “2.3” ]) Criteria#find - match key/value Post.criteria.and(:created_at.gt => 2.months.ago) Criteria#exclude Post.criteria.exclude(:created_at => Date.today) Criteria#id - match document id Post.criteria.id(“4b2fe28ee2dc9b5f7b000029”) Criteria#in - match any of the values in an array Post.criteria.in(:title => [“Merb”, “Rails”, “Ruby”] Criteria#order_by Post.criteria.order_by([[:created_at, :desc], [:title, :asc] ]) Criteria also has #limit, #not_in, #only, #skip
  • 17. arithmetic, grouping & aggregation #max, #min, #sum, #aggregate, #group
  • 18. “But what about named scopes dude?!” -Gabe named_scope :active, criteria.where(:active => true) do def count size end end named_scope :inactive, :where => { :active => false } named_scope :frags_over, lambda { |count| { :where => { :frags.gt => count } } } named_scope :deaths_under, lambda { |count| criteria.where(:deaths.lt => count) }
  • 19. You can chain any of the Criteria API Post.in(:title => [“Rails”, “Ruby”]).where(:created_at.gt => 2.months.ago).skip(10) class Post include Mongoid::Document class << self def ruby_related criteria.in(:title => [“Ruby”, “Rails”]) end def in_last_two_months criteria.where(:created_at.gt => 2.months.ago)) end end end Post.ruby_related.in_last_two_months
  • 20. additional mongoid features Composite Keys Indexing Inheritance native MongoDB expressions