#238 Mongoid (revised)

Jul 28, 2012 | 9 minutes | Plugins, Models

Mongoid is a Ruby gem for interacting with MongoDB. Here I show the basics of setting up an app, querying for records, adding embedded associations, overriding the id, and more.

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          Gemfile
        
gem 'mongoid', '~> 3.0.2'

          terminal
        
rails g mongoid:config
rails g scaffold product name price:big_decimal
rails g model review content

          rails console
        
Product.where(:price.lte => 40).first
Product.lte(price: 40).first
Product.lte(price: 40).gt(released_at: 1.month.ago)
Product.lte(price: 40).gt(released_at: 1.month.ago).asc(:name)

p = Product.first
p.reviews.create! content: "great game!"
p.reviews.size
Review.count

p = Product.first
p.destroy
Product.count
p.restore

          models/product.rb
        
class Product
  include Mongoid::Document
  include Mongoid::Timestamps
  include Mongoid::Paranoia
  include Mongoid::Versioning
  
  field :name, type: String
  field :price, type: BigDecimal
  field :released_on, type: Date
  field :_id, type: String, default: ->{ name.to_s.parameterize }
  
  attr_accessible :name, :price, :released_on
  
  validates_presence_of :name
  
  embeds_many :reviews
end

          models/review.rb
        
class Review
  include Mongoid::Document
  field :content, type: String
  
  embedded_in :product
end