DAODALUS

Construct complex MongoDB queries, updates and aggregations.

Configuration:

# config/mongo.yml
development:
  animals:
    database: animals_development
    host: localhost
    pool_size: 5
    timeout: 5
    replicate_set_name: animals_development
    servers:
      - { host: localhost, port: 27017 }

Initialisation:

# config/initializers/daodalus.rb
Daodalus::Configuration.load('config/mongo.yml', Rails.env)

Examples:

#!ruby
class CatDAO
  extend Daodalus::DAO # or `include` if you want an instance of a DAO
  target :animals, :cats # or overide `connection` to supply your own

  def self.example_find
    select(:name).where(:paws).less_than(4).find
  end

  def self.example_find_one
    where(:collar_id).eq("aochc986").find_one
  end

  def self.example_update
    set(:stray, true).where(:address).does_not_exist.update
  end

  def self.example_find_and_modify
    dec(:lives).
      push(:names, "Kitty").
      where(:stray).eq(true).
      and(:cuteness).gt(8).
      find_and_modify(new: true)
  end

  def self.example_remove
    where(:lives).eq(0).remove
  end

  def self.example_aggregation
    match(:lives).gt(3).
      and(:address).exists.
      unwind(:favourite_foods).
      group(:favourite_foods).
      min(min_paws: 'paws').
      sort(:_id).
      limit(10).
      project(:_id).as(:food).and(:min_paws).
      aggregate
  end
end

License

Daodalus is Copyright © 2012 On The Beach Ltd. It is free software, and may be redistributed under the terms specified in the LICENSE file.