activerecord-alt-mongo-adapter

= ActiveTokyoCabinet

Copyright (c) 2010 SUGAWARA Genki [e-mail]

== Description

activerecord-alt-mongo-adapter is a MongoDB adapter for ActiveRecord.

activerecord-alt-mongo-adapter on MongoDB Ruby Driver.

see http://www.mongodb.org/display/DOCS/Home , http://api.mongodb.org/ruby/0.18.3/index.html

== Project Page

http://rubyforge.org/projects/araltmongo/

== Install

gem install activerecord-alt-mongo-adapter

== Example === database.yml

development:
  adapter:  mongo,
  host:     localhost
  port:     27017
  database: scott

=== Model

class Emp < ActiveRecord::Base
  include ActiveMongo::Collection
  # There is no need to define a schema.
end

=== ActiveRecord API

# see http://api.rubyonrails.org/classes/ActiveRecord/Base.html

emp = Emp.find(:first, 
        :conditions => ["job = ? and sal >= ?", "MANAGER", 2800],
        :order => 'sal desc', :limit => 3, :offset => 1)

p emp.id #=> "4bb795e8f15d3d0324000006"
emp.age = 30
emp.save

emp_list = Emp.find(:all, :conditions => {:empno => [7654, 7698, 7782]})

emp_list.each do |i|
  i.destroy if i.sal < 2000
end

new_emp = Emp.new
new_emp.empno = 8000
new_emp.ename = 'YAMADA'
new_emp.age   = 27
new_emp.save!

# not available:
# - :include, :group
# - `OR'
# - Include `ID' in search condition
# http://araltmongo.rubyforge.org/svn/trunk/lib/active_mongo/sqlparser.y

=== Expanded operator

# see http://www.mongodb.org/display/DOCS/Advanced+Queries

emp = Emp.find(:all, :conditions => ['job regexp ?', 'LE'])

emp = Emp.find(:all, :conditions => ['empno mod ?', [2, 0]])

emp = Emp.find(:all, :conditions => ['foo exists ?', true])

=== Low layer API

coll = Emp.collection

m =<<-EOS
  function() {
    emit(this.job, 1);
  }
EOS

r =<<-EOS
  function(k, vals) {
    var sum = 0;

    for(var i in vals) {
      sum += vals[i];
    }

    return sum;
  }
EOS

coll.map_reduce(m, r).find.each do |i|
  # do anything
end