issue-139.rb

require 'mongoid'
require 'rspec'

Mongoid.configure do |config|
  config.master = Mongo::Connection.new.db('testing')
  config.autocreate_indexes = true
end

class User
  include Mongoid::Document
  field :latlng, :type => Array

  collection.remove
  index [[:latlng, Mongo::GEO2D]]
end

context "geo queries" do
  let!(:closest) { User.create(:latlng => [50, 50]) }
  let!(:middle) { User.create(:latlng => [55, 55]) }
  let!(:farthest) { User.create(:latlng => [60, 60]) }

  after { User.delete_all }

  context "$center" do
    subject { User.where(:latlng.within => {"$center" => [[50, 50], 10]}).entries }

    it "should filted users outside the radius" do
      subject.size.should == 2
    end

    it "should return in order of distance" do
      subject[0].should == closest
      subject[1].should == middle
    end
  end

  context "dbNear" do
    let(:query) do
      BSON::OrderedHash.new.tap do |query|
        query["geoNear"] = "users"
        query["near"] = [50, 50]  # lat / long
        query["num"] = 2          # max results
      end
    end

    subject { User.collection.db.command(query) }

    it "should filter users outside the center and max size" do
      subject["results"].size.should == 2
    end

    it "should return in order of distance" do
      subject["results"][0]["obj"]["_id"].should == closest.id
      subject["results"][1]["obj"]["_id"].should == middle.id
    end

    it "should include the distance" do
      subject["results"][0]["dis"].should == 0
      subject["results"][1]["dis"].should be_close(7, 1)
    end

    it "should be convertible into mongoid documents" do
      subject["results"].map do |result|
        Mongoid::Factory.build(User, result["obj"])
      end.should == [closest, middle]
    end
  end

end