Longitude Latitude in Rails

gistfile1.rb

class Poi < ActiveRecord::Migration
  def self.up
    create_table :pois, :id => :poi_id do |t|
      t.column :longitude, :decimal, :precision => 10, :scale => 7
      t.column :latitude, :decimal, :precision => 10, :scale => 7
    end
  end
 
  def self.down
    drop_table :pois
  end
end