influence_model.rb

MongoMapper.connection = Mongo::Connection.new('localhost')
MongoMapper.database = 'solrtest'
class User
  include MongoMapper::Document
  has_many :lists

  key :twit_id,           Integer, :index => true, :unique => true
  key :screen_name,       String
  key :name,              String
  key :location,          String
  key :description,       String
  key :url,               String
  
  key :followers_count,   Integer
  key :friends_count,     Integer
  
  key :listed_on,         Array
  key :listed_on_count,   Integer, :default => 0
  
  def self.push_listed_on(twit_id, list)
    push_fields = {'listed_on' => {list.name => list.subscriber_count}}
    
    collection.update({
        :twit_id => twit_id
      }, '$push' => push_fields, '$inc' => {:listed_on_count => 1}) 
  end
end

class List
  include MongoMapper::Document
  belongs_to :user
    key :user_id, ObjectId
  
  key :twitlist_id,       Integer, :index => true, :unique => true  
  key :name,              String
  key :subscriber_count,  Integer, :default => 1
  
  key :member_count, Integer
  key :description, String
end