Rails - Nov 2007 - Single Table Inheritance

Hi, a (hopefully) quick STE question.

I am loading a bunch of surveys of various types from csv files.  The two
relevant classes for this question:

#  A wrapper around the loaded surveys
class Load < ActiveRecord::Base
  require "fastercsv"
  include FileLoader

  # Base survey relationship
  has_many :surveys

  # Child relationships
  has_one :head_survey
  has_one :president_survey
  has_many :faculty_surveys
  # etc etc
end

# Base survey class
class Survey < ActiveRecord::Base
  has_one :load
  has_many :survey_responses

  #factory method to generate the type of survery
  def self.factory(type, params)
    case type
      when ''pres''
        return Board_President_Survey.new(params)
      when ''membr''
        return Board_Member_Survey.new(params)
      when ''busnss''
        return Business_Survey.new(params)
      when ''faclty''
        return Faculty_Survey.new(params)
      when ''dev''
        return Development_Survey.new(params)
      when ''head''
        return Head_Survey.new(params)
      else
        return nil
    end
  end
end


So a Load has many Surveys, but there are several survey types.   Three of
the Survey types are singletons (only one survey per Load) and the other
types are has_many''s.

I have a collection of surveys already instantiated:
load.surveys

If I call:
load.head_survey

Will this reference the head_survey from the existing collection, or will it
perform another find?

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