From: Chris Olsen <olsen.chris@...>
Date: 2008-07-16T12:38:09+09:00
Subject: Is there a way to call include for an object instance?

I need to be able to create an object and, based on the param that I
pass in on the class create_for_sport method, create an object with the
proper module included.

It can be seen at the bottom by the comments I made that the includes
are being added on to the Stats class and the methods from the first
include are still there after the second include.  Is there a way to add
an include to an object instance rather than a class?

Thanks for the help

########
module SoftballStats
  def to_sport
    puts "softball"
  end

  def batting_average
    0.563
  end

  def before_save
    puts "in the softball before save"
  end

end

module HockeyStats
  def to_sport
    puts "hockey"
  end

  def scoring_percentage
    0.34
  end

  def before_save
    puts "in the hockey before save"
  end

end

class Stats

  def self.create_by_sport(sport)
    s = Stats.new
    s.sport = sport
    return s
  end

  def sport=(sport)
    Stats.instance_eval do  # have tried to use self.instance_eval
      eval("include #{sport.capitalize}Stats")
    end
  end

end

s = Stats.create_by_sport("softball")
puts s.batting_average  # 0.563

h = Stats.create_by_sport("hockey")
puts h.scoring_percentage  # 0.34
puts h.batting_average  # 0.563  -> still has this method

s.before_save  # "in the hockey save"  -> softball before_save is now
overridden
h.before_save  # "in the hockey save"
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