Contents

require 'stubs.rb'
require 'rulebase.rb'

module FuzzyRealty
  class ExpertSystem
    def self.scores(listings, query)
      
      scores = []
      
      for listing in listings
        score = 0
        query.params.each do |param|
          #calculate score modifier of parameter using indexed method
          change = FuzzyRealty::METHODS[param.type].call(listing,param)
          # if score is bad and parameter is required then reduce it further
          change = (change < 0.70 and param.required) ? (change - 1) : change
          score += change * FuzzyRealty::WEIGHTS[param.type]
        end
        scores << {listing => score}
      end
      return scores
    end
  end

  # Have a table of ways to calculate the score modifier
  # --> i.e. price will allow cheaper, sqft will allow bigger, etc.
end

if __FILE__ == $0
  # Creating a library of stub models
  a = FuzzyRealty::Listing.new({:price => 112000, :sqft => 720, :location => 'A'})
  b = FuzzyRealty::Listing.new({:price => 142000, :sqft => 1420, :location => 'B'})
  # The user wants price around 110k and in location A, 
  p1 = FuzzyRealty::Parameter.new(false,:price,110000)
  p2 = FuzzyRealty::Parameter.new(true,:location, 'A')

  q = FuzzyRealty::Query.new([p1,p2])
  puts FuzzyRealty::ExpertSystem.scores([a,b],q).inspect
end

Version data entries

1 entries across 1 versions & 1 rubygems

Version	Path
rkneufeld-fuzzy-realty-0.1.0	lib/fuzzy_realty.rb