Module: Acts::Elo::InstanceMethods

Defined in:
lib/acts_as_elo/acts/elo.rb

Instance Method Summary collapse

Instance Method Details

#elo_draw!(opponent, opts = {}) ⇒ Object 



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# File 'lib/acts_as_elo/acts/elo.rb', line 64

def elo_draw!(opponent, opts={})
  elo_update(opponent, opts.merge!(:result => :draw))
end

#elo_lose!(opponent, opts = {}) ⇒ Object 



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# File 'lib/acts_as_elo/acts/elo.rb', line 60

def elo_lose!(opponent, opts={})
  elo_update(opponent, opts.merge!(:result => :lose))
end

#elo_update(opponent, opts = {}) ⇒ Object 



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# File 'lib/acts_as_elo/acts/elo.rb', line 68

def elo_update(opponent, opts={})
  begin
    if self.class.respond_to?(:acts_as_elo_options) && self.class.acts_as_elo_options[:one_way]
      one_way = true
    end
    one_way   ||= opts[:one_way]
    send_opts = {one_way: true}

    # Formula from: http://en.wikipedia.org/wiki/Elo_rating_system
    diff        = opponent.elo_rank.to_f - elo_rank.to_f
    expected    = 1 / (1 + 10 ** (diff / 400))
    coefficient = elo_proficiency_map[:coefficients][1]

    if elo_rank < elo_proficiency_map[:rank_limits].first
      coefficient = elo_proficiency_map[:coefficients].first
    end

    if elo_rank > elo_proficiency_map[:rank_limits].last
      coefficient = elo_proficiency_map[:coefficients].last
    end

    if opts[:result] == :win
      points = 1
      send_opts.merge!(result: :lose)
    elsif opts[:result] == :lose
      points = 0
      send_opts.merge!(result: :win)
    elsif opts[:result] == :draw
      points = 0.5
      send_opts.merge!(result: :draw)
    end

    opponent.elo_update(self, send_opts) unless one_way

    self.elo_rank = (elo_rank + coefficient*(points-expected)).round
  rescue Exception => e
    puts "Exception: #{e.message}"
  end
end

#elo_win!(opponent, opts = {}) ⇒ Object 



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# File 'lib/acts_as_elo/acts/elo.rb', line 56

def elo_win!(opponent, opts={})
  elo_update(opponent, opts.merge!(:result => :win))
end