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45 lines
1.2 KiB
45 lines
1.2 KiB
1 year ago
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require_relative "rank_king/web"
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require_relative "rank_king/models"
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require_relative "rank_king/open_skill"
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module RankKing
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OS = OpenSkill.new
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Match = Data.define(:a, :b)
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def self.find_match(axis:)
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items = axis.pool.items
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items.combination(2).sort_by {|combo|
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ratings = combo.map {|item| os_rating(axis:, item:) }
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Math.sqrt(
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[ratings, ratings.reverse]
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.map {|game| [game, OS.rate(game.map {[_1]}).flatten] }
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.sum {|pre,post| pre.zip(post).sum { (_1.sigma - _2.sigma)**2 }}
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)
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}.last
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end
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def self.rank(axis:, winner:, loser:)
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fail unless [winner, loser].all? { _1.pool == axis.pool }
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game = [winner, loser].map { os_rating(axis:, item: _1) }
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result = OS.rate(game.map { [_1] }).flatten
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DB.transaction do
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Ranking.create(axis:, winner:, loser:)
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Rating.update_or_create({axis:, item: winner}, result.fetch(0).to_h)
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Rating.update_or_create({axis:, item: loser}, result.fetch(1).to_h)
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end
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end
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private
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def self.os_rating(**filter)
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if result = Rating.where(**filter).first
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OS.rating(mu: result.mu, sigma: result.sigma)
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else
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OS.rating
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end
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end
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end
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