26 lines
757 B
Ruby
26 lines
757 B
Ruby
class ConflictCoefficient
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attr_reader :left, :right, :conflicts
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def self.all
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talk_combinations = Talk.find(:all, from: :halfnarp_friendly).map(&:id).combination(2)
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talk_preferences = TalkPreference.this_years
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talk_preferences_count = talk_preferences.count
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talk_combinations.map do |talks|
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conflicts = talk_preferences.select do |talk_preference|
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talk_preference.include_all? talks
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end.count
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ConflictCoefficient.new talks.first, talks.last, conflicts, talk_preferences_count
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end
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end
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def initialize(left, right, conflicts, total_votes)
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@left, @right, @conflicts, @total_votes = left, right, conflicts, total_votes
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end
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def per_cent
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Rational(100 * @conflicts, @total_votes).to_f
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end
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end
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