Matchups_array completely removed. I do not know why has_many matches

does not work in tournaments. The solution was to add a matches
method.

app/models/weight.rb

@@ -5,8 +5,7 @@ class Weight < ActiveRecord::Base
 	attr_accessor :pools
 
 	before_save do
-		self.tournament.matchups_array = nil
-		self.tournament.save
+		self.tournament.destroyAllMatches
 	end
 
 	def pools