require 'fastercsv' class Map < ActiveRecord::Base def self.from_city_name(city_name) self.find_or_initialize_by_name(city_name).save! end def self.pair second = nil max_tries = self.count tries = 0 while second.nil? && tries < max_tries first = self.all(:order => 'RANDOM()', :limit => 1).first second = self.all(:order => 'RANDOM()', :limit => 1, :conditions => [%{ ( points >= :first_points AND id <> :first_id ) OR ( id NOT IN ( SELECT map_a_id FROM mashes WHERE map_b_id = :first_id ) AND id NOT IN ( SELECT map_b_id FROM mashes WHERE map_a_id = :first_id ) )}, { :first_id => first.id, :first_points => first.points } ] ).first tries += 1 end if second.nil? logger.error('OH CRAP thar be no more pairings for ye olde mashes') [first, first] else [first, second] end end def self.import(csv_filename) FasterCSV.parse(open(csv_filename), :headers => true, :header_converters => [:downcase, :symbol]).each do |row| map = self.find_or_initialize_by_name("#{row[:city]}, #{row[:region]}") map.save if block_given? yield map end end end def self.mashes Mash.all(:conditions => ['map_a = :id OR map_b = :id', {:id => self.id}]) end def rounds Mash.count(:conditions => ['map_a = :id OR map_b = :id', {:id => self.id}]) end end