create

# File activerecord/lib/active_record/associations/alias_tracker.rb, line 14
      def self.create(connection, table_joins)
        if table_joins.empty?
          empty connection
        else
          aliases = Hash.new { |h,k|
            h[k] = initial_count_for(connection, k, table_joins)
          }
          new connection, aliases
        end
      end