# File lib/dm-core/collection.rb, line 250
    def last(*args)
      last_arg = args.last

      limit      = args.first if args.first.kind_of?(Integer)
      with_query = last_arg.respond_to?(:merge) && !last_arg.blank?

      query = with_query ? last_arg : {}
      query = self.query.slice(0, limit || 1).update(query).reverse!

      # tell the Query to prepend each result from the adapter
      query.update(:add_reversed => !query.add_reversed?)

      # TODO: when a query provided, and there are enough elements in tail to
      # satisfy the query.limit, filter the tail with the query, and make
      # sure it matches the limit exactly.  if so, use that result instead
      # of calling all()

      collection = if !with_query && (loaded? || lazy_possible?(tail, query.limit))
        new_collection(query, super(query.limit))
      else
        all(query)
      end

      if limit
        collection
      else
        collection.to_a.last
      end
    end