# File lib/mongo/db.rb, line 340
    def get_last_error(opts={})
      cmd = BSON::OrderedHash.new
      cmd[:getlasterror] = 1
      cmd.merge!(opts)
      doc = command(cmd, :check_response => false)
      raise MongoDBError, "error retrieving last error: #{doc.inspect}" unless ok?(doc)
      doc
    end