# File lib/mongo/db.rb, line 420
    def rename_collection(from, to)
      oh = BSON::OrderedHash.new
      oh[:renameCollection] = "#{@name}.#{from}"
      oh[:to] = "#{@name}.#{to}"
      doc = DB.new('admin', @connection).command(oh, :check_response => false)
      ok?(doc) || raise(MongoDBError, "Error renaming collection: #{doc.inspect}")
    end