Neo4j::Bolt::Connection#exec_cast with a block

connection.cr

      def exec_cast(query : String, parameters : Map, types : Tuple(*TYPES), &block) forall TYPES
        send Commands::Run, query, parameters
        send Commands::PullAll

        result = read_raw_result
        until result[1] != 0x71
          # First 3 bytes are Structure, Record, and List
          # TODO: If the RETURN clause in the query has more than 16 items,
          # this will break because the List byte marker and its size won't be
          # in a single byte. We'll need to detect this here.
          io = IO::Memory.new(result + 3)
          {% begin %}
            row = {
              {% for type in TYPES %}
                {{type.stringify.gsub(/\.class$/, "").id}}.from_bolt(io),
              {% end %}
            }

            yield row
          {% end %}

          result = read_raw_result
        end
      end

exec_cast.cr

connection.exec_cast(query, parameters, { User, Group }) do |(user, group)|
  user.should be_a User
  group.should be_a Group
end

results = Array({ User, Group }).new
connection.exec_cast(query, parameters, { User, Group }) do |row|
  results << row
end