Hey Zahir and Naveed.

The keys of the engines hash needs to be one of the support D2 engines (session, logger, serializer, template).

i.e. that sample config should be:

engines:
  serializer:
    JSON:
      convert_blessed: 1

I'm sure that structure was documented.. if its not (or its too hard to find) feel free to raise an issue in the github repo. Documentation patches are always more than welcome!

Hope that helps,
  Russell (veryrusty) Jenkins.

On 30/03/2015 5:19 pm, Naveed Massjouni wrote:
Just update your config.yml like so:

    engines:
      JSON:
        convert_blessed: 1

-Naveed Massjouni