more details on this Gem.

[shamithc]

Could you please provide more details on this Gem.

Is it possible to Query on JSON datatype using ActiveRecord?

[michaelbn]

This gem is only for serialize hash to json and vice versa.
I wrote this gem for active record 3, active record 4 has native support for this.
My prototype was gem activerecord-postgres-hstore.
If you are using postgresql 9.3 (http://www.postgresql.org/docs/9.3/static/functions-json.html), you can do somethink like this Person.where("data -> 'foo' <> 'bar'")