def as_json_cached(options = {})
      keys, json = as_json_partial(options)
      Mongoid::CachedJson.materialize_json_references_with_read_multi(keys, json)
    end
def as_json_cached(options = {})
      keys, json = as_json_partial(options)
      Mongoid::CachedJson.materialize_json_references_with_read_multi(keys, json)
    end
Fetch the partial JSON and materialize all JSON references.