class JbuilderTemplate

def cache!(key=nil, options={})

end
json.extract! @person, :name, :age
json.cache! ['v1', @person], expires_in: 10.minutes do

Example:

method in `ActionView::Helpers::CacheHelper` and so can be used in the same way.
Caches the json constructed within the block passed. Has the same signature as the `cache` helper 
def cache!(key=nil, options={})
  if @context.controller.perform_caching
    value = _cache_fragment_for(key, options) do
      _scope { yield self }
    end
    merge! value
  else
    yield
  end
end