block_cache

BlockCache

Simply, cache ruby block data in mongo.

usage:

class TwitterPoller
  include BlockCache
  
  def twitter_latest
    results = cache_overwrite_by request.path do 
      # your unreliable twitter call goes here...
    end  
    
    render :json => results.to_json
  end
end

To use wrap your flimsy external service call with this block and conditionally raise an error if failure occurs. Most gems will handle this for you but if the block raises, then previous value will be returned and no errors raised.