Disable rails class_caching mechanism for Time.now?

I'm currently fighting with the rails class_caching mechanism as I need to return a file path that changes discrete over time. It is used to constantly change a log file path after the amount of GRAIN seconds and returns a fully working timestamp:

GRAIN = 30

def self.file_path  
   timestamp = (Time.now.to_i / GRAIN) * GRAIN
   return FILE_DIR + "tracking_#{timestamp.call}.csv"  
end

This works really great if the class_caching of rails is set to false. But of course the app is to run with enabled class caching. And as soon as I enable it, either the timestamp variable is cached or the Time.now expression.

I tried to solve this with a proc block, but no success:

def self.file_path
    timestamp = Proc.new { (Time.now.to_i / GRAIN) * GRAIN }
    return FILE_D开发者_JS百科IR + "tracking_#{timestamp.call}.csv"
end

Is there anything like a cache disabled scope I could use or something like skip_class_caching :file_path? Or any other solutions?

Thank you for your help!

It's not entirely clear where your code is located, but ActiveRecord has an uncached method that suspends the cache for whatever is inside its block.

I found the problem. Not the Time.now was beeing cached but a logger instance. It was assigned in another method calling the file_path.

As long as the class caching was disabled the environment forgot about the class variable between the requests. But as soon as it was enabled the class variable stayed the same - and desired value - but never changed.

So I had to add a simple condition that checks if the file_path changed since the last request. If so, the class variable is reassigned, otherwise it keeps the same desired value.

I changed from:

def self.tracker
    file_path = Tracking.file_path
    @@my_tracker ||= Logger.new(file_path)
end

to:

def self.tracker
    file_path = Tracking.file_path
    @@my_tracker = Logger.new(file_path) if @@my_tracker.nil? or Tracking.shift_log?(file_path)
    @@my_tracker
end

Thank you for your help anyways!