For browser cache purpose, asset_helper help us to add a timestamp (integer) after image, javascript and css files (http://www.example.com/image.jpg?123456), but which seems doesn't working properly in my production server.
I am not sure if I am correct, it check the file last modify time to generate the integer. Our problem is, we use attachment_fu to upload photo, and we added a feature to rotate the photo. I checked the photo in file system(linux), and the database filed (updated_at), both updated after the photo is rotated, but the timestamp in the url of the image does not update......
We use mongrel cluster and deploy using capistrano. We haven't override any function about asset_helper.
Any idea?
Thanks.