问题
I have a rails app with a Location model, which has a rating, and a rating_count field. Now, I need to reset every Location's rating and rating_countattributes to 0 at a specific time everyday, lets say 12:00:00 UTC.
How would I accomplish this? I'm using the default sqlite3 databases.
回答1:
The best option is to use cron. You can find tons of documentation out there!Although if you are running a Rails app you should check out whenever a pretty neat gem for managing cron jobs for your app!
回答2:
The easiest thing is to write a rake task that does that job, and then use whatever scheduling system your host uses (cron).
An alternative is to use delayed_job which allows to push work to a background process. While delayed-job is not exactly suited for something like this, it is perfectably capable of doing this. If your rails process starts, you add a new job, to run at 12:00. And the running of the job reschedules the job.
The nice thing of delayed-job is that your code runs in the context of a rails-process, so you can use methods you already have. Also nice: jobs are stored in the database, so you can have an overview.
回答3:
If you're on a *nix box, write a script to do the updates (eg. in PHP, or Perl) and simply add it to crontab. Check out cron.
来源：https://stackoverflow.com/questions/7105797/rails-reset-a-model-attribute-at-specific-time-each-day