Whats the best way to cache a value daily in rails?
I have a database call that is accessible by an API and I want to make and store it on a daily basis.
What's the best way/practice to do this?
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Loot at [Rails Cache Fetch method](http://api.rubyonrails.org/classes/ActiveSupport/Cache/Store.html#method-i-fetch) with `expires_in` options. – Florent Ferry May 07 '15 at 20:19
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http://stackoverflow.com/a/30105641/2697183 – AbM May 07 '15 at 20:21
2 Answers
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Let's say you have a widget_price that you only want to update every 24 hours. Normally you use Widget.calculate_daily_price to get the daily price, but it takes too long to run slowing down your web pages.
widget_price = Widget.calculate_daily_price
Wrap that call with a Rails.cache.fetch and expire the results in 24 hours.
widget_price = Rails.cache.fetch('widget_price', expires_in: 24.hours) do
Widget.calculate_daily_price
end
Now, if the widget_price is already cached that cached value will be used and the block will be ignored. If the cache has expired when this is run, the block will be executed and the cache set to the new value for another 24 hours.
infused
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1If it is a heavy query, then you'll probably want to also set the `race_condition_ttl` to avoid the dog pile effect. https://guides.rubyonrails.org/caching_with_rails.html#activesupport-cache-store – allen Jun 23 '21 at 14:29
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I've another solution with https://github.com/igorkasyanchuk/rails_cached_method
You can simply change your code to Widget.cached.calculate_daily_price
and even specify expires_in: 24.hours if needed
Igor Kasyanchuk
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