CODEWITHSUNDEEP
ruby-on-railsruby-on-rails-3caching
Mano
Mano

Reputation: 987

How to use Rails.cache.fetch from common method?

I am using rails cache in my application for caching Active Record queries. I used a common method for Rails.cache.fetch, but it doesn't fetch the key. Am I missing anything here?

author = cache_fetch("author_id:#{current_user.id}") do
  Author.find(current_user.id)
end

In my lib file:

cache_fetch(key)
  Rails.cache.fetch(key,expires_in: 30.minutes)
end

Upvotes: 0

Views: 1205

Answers (1)

Chris Heald
Chris Heald

Reputation: 62668

#fetch takes a block, which is executed and the return value of which is cached if the key was not found in the cache. You should be using:

cache_fetch(key, options = {}, &block)
  Rails.cache.fetch(key, options.reverse_merge(expires_in: 30.minutes), &block)
end

If you don't pass the block, then Rails won't know what to cache in the event of a miss, and thus won't have anything to return. The addition of the optional options key allows you to pass overrides to cache_fetch that will then get passed onto #fetch, while still providing for defaults.

Upvotes: 3

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