Ruby on Rails - fragment caching in ruby on rails- ruby on rails tutorial - rails guides - rails tutorial - ruby rails
Fragment caching
- Rails cache, provided by ActiveSupport, can be used to cache any serializable Ruby object across requests.
- To fetch a value from the cache for a given key, use cache.read:
Rails.cache.read('city')
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- Use cache.write to write a value to the cache:
Rails.cache.write('city', 'Duckburgh')
Rails.cache.read('city')
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Alternatively, use cache.fetch to read a value from the cache and optionally write a default if there is no value:
Rails.cache.fetch('user') do
User.where(:is_awesome => true)
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- The return value of the passed block will be assigned to the cache under the given key, and then returned.
- We can also specify a cache expiry:
Rails.cache.fetch('user', :expires_in => 30.minutes) do
User.where(:is_awesome => true)
end