CODEWITHSUNDEEP
ruby-on-railsrubycachinghashmemcached
brojsimpson
brojsimpson

Reputation: 135

How do you cache a hash in Rails?

I am using Rails 4.2.1 and memcached. I can't seem to cache a hash. How do I cache a hash? 

irb(main):039:0* 
irb(main):040:0* Rails.cache.fetch("development_test") do
irb(main):041:1* 'hi'
irb(main):042:1> end
Cache read: development_test
Cache fetch_hit: development_test
=> "hi"
irb(main):043:0> Rails.cache.fetch("development_test")
Cache read: development_test
=> "hi"
irb(main):044:0> Rails.cache.fetch("development_test") do
irb(main):045:1* {'x' => 3}
irb(main):046:1> end
Cache read: development_test
Cache fetch_hit: development_test
=> "hi"
irb(main):047:0> Rails.cache.fetch("development_test")
Cache read: development_test
=> "hi"
irb(main):048:0>

Upvotes: 2

Views: 4036

Answers (2)

HarlemSquirrel
HarlemSquirrel

Reputation: 10154

I was able to cache hashes as JSONs. 

def cached_hash
  JSON.parse(
    Rails.cache.fetch("development_test", expires_in: 1.minute) do
      {'x' => 3}.to_json
    end
  )
end

Upvotes: 0

William Wong Garay
William Wong Garay

Reputation: 1941

Check documentation: http://apidock.com/rails/ActiveSupport/Cache/Store/fetch

Fetches data from the cache, using the given key. If there is data in the cache with the given key, then that data is returned.

But you can use the option force with true:

Rails.cache.fetch("development_test", force: true) do
  {'x' => 3}
end

for rewrite the cache value

Upvotes: 5

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