在Rails中缓存“渲染json”而不进行页面缓存？

Question

I have a controller method like this, which renders an object as JSON.

def show
  respond_to do |format|
    format.json do
      render json: @my_object, serializer: MyCustomSerializer
    end
  end
end

Now the json generation takes at least 12 seconds, so I would like to cache this. I could use HTTP caching here (with a stale? check), but that would still require other clients (browsers) to hit the slow JSON rendering the very first time.

How can I cache this "render json" call?

Answer 1

Assuming you are using active model serializers, you can override serializable_hash on the serializer to return a cached version, using Rails.cache.fetch , for example:

def serializable_hash
  Rails.cache.fetch(my_cache_key) { super }
end

Replace my_cache_key with a cache key that will invalidate the cached JSON (probably something based on updated_at ).