Correction: this referenced blog post is from 2012, not 2013
> On Jun 19, 2017, at 10:13 AM, Jason Fleetwood-Boldt <[email protected]> > wrote: > > > Not sure were you got all of this code from… were you following an example > somewhere? > > This appears to be way overcomplicated for your use case. > > The definitive and nearly ubiqutious method for simple object caching > (incidentally, the singular form is spelled "cache," as in a small hiding > place. The word comes from the French, not to be confused with cachet, which > also comes from French, and means "superior status" or "prestige") is from > the DHH post from 2013… > > https://signalvnoise.com/posts/3113-how-key-based-cache-expiration-works > <https://signalvnoise.com/posts/3113-how-key-based-cache-expiration-works> > > > Assuming your objects are ActiveResource objects, you automatically get > cache_key defined for you. > > All you need to do is wrap the expensive (processing/time-intensive) code in > the caching mechanism > > Rails.cache.fetch(@contact) > // serialize or render the response data > end > > > … that's it. As explained in DHH's post from 2013, cache_key on @contact > automatically includes the timestamp of when the record was last updated. > When you make a change to any field the update_at timestamp changes, and so > does the cache key, invalidating all caches associated with that cache key. > > All of the other code you have looks like you went down a caching rabbit hole > that is unnecessary. (But learning the internals of the Rails caching > mechanism is a good thing for your own edification!) > > -Jason > > > > >> On Jun 18, 2017, at 2:51 AM, Arup Rakshit <[email protected] >> <mailto:[email protected]>> wrote: >> >> I have the below code: >> >> class ContactsController < ApplicationController >> >> # .. >> >> def top_3 >> cache_identifiers = { contact_1: 1, contact_2: 2, contact_3: 3 } >> cache_keys = cache_identifiers.keys >> cached_keys_with_values = Rails.cache.read_multi(*cache_keys) >> uncached_keys = cache_keys.map { |key| key unless >> cached_keys_with_values.has_key?(key) }.compact >> uncached_ids = uncached_keys.map { |key| cache_identifiers[key] } >> uncached_contacts = Contact.where(id: uncached_ids).to_a >> >> uncached_keys.zip(uncached_contacts).each do |key, value| >> Rails.cache.write(key, value) >> end >> >> @contacts = cache_keys.map do |key| >> cached_keys_with_values[key] || uncached_contacts.shift >> end >> end >> end >> >> I am using memcached as cache store. Now my question is how can I invalidate >> the cache when say any of the attributes(name, email) of the contact record >> changes. >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Ruby on Rails: Talk" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected] >> <mailto:[email protected]>. >> To post to this group, send email to [email protected] >> <mailto:[email protected]>. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/rubyonrails-talk/13256849-6db8-47f9-97e8-c51688d54ba7%40googlegroups.com >> >> <https://groups.google.com/d/msgid/rubyonrails-talk/13256849-6db8-47f9-97e8-c51688d54ba7%40googlegroups.com?utm_medium=email&utm_source=footer>. >> For more options, visit https://groups.google.com/d/optout >> <https://groups.google.com/d/optout>. > > ---- > > Jason Fleetwood-Boldt > [email protected] <mailto:[email protected]> > http://www.jasonfleetwoodboldt.com/writing > <http://www.jasonfleetwoodboldt.com/writing> > > If you'd like to reply by encrypted email you can find my public key on > jasonfleetwoodboldt.com <http://jasonfleetwoodboldt.com/> (more about setting > GPG: https://gpgtools.org <https://gpgtools.org/>) > > > -- > You received this message because you are subscribed to the Google Groups > "Ruby on Rails: Talk" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected] > <mailto:[email protected]>. > To post to this group, send email to [email protected] > <mailto:[email protected]>. > To view this discussion on the web visit > https://groups.google.com/d/msgid/rubyonrails-talk/6BC11AD8-3FCA-418B-A0D5-9EBD3438CE5F%40datatravels.com > > <https://groups.google.com/d/msgid/rubyonrails-talk/6BC11AD8-3FCA-418B-A0D5-9EBD3438CE5F%40datatravels.com?utm_medium=email&utm_source=footer>. > For more options, visit https://groups.google.com/d/optout > <https://groups.google.com/d/optout>. ---- Jason Fleetwood-Boldt [email protected] http://www.jasonfleetwoodboldt.com/writing If you'd like to reply by encrypted email you can find my public key on jasonfleetwoodboldt.com <http://jasonfleetwoodboldt.com/> (more about setting GPG: https://gpgtools.org) -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/rubyonrails-talk/A3C02C70-58D6-4016-8BB2-42B414E8950F%40datatravels.com. For more options, visit https://groups.google.com/d/optout.
