Saturday, June 17, 2017
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.
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