method

write

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What's this?

write(key, value, options = nil) public

Writes a value to the cache.

Possible options:

:unless_exist - set to true if you don’t want to update the cache if the key is already set.
:expires_in - the number of seconds that this value may stay in the cache. See ActiveSupport::Cache::Store#write for an example.

Show source

# File activesupport/lib/active_support/cache/mem_cache_store.rb, line 76
      def write(key, value, options = nil)
        super
        method = options && options[:unless_exist] ? :add : :set
        # memcache-client will break the connection if you send it an integer
        # in raw mode, so we convert it to a string to be sure it continues working.
        value = value.to_s if raw?(options)
        response = @data.send(method, key, value, expires_in(options), raw?(options))
        response == Response::STORED
      rescue MemCache::MemCacheError => e
        logger.error("MemCacheError (#{e}): #{e.message}")
        false
      end

October 2, 2008

1 thank

Setting ttl

Use the expires_in option to set a TTL for the cached item.

Rails.cache.write("top_items", :expires_in => 5.minutes)

You can use this with the fetch method as well:

Rails.cache.fetch("top_items", :expires_in => 5.minutes) do
  # some very expensive calculations
end

Note: this only works with supporting cache stores, like the MemCacheStore

write

Related methods

Setting ttl