CODEWITHSUNDEEP
ruby-on-railscaching
fguillen
fguillen

Reputation: 38812

Rails.cache how to make increment and expiration at the same time

I see that Redis doesn't allow make an increment and an expiration at the same time. I solved this doing it in 2 steps:

my_redis_client.incrby( key, amount )
my_redis_client.expire( key, expire_time )

But if I want to use Rails.cache I don't know how to obtain the same result in the most optimal way.

If I do this:

Rails.cache.increment( key, amount, :expires_in => expire_time )

The expires_in is completely ignored.

Is there any way to set an expiration time and execute an increment using Rails.cache?

Upvotes: 3

Views: 2816

Answers (3)

fguillen
fguillen

Reputation: 38812

This is what worked for me in Rails 5.2

Rails.cache.write(key, 0, :raw => true, :unless_exist => true, :expires_in => expire_time)
Rails.cache.increment( key, amount )

Upvotes: 2

fguillen
fguillen

Reputation: 38812

Looks like in Rails 6.0.0 the:

Rails.cache.increment( key, amount, :expires_in => expire_time )

works as expected:

Upvotes: 3

kasperite
kasperite

Reputation: 2478

One option is to monkeypatch Rails.cache ie

module CacheSupport
  def increment_with_ttl(key, amount, ttl)
    increment(key, amount)
    expire(key, ttl)
  end
end

Rails.cache.extend(CacheSupport)

Put this in initializer folder then you can start using Rails.cache.increment_with_ttl() in your project

Upvotes: 1

Related Questions