Rails cache read_multi using array of keys

I am currently trying to get my key value pair out of redis using this function:

Rails.cache.read_multi("asdf:1", "asdf:2")

It works smoothly in the example above, but when I try to get it working with an array of values it returns nil.

keys = ids.map {|id| "asdf:#{id}"}Rails.cache.read_multi(keys)

Anyone has an idea how I get this working?