Move digest path calculation out of loop

On every iteration of generating a cache for a collection a “digest path” is calculated even though it’s exactly the same for every element.

This PR exposes a method `digest_path_from_virtual` that returns back a “digest_path”. This can in turn be passed back into `cache_fragment_name`. This not only does less work, but it also (you guessed it) uses  less memory.

before: Total allocated: 762539 bytes (7035 objects)
after: Total allocated: 743590 bytes (6621 objects) 


(762539 - 743590)/ 762539.0 # => 2.4% faster ⚡️⚡️

0 files changed, 0 insertions, 0 deletions