Ruby on Rails Ruby on Rails Action Mailer, Background Jobs & Caching 3

Question 1

Which method is used for low-level caching to read or compute-and-store arbitrary data in Rails?

Accepted Answer

Rails.cache.fetch

Answer

Rails.cache.store

Answer

ApplicationCache.read

Answer

cache_store.get_or_set

Question 2

What is the default cache store in a Rails application without any explicit cache configuration?

Accepted Answer

:memory_store

Answer

:file_store

Answer

:null_store

Answer

:mem_cache_store

Question 3

Which Rails view helper method is used to wrap content in a fragment cache block?

Accepted Answer

cache do

Answer

fragment_cache do

Answer

cached do

Answer

cache_block do

Question 4

Which cache store is recommended when multiple Rails application servers need to share a single cache?

Accepted Answer

:redis_cache_store

Answer

:memory_store

Answer

:file_store

Answer

:null_store

Question 5

What is 'Russian Doll caching' in the context of Rails view caching?

Accepted Answer

Nesting cache blocks where outer caches wrap inner cached fragments

Answer

Using multiple cache backends simultaneously for redundancy

Answer

Encrypting cache entries using multiple sequential keys

Answer

Sharding cache data across multiple Redis cluster nodes

Question 6

What Rails command enables or disables caching in the development environment?

Accepted Answer

rails dev:cache

Answer

rails cache:toggle

Answer

rails enable:caching

Answer

rails config:cache

Question 7

What information does cache_key_with_version return for an ActiveRecord model instance?

Accepted Answer

A string combining the model name, record ID, and updated_at timestamp

Answer

The MD5 hash of all the model's serialized attributes

Answer

The database table name and the record's primary key only

Answer

A UUID generated at the time the cache entry is written