What are some examples of caching in Ruby?

What are some examples of caching in Ruby?

Caching in Ruby can be done using various techniques. For instance, you can use the built-in Rails.cache for caching data in Rails applications.

Can you give me a code example of using Rails.cache?

Sure! Here's a simple example:

Rails.cache.fetch('my_cache_key') do
  # Expensive operation
  User.find_by(id: 1)
end

This will cache the result of the User.find_by call.

What about caching in plain Ruby without Rails?

In plain Ruby, you can use the Hash class to implement a simple cache. For example:

cache = {}

def fetch_from_cache(key, cache)
  cache[key] ||= yield
end

fetch_from_cache(:user_1, cache) { User.find(1) }

Are there any gems for caching in Ruby?

Yes, there are several gems like Dalli for Memcached and Redis for caching in Ruby applications. They provide more advanced caching strategies.