Rails cache

Rails is known for its lack of performance, but one of the biggest bottle neck with any framework is database access.

I love active record, but it can be slow. One thing you can do to improve some queries is add a cache layer. This will skip the database and pull the data from redis or memcached. (depends which one you setup as.) I am using Redis, but use it for more than a cache layer. It good for delayed jobs, or store values that need to be accessed later.

Here is a simple example of using rails cache:

@products =  Rails.cache.fetch('products', expires_in: 1.day) do
  Product.all
end

I personally recommend always using expires_in, because you do not want stale data.

If for some reason you need to clear the chace layer, simply run the following command:

Rails.cache.delete('products')