Rails: how to save up database queries using cache

generic_cacher.rb

class GenericCacher
  attr_reader :cache_store

  def initialize
    @cache_store = ActiveSupport::Cache::FileStore.new(“#{Rails.root}# {location}”)
  end

  def write
    cache_store.write(cache_key_env_based, subject)
  end

  def fetch
    cache_store.fetch(cache_key_env_based) do
      subject
    end
  end

 def delete
   cache_store.delete(cache_key_env_based)
 end

 private
   def cache_key
     raise NotImplementedError
   end

   def cache_key_env_based
     “#{cache_key}_#{Rails.env}”
   end

   def subject
     raise NotImplementedError
   end

   def location
     raise NotImplementedError
   end
end