⚡ Add index to items slug and cache some queries

app/actions/items/list_genres.rb

@@ -5,7 +5,9 @@ class ListGenres < Actor
     output :genres, type: Array
 
     def call
-      self.genres = Item.pluck(:genres).flatten.uniq.sort
+      self.genres = Rails.cache.fetch('cache-genres', expires_in: 8.hours) do
+        Item.pluck(:genres).flatten.uniq.sort
+      end
     end
   end
 end

app/actions/items/list_languages.rb

@@ -5,7 +5,9 @@ class ListLanguages < Actor
     output :languages, type: Array
 
     def call
-      self.languages = Item.pluck(:languages).flatten.uniq.compact.sort
+      self.languages = Rails.cache.fetch('cache-languages', expires_in: 8.hours) do
+        Item.pluck(:languages).flatten.uniq.compact.sort
+      end
     end
   end
 end

config/environments/development.rb

@@ -25,7 +25,7 @@
     config.action_controller.perform_caching = true
     config.action_controller.enable_fragment_cache_logging = true
 
-    config.cache_store = :memory_store
+    config.cache_store = :file_store, Rails.root.join('tmp/cache')
     config.public_file_server.headers = {
       'Cache-Control' => "public, max-age=#{2.days.to_i}"
     }

config/environments/production.rb

@@ -59,7 +59,7 @@
   config.log_tags = [:request_id]
 
   # Use a different cache store in production.
-  # config.cache_store = :mem_cache_store
+  config.cache_store = :file_store, Rails.root.join('tmp/cache')
 
   # Use a real queuing backend for Active Job (and separate queues per environment).
   # config.active_job.queue_adapter     = :resque

config/initializers/sentry.rb

@@ -8,6 +8,6 @@
     # Set tracesSampleRate to 1.0 to capture 100%
     # of transactions for performance monitoring.
     # We recommend adjusting this value in production
-    config.traces_sample_rate = 0.5
+    config.traces_sample_rate = 0.2
   end
 end

db/migrate/20220214140037_add_index_to_items_slug.rb

@@ -0,0 +1,5 @@
+class AddIndexToItemsSlug < ActiveRecord::Migration[7.0]
+  def change
+    add_index :items, :slug
+  end
+end