From a21bcac9e156d8c40fe7c15c62ac71a901091cc5 Mon Sep 17 00:00:00 2001
From: Eugen Rochko <eugen@zeonfederated.com>
Date: Wed, 30 Nov 2016 15:57:56 +0100
Subject: [PATCH] Further abstract caching for includes

---
 app/controllers/application_controller.rb |  2 ++
 app/models/concerns/cacheable.rb          | 15 +++++++++++++++
 app/models/notification.rb                |  3 ++-
 app/models/status.rb                      |  4 +++-
 4 files changed, 22 insertions(+), 2 deletions(-)
 create mode 100644 app/models/concerns/cacheable.rb

diff --git a/app/controllers/application_controller.rb b/app/controllers/application_controller.rb
index 5243bc446..9722f86b5 100644
--- a/app/controllers/application_controller.rb
+++ b/app/controllers/application_controller.rb
@@ -59,6 +59,8 @@ class ApplicationController < ActionController::Base
   end
 
   def cache_collection(raw, klass)
+    return raw unless klass.respond_to?(:with_includes)
+
     uncached_ids           = []
     cached_keys_with_value = Rails.cache.read_multi(*raw.map(&:cache_key))
 
diff --git a/app/models/concerns/cacheable.rb b/app/models/concerns/cacheable.rb
new file mode 100644
index 000000000..cd0167048
--- /dev/null
+++ b/app/models/concerns/cacheable.rb
@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+module Cacheable
+  extend ActiveSupport::Concern
+
+  class_methods do
+    def cache_associated(*associations)
+      @cache_associated = associations
+    end
+  end
+
+  included do
+    scope :with_includes, -> { includes(@cache_associated) }
+  end
+end
diff --git a/app/models/notification.rb b/app/models/notification.rb
index c0537397c..b066cd87a 100644
--- a/app/models/notification.rb
+++ b/app/models/notification.rb
@@ -2,6 +2,7 @@
 
 class Notification < ApplicationRecord
   include Paginable
+  include Cacheable
 
   belongs_to :account
   belongs_to :activity, polymorphic: true
@@ -15,7 +16,7 @@ class Notification < ApplicationRecord
 
   STATUS_INCLUDES = [:account, :stream_entry, :media_attachments, :tags, mentions: :account, reblog: [:stream_entry, :account, :media_attachments, :tags, mentions: :account]].freeze
 
-  scope :with_includes, -> { includes(status: STATUS_INCLUDES, mention: [status: STATUS_INCLUDES], favourite: [:account, status: STATUS_INCLUDES], follow: :account) }
+  cache_associated status: STATUS_INCLUDES, mention: [status: STATUS_INCLUDES], favourite: [:account, status: STATUS_INCLUDES], follow: :account
 
   def activity
     send(activity_type.downcase)
diff --git a/app/models/status.rb b/app/models/status.rb
index f9dcd97e4..8f65a3ecc 100644
--- a/app/models/status.rb
+++ b/app/models/status.rb
@@ -3,6 +3,7 @@
 class Status < ApplicationRecord
   include Paginable
   include Streamable
+  include Cacheable
 
   belongs_to :account, inverse_of: :statuses
 
@@ -27,7 +28,8 @@ class Status < ApplicationRecord
   default_scope { order('id desc') }
 
   scope :with_counters, -> { select('statuses.*, (select count(r.id) from statuses as r where r.reblog_of_id = statuses.id) as reblogs_count, (select count(f.id) from favourites as f where f.status_id = statuses.id) as favourites_count') }
-  scope :with_includes, -> { includes(:account, :media_attachments, :tags, :stream_entry, mentions: :account, reblog: [:account, :stream_entry, :tags, :media_attachments, mentions: :account], thread: :account) }
+
+  cache_associated :account, :media_attachments, :tags, :stream_entry, mentions: :account, reblog: [:account, :stream_entry, :tags, :media_attachments, mentions: :account], thread: :account
 
   def local?
     uri.nil?