From 3b4e52cb36e789ccc74e436a1c75d7781228bed0 Mon Sep 17 00:00:00 2001
From: Sam <sam.saffron@gmail.com>
Date: Mon, 28 Sep 2015 16:40:27 +1000
Subject: [PATCH] FEATURE: fragment cache for use with serializers

---
 app/serializers/application_serializer.rb | 25 +++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/app/serializers/application_serializer.rb b/app/serializers/application_serializer.rb
index ad570267a..245336ef7 100644
--- a/app/serializers/application_serializer.rb
+++ b/app/serializers/application_serializer.rb
@@ -1,3 +1,28 @@
+require 'distributed_cache'
+
 class ApplicationSerializer < ActiveModel::Serializer
   embed :ids, include: true
+
+  class CachedFragment
+    def initialize(json)
+      @json = json
+    end
+    def as_json(*_args)
+      @json
+    end
+  end
+
+  def self.expire_cache_fragment!(name)
+    fragment_cache.delete(name)
+  end
+
+  def self.fragment_cache
+    @cache ||= DistributedCache.new("am_serializer_fragment_cache")
+  end
+
+  protected
+
+  def cache_fragment(name)
+    ApplicationSerializer.fragment_cache[name] ||= yield
+  end
 end