Create Redisable#redis (#9633)

* Create Redisable

* Use #redis instead of Redis.current

app/models/feed.rb

@@ -1,6 +1,8 @@
 # frozen_string_literal: true
 
 class Feed
+  include Redisable
+
   def initialize(type, id)
     @type = type
     @id   = id
@@ -27,8 +29,4 @@ class Feed
   def key
     FeedManager.instance.key(@type, @id)
   end
-
-  def redis
-    Redis.current
-  end
 end