Create Redisable#redis (#9633)

* Create Redisable

* Use #redis instead of Redis.current

app/models/concerns/redisable.rb

@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+
+module Redisable
+  extend ActiveSupport::Concern
+
+  private
+
+  def redis
+    Redis.current
+  end
+end

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

app/models/trending_tags.rb

@@ -7,6 +7,8 @@ class TrendingTags
   THRESHOLD            = 5
 
   class << self
+    include Redisable
+
     def record_use!(tag, account, at_time = Time.now.utc)
       return if disallowed_hashtags.include?(tag.name) || account.silenced? || account.bot?
 
@@ -59,9 +61,5 @@ class TrendingTags
       @disallowed_hashtags = @disallowed_hashtags.split(' ') if @disallowed_hashtags.is_a? String
       @disallowed_hashtags = @disallowed_hashtags.map(&:downcase)
     end
-
-    def redis
-      Redis.current
-    end
   end
 end