Improve Homeland.redis method. Follow Rails way, minimize external …

…dependencies

Redis in Rails has built-in ConnectionPool implement, not need extermal gem.

lib/homeland.rb

@@ -12,13 +12,9 @@ module Homeland
   cattr_reader :boot_at
 
   class << self
-    # Follow Redis offical guides make redis thread safety
-    # https://github.com/redis/redis-rb#connection-pooling-and-thread-safety
+
     def redis
-      @redis ||= ConnectionPool::Wrapper.new do
-        config = Rails.application.config_for(:redis)
-        Redis.new(url: config["url"], db: 0)
-      end
+      Rails.cache.redis.then {|redis| redis }
     end
 
     def file_store