redis对象开启

config/initializers/redis_cache.rb

@@ -1,3 +1,3 @@
 redis_config = Rails.application.config_for(:redis)
 cache_url = redis_config["url"] || 'redis://localhost:6379'
-# $redis_cache = Redis.new(url: cache_url, db: 2)
+$redis_cache = Redis.new(url: cache_url, db: 2)