init project

app/libs/hot_search_keyword.rb

@@ -0,0 +1,24 @@
+# 基于Redis实现热门搜索关键字
+class HotSearchKeyword
+  class << self
+    def add(keyword)
+      return if keyword.blank?
+      Rails.logger.info("[Hot Keyword] #{keyword} score increment ~")
+      Rails.cache.data.zincrby(redis_key, 1, keyword)
+    end
+
+    def hot(limit = 5)
+      Rails.cache.data.zrevrange(redis_key, 0, limit - 1)
+    end
+
+    def available?
+      Rails.cache.is_a?(ActiveSupport::Cache::RedisStore)
+    end
+
+    private
+
+    def redis_key
+      'educoder:es:hot_keyword'
+    end
+  end
+end