diff --git a/app/models/ruling_weather_setting.rb b/app/models/ruling_weather_setting.rb
index 15dbe7e..3975bb0 100644
--- a/app/models/ruling_weather_setting.rb
+++ b/app/models/ruling_weather_setting.rb
@@ -4,7 +4,7 @@ class RulingWeatherSetting
   include Mongoid::Document
   include Mongoid::Timestamps
 
-  weather_api_url = "https://opendata.cwa.gov.tw".freeze
+  WEATHER_API_URL = "https://opendata.cwa.gov.tw".freeze
 
   field :time_offset, type: String, default: "+8"
   field :location, type: String, default: ""
@@ -41,7 +41,7 @@ class RulingWeatherSetting
     time_now = DateTime.now.new_offset(self.time_offset)
     today = time_now.strftime("%Y-%m-%d")
     custom_dataid = custom_dataid || self.dataid
-    url = "#{weather_api_url}/api/v1/rest/datastore/#{custom_dataid}.json"
+    url = "#{WEATHER_API_URL}/api/v1/rest/datastore/#{custom_dataid}.json"
     startt = "#{today}T00:00:00"
     endt = "#{today}T23:59:59"
     custom_location = custom_location || self.location
@@ -113,7 +113,7 @@ class RulingWeatherSetting
       if timeout_flag
         rain = cache["rain"].to_f rescue 0.0
       else
-        url2 = "#{weather_api_url}/api/v1/rest/datastore/O-A0002-001.json"
+        url2 = "#{WEATHER_API_URL}/api/v1/rest/datastore/O-A0002-001.json"
         begin
           res2 = net_http_get_response(URI.parse("#{url2}?#{data2.to_query}"))
           content2 = JSON.parse(res2.body)
@@ -150,7 +150,7 @@ class RulingWeatherSetting
     time_now = DateTime.now.utc.new_offset(self.time_offset)
     today = time_now.strftime("%Y-%m-%d")
     custom_dataid = custom_dataid || self.dataid
-    url = "#{weather_api_url}/api/v1/rest/datastore/#{custom_dataid}.json"
+    url = "#{WEATHER_API_URL}/api/v1/rest/datastore/#{custom_dataid}.json"
     startt = "#{today}T00:00:00"
     endt = "#{today}T23:59:59"
     custom_location = custom_location || self.location