fix error

app/models/site_feed.rb

@@ -22,11 +22,11 @@ class SiteFeed
     end
   end
   before_destroy do
-    tmp = SiteFeedAnnc.where(feed_id: self.id).first
+    tmp = SiteFeedAnnc.where(feed_id: self.id)
     main_directory = File.join("#{Rails.root}","public","site_feeds")
     feed_directory = File.join(main_directory.to_s, self.id.to_s)
     FileUtils.rm_rf(feed_directory.to_s)
-    if !tmp.nil?
+    if tmp.count!=0
       tmp.destroy
     end
   end

config/routes.rb

@@ -16,6 +16,10 @@ Rails.application.routes.draw do
         end
         SiteFeedAnnc.where(:feed_id.nin=>SiteFeed.all.pluck(:id)).destroy
         SiteFeed.each do |site_feed|
+          count = SiteFeedAnnc.where(feed_id: site_feed.id).count
+          if count>1
+            SiteFeedAnnc.where(feed_id: site_feed.id).limit(count-1).destroy
+          end
           tmp = SiteFeedAnnc.where(feed_id: site_feed.id).first
           if site_feed.disabled != true
             if tmp.nil?

lib/feed_model/cache.rb

@@ -7,6 +7,10 @@ module FeedModel
       before_save :do_before_save
     end
     def recreate_annc_cache(feed)
+      count = SiteFeedAnnc.where(feed_id: feed.id).count
+      if count>1
+        SiteFeedAnnc.where(feed_id: feed.id).limit(count-1).destroy
+      end
       tmp = SiteFeedAnnc.where(feed_id: feed.id).first
       if tmp.nil?
         tmp = SiteFeedAnnc.new(feed_id: feed.id)