add class for pruning metatags

app/logical/daily_maintenance.rb

@@ -1,6 +1,7 @@
 class DailyMaintenance
   def run
     PostPruner.new.prune!
+    TagPruner.new.prune!
     Upload.delete_all(['created_at < ?', 1.day.ago])
     ModAction.delete_all(['created_at < ?', 3.days.ago])
     Delayed::Job.delete_all(['created_at < ?'], 1.day.ago)

app/logical/tag_pruner.rb

@@ -0,0 +1,7 @@
+class TagPruner
+  def prune!
+    Tag.without_timeout do
+      Tag.destroy_all(["post_count <= 0 and name like '%:%'"])
+    end
+  end
+end

app/models/tag.rb

@@ -455,22 +455,16 @@ class Tag < ActiveRecord::Base
         q = q.limit(params[:limit].to_i)
       end
       
-      case params[:order]
-      when "name"
+      if params[:order] == "name"
         q = q.reorder("name")
         
-      when "date"
+      elsif params[:order] == "date"
         q = q.reorder("id desc")
         
-      else
-        q = q.reorder("post_count desc")
-      end
-      
-      case params[:sort]
-      when "date"
+      elsif params[:sort] == "date"
         q = q.reorder("id desc")
-        
-      when "name"
+
+      elsif params[:sort] == "name"
         q = q.reorder("name")
 
       else