potential fix for #1310

app/models/post.rb

@@ -324,8 +324,6 @@ class Post < ActiveRecord::Base
     def update_tag_post_counts
       decrement_tags = tag_array_was - tag_array
       increment_tags = tag_array - tag_array_was
-      Post.execute_sql("UPDATE tags SET post_count = post_count - 1 WHERE name IN (?)", decrement_tags) if decrement_tags.any?
-      Post.execute_sql("UPDATE tags SET post_count = post_count + 1 WHERE name IN (?)", increment_tags) if increment_tags.any?
       Post.expire_cache_for_all(decrement_tags) if decrement_tags.any?
       Post.expire_cache_for_all(increment_tags) if increment_tags.any?
       Post.expire_cache_for_all([""]) if new_record? || id <= 100_000
@@ -338,7 +336,7 @@ class Post < ActiveRecord::Base
       self.tag_count_copyright = 0
       self.tag_count_character = 0
 
-      categories = Tag.categories_for(tag_array)
+      categories = Tag.categories_for(tag_array, :disable_caching => true)
       categories.each_value do |category|
         self.tag_count += 1
 

app/models/tag.rb

@@ -66,20 +66,21 @@ class Tag < ActiveRecord::Base
         select_value_sql("SELECT category FROM tags WHERE name = ?", tag_name).to_i
       end
 
-      def category_for(tag_name)
-        Cache.get("tc:#{Cache.sanitize(tag_name)}") do
+      def category_for(tag_name, options = {})
+        if options[:disable_caching]
           select_category_for(tag_name)
+        else
+          Cache.get("tc:#{Cache.sanitize(tag_name)}") do
+            select_category_for(tag_name)
+          end
         end
       end
 
-      def categories_for(tag_names)
+      def categories_for(tag_names, options)
         Array(tag_names).inject({}) do |hash, tag_name|
-          hash[tag_name] = category_for(tag_name)
+          hash[tag_name] = category_for(tag_name, options)
           hash
         end
-        # Cache.get_multi(tag_names, "tc") do |name|
-        #   select_category_for(name)
-        # end
       end
     end