项目新闻、项目讨论区区分project和course

app/models/message.rb

@@ -127,7 +127,7 @@ class Message < ActiveRecord::Base
 
   # 发帖精辟更新发帖总数
   def add_boards_count
-    if self.parent_id.nil?
+    if self.project && self.parent_id.nil?
       count = self.project.boards_count + 1
       self.project.update_attribute(:boards_count, count)
     end
@@ -313,7 +313,7 @@ class Message < ActiveRecord::Base
 
   # 删除帖子的时候更新帖子总数, 删除回复的时候总数不减少
   def decrease_boards_count
-    if self.parent_id.nil?
+    if self.project && self.parent_id.nil?
       count = self.project.boards_count - 1
       self.project.update_attribute(:boards_count, count)
     end

app/models/news.rb

@@ -169,8 +169,10 @@ class News < ActiveRecord::Base
   end
 
   def decrease_news_count
-    count = self.project.news_count - 1
-    self.project.update_attribute(:news_count, count)
+    if self.project
+      count = self.project.news_count - 1
+      self.project.update_attribute(:news_count, count)
+    end
   end
 
   def send_mail