diff --git a/app/models/message.rb b/app/models/message.rb
index 309291183..3b0f89ef5 100644
--- a/app/models/message.rb
+++ b/app/models/message.rb
@@ -328,17 +328,27 @@ class Message < ActiveRecord::Base
   def delay_message_send
     if self.course
       if self.parent_id.nil?   # 发帖
-        self.delay.contain_messages_message
+        dm = []
+        self.course.members.includes(:user).each do |m|
+          if self.author.allowed_to?(:as_teacher, self.course) &&  m.user_id != self.author_id   # 老师 自己的帖子不给自己发送消息
+            dm << {course_message_type:'Message',course_message_id:self.id, :user_id => m.user_id,
+                   :course_id => self.board.course_id, :viewed => false}
+            if dm.size >= 30
+              self.delay.contain_messages_message(dm)
+              dm.clear
+            end
+            unless dm.empty?
+              self.delay.contain_messages_message(dm)
+            end
+          end
+        end
+
       end
     end
   end
 
-  def contain_messages_message
-    self.course.members.includes(:user).each do |m|
-      if self.author.allowed_to?(:as_teacher, self.course) &&  m.user_id != self.author_id   # 老师 自己的帖子不给自己发送消息
-        self.course_messages << CourseMessage.new(:user_id => m.user_id, :course_id => self.board.course_id, :viewed => false)
-      end
-    end
+  def contain_messages_message vs
+    CourseMessage.create(vs)
   end
 
   #更新用户分数     -by zjc
diff --git a/app/views/users/_my_issue_list.html.erb b/app/views/users/_my_issue_list.html.erb
index 29e4c9264..d9729b5b9 100644
--- a/app/views/users/_my_issue_list.html.erb
+++ b/app/views/users/_my_issue_list.html.erb
@@ -50,7 +50,7 @@
         </li>
         <li class="c_grey">
           <% if !activity.assigned_to_id.nil? && activity.assigned_to_id != 0 %>
-              <% if activity.try(:assigned_to).try(:realname).empty? %>
+              <% if activity.try(:assigned_to).try(:realname).blank? %>
                   <%= link_to activity.assigned_to, user_path(activity.assigned_to_id)%>
               <% else %>
                   <%= link_to activity.try(:assigned_to).try(:realname), user_path(activity.assigned_to_id)%>