日报homework created_on to created_at

app/models/mailer.rb

@@ -122,7 +122,7 @@ class Mailer < ActionMailer::Base
                    @course_journal_messages,@user_journal_messages,@forums,@memos,@attachments,@bids].any? {|o|
                     !o.empty?
                   }
-    binding.pry
+    binding.pry if Rails.env.development?
     #有内容才发，没有不发
     mail :to => user.mail,:subject => subject if has_content
   end

app/views/mailer/send_for_user_activities.html.erb

@@ -90,7 +90,7 @@
                         :class => 'wmail_info',
                         :style => "color:#5a5a5a; float:left;   margin-right:5px; display:block;color:#1b55a7;overflow:hidden; white-space: nowrap; text-overflow:ellipsis;"
             %>
-            <span class="wmail_date" style="color:#6e6e6e; float:right;display:block; margin-left:10px;"><%= format_time(homework.created_on) %></span>
+            <span class="wmail_date" style="color:#6e6e6e; float:right;display:block; margin-left:10px;"><%= format_time(homework.created_at) %></span>
           </li>
       <% end %>
       <% end %>