fix unit

app/models/bulletin.rb

@@ -49,7 +49,7 @@ class Bulletin
     return true
   end
 
-  # before_save :fetch_dept
+  before_save :fetch_dept
 
   scope :can_display, ->{where(:is_hidden=>false,:is_preview => false).any_of({:postdate.lt=>Time.now, :deadline.gt=>Time.now},{:postdate.lt=>Time.now, :deadline=>nil}).order_by([:is_top, :desc])}
   scope :is_approved, ->{where(:approved => true)}
@@ -107,7 +107,7 @@ class Bulletin
   protected
 
   def fetch_dept
-    refetch_dept if self.new_record?
+    refetch_dept if self.new_record? && !self.is_preview
   end
 
 end