fix error

app/models/archive_file.rb

@@ -18,7 +18,7 @@ class ArchiveFile
   before_save do
     cat = self.category rescue nil
     if cat && ArchiveCategory.where(:category_id => cat.id).count==0
-      ArchiveCategory.create(category_id: cat.id.to_s)
+      ArchiveCategory.create(category_id: cat.id.to_s,sort_number: cat.sort_number)
     end
   end
 
@@ -109,10 +109,10 @@ class ArchiveFile
   end
 
   def save_archive_file_multiples
-	self.archive_file_multiples.each do |t|
-	  if t.should_destroy
-		t.destroy
-	  end
+  	self.archive_file_multiples.each do |t|
+  	  if t.should_destroy
+  		  t.destroy
+  	  end
     end
   end