1 files changed, 9 insertions, 3 deletions
diff --git a/app/models/gtfs_export.rb b/app/models/gtfs_export.rb
index bef468c32..d0b9fc4f9 100644
--- a/app/models/gtfs_export.rb
+++ b/app/models/gtfs_export.rb
@@ -1,12 +1,12 @@
 class GtfsExport < ExportTask
 
-  validates_presence_of :time_zone
+  validates_presence_of :time_zone, unless: Proc.new { |e| e.optional_attribute? :time_zone }
   attr_accessor :object_id_prefix, :time_zone
 
   enumerize :references_type, in: %w( network line company group_of_line stop_area )
-  
+
   after_initialize :init_params
-  
+
   def init_params
     if time_zone.nil?
       self.time_zone = "Paris"
@@ -34,6 +34,12 @@ class GtfsExport < ExportTask
     }
   end
 
+  def self.optional_attributes(references_type)
+    super.tap do |optional_attributes|
+      optional_attributes.push :time_zone, :start_date, :end_date if references_type == "stop_area"
+    end
+  end
+
   def data_format
     "gtfs"
   end