Improve "download rows as XLSX" for importer batch

still could be better, but at least this avoids error

tailbone/views/batch/importer.py

@@ -286,6 +286,30 @@ class ImporterBatchView(BatchMasterView):
         delete_query.execute()
         return self.redirect(self.get_action_url('view', batch))
 
+    def get_row_xlsx_fields(self):
+        return [
+            'sequence',
+            'object_key',
+            'object_str',
+            'status',
+            'status_code',
+            'status_text',
+        ]
+
+    def get_row_xlsx_row(self, row, fields):
+        xlrow = super(ImporterBatchView, self).get_row_xlsx_row(row, fields)
+
+        xlrow['status'] = self.enum.IMPORTER_BATCH_ROW_STATUS[row.status_code]
+
+        return xlrow
+
+
+def defaults(config, **kwargs):
+    base = globals()
+
+    ImporterBatchView = kwargs.get('ImporterBatchView', base['ImporterBatchView'])
+    ImporterBatchView.defaults(config)
+
 
 def includeme(config):
-    ImporterBatchView.defaults(config)
+    defaults(config)

tailbone/views/master.py

@@ -3850,8 +3850,14 @@ class MasterView(View):
         """
         Return the list of row fields to be written to CSV download.
         """
-        fields = []
+        try:
             mapper = orm.class_mapper(self.model_row_class)
+        except:
+            fields = self.get_row_form_fields()
+            if not fields:
+                fields = self.get_row_grid_columns()
+        else:
+            fields = []
             for prop in mapper.iterate_properties:
                 if isinstance(prop, orm.ColumnProperty):
                     fields.append(prop.key)