Stringify cell value to resolve Excel issue

validata_ui_next/views.py

@@ -18,6 +18,13 @@ import tabulator
 
 def extract_source_data(source, preview_rows_nb=5):
     """ Computes table preview """
+
+    def stringify(val):
+        """ Transform value into string """
+        if val is None:
+            return ''
+        return str(val)
+
     header = None
     rows = []
     nb_rows = 0
@@ -26,7 +33,7 @@ def extract_source_data(source, preview_rows_nb=5):
             if header is None:
                 header = row
             else:
-                rows.append(row)
+                rows.append(list(map(stringify, row)))
                 nb_rows += 1
     return {'header': header,
             'data_rows': rows,