- fixes #84

- making sure a list of strings is not treated as an array of arrays

Author: rptmat57

drf_excel/fields.py

@@ -160,7 +160,7 @@ def __init__(self, list_sep, **kwargs):
         super().__init__(**kwargs)
 
     def prep_value(self) -> Any:
-        if len(self.value) > 0 and isinstance(self.value[0], Iterable):
+        if len(self.value) > 0 and isinstance(self.value[0], Iterable) and not isinstance(self.value[0], str):
             # array of array; write as json
             return json.dumps(self.value, ensure_ascii=False)
         else: