'Circular dependency detected' with TableViz query

[gbrian]

Hi,

Having this error (I can't explain why) while using Table visualization with simple queries like "SELECT field, count(*) from table".
For some reason json_iso_dttm_ser is called for integer values. This function returns same object if it's not a dttm ans this causes the error.

I can't understand why is considering an integer as a non serializable but by the way this function should be returning a serialized value or raising an error.

I changed implementation in this way at utils.py:

def json_iso_dttm_ser(obj):
    """
    json serializer that deals with dates

    >>> dttm = datetime(1970, 1, 1)
    >>> json.dumps({'dttm': dttm}, default=json_iso_dttm_ser)
    '{"dttm": "1970-01-01T00:00:00"}'
    """
    if hasattr(obj, 'isoformat'):
        return obj.isoformat()
    return str(obj)

Please let mw know if you have issued same problem.
Thanks