Django is throwing a "[123L, 123L] is not JSON serializable"
Question: in my code i have:

    
    
    json.dumps({'foo': {'bar': [123L, 123L]}})
    

the long ints are primary keys. this line for some reason generates the error:

"[123L, 123L] is not JSON serializable"

When i try to execute it in python manage.py shell:

    
    
    json.dumps({'foo': {'bar': [123L, 123L]}})
    

works fine.

Can anyone tell me what's going on?

exact Django error:

Exception Type: TypeError Exception Value: [123L] is not JSON serializable
Exception Location: /usr/lib/python2.7/dist-packages/simplejson/encoder.py in
default, line 192


Answer: This works for me:

    
    
    from django.db.models.query import ValuesListQuerySet
    
    def default(o):
        if isinstance(o, ValuesListQuerySet):
            return list(o)
        raise TypeError(repr(o) + " is not JSON serializable")
    
    json.dumps(valueListObject, default=default)
    

