Django serializer gives 'str' object has no attribute '_meta' error

Question

Hello!

I am trying to make Django view that will give JSON responce with earliest and latest objects. But unfotunately it fails to work with this error.

'str' object has no attribute '_meta'

I have other serialization and it works.

Here is the code.

def get_calendar_limits(request):
    result =  serializers.serialize("json", Session.objects.aggregate(Max('date'), Min('date')), ensure_ascii=False)
    return HttpResponse(result, mimetype="application/javascript")

Thanks a lot beforehand.

Answer 1

Take a look at the following:

objects= Session.objects.aggregate(Max('date'), Min('date'))
print [ type[o] for o in objects ]
result =  serializers.serialize("json", objects, ensure_ascii=False)

You might want to just run the above in interactive Python as an experiment.

What type are your objects? Is that type serializable?

Answer 2

I get the same error when trying to serialize an object that is not derived from Django's Model

Answer 3

Python has "json" module. It can 'dumps' and 'loads' function. They can serialize and deserialize accordingly.