Using many=True results in problem with Date type about marshmallow

[svenstaro]

Well, that's interesting! It's not a marshmallow problem since my minimal example for this works fine but rather the problem is to be found in flask-marshmallow. However, I'm gonna leave the issue open in this tracker for now since you maintain both repos anyway.

So:

from flask.ext.marshmallow import fields, Serializer
class ThingSerializer(Serializer):
    start_date = fields.fields.Date()
    class Meta:
        additional = blahblah

This works!

class ThingSerializer(Serializer):
    class Meta:
        fields = ['start_date']

This doesn't. Got it tracked down to that. Any idea why?

[svenstaro]

Seems to be an issue in my code. Still haven't tracked it down but serializing many=True with Date in another model works. Sorry for the noise.