`fields.Nested` missing in the request returns an empty list `[]`

Hi, I would like to report a weird behavior I’ve stumbled upon. Consider we have the following schemas…

import marshmallow as ma

class OuterSchema(ma.Schema):
    outer_field_one = ma.fields.Str()
    outer_field_two = ma.fields.Str()
    outer_field_three = ma.fields.Nested('InnerSchema', many=True)

class InnerSchema(ma.Schema):
    inner_field_one = ma.fields.Str()
    inner_field_two = ma.fields.Str()

when I try to pass a request containing only the outer_field_one, I tend to get both the outer_field_one and outer_field_three with second one containing an empty list []. I’m expecting that since I didn’t include outer_field_three in the request, it shouldn’t be included.

I tried to see if this behavior might be native to marshmallow itself, and do the de-serializing myself, but apparently it returns the correct results, which contains only the outer_field_one.

Was this behavior intentional?? thanks

[lafrech]

Thank you guys for reporting/fixing this. Just got hit by this and latest release works a treat.

[sloria]

Thanks guys–I’ve released 1.5.1 with the fix.