Marshmallow: Help Wanted: AttributeError: 'list' object has no attribute 'data' on schema.dump(model).data in 3.0.0

[phalbert]

Deserializing a model in marshmallow 3.0.0 seems to have changed. I have been using v2.19.5 with schema.dump(model).data. However, this no longer works and the following error is now thrown:

AttributeError: 'list' object has no attribute 'data'

What is the alternative then?

[lafrech]

Please read the upgrade to 3.0 section of the docs.

You don't need to access .data attribute, dump already returns the data.

[phalbert]

thanks @lafrech