Marshmallow: Allow empty value for field

[gianchub]

Hello,

would you consider adding the ability to specify something like allow_empty=True (or False) when declaring a field like fields.Str? This would allow me to check for an empty string without having to code a validator for it (unless there is already another way of doing it that I'm missing...).

Kind regards,
Fabrizio

[sloria]

You can use the built-in Length validator to validate against empty strings:

from marshmallow import validate, fields
not_empty = validate.Length(min=1)

foo = fields.Str(validate=not_empty)

[gianchub]

I see. Cool, thank you :)