[idea] Filter for non required fields with empty incoming data about marshmallow-peewee

[ak4nv]

In continuous of this idea:

from marshmallow_peewee import ModelSchema as _ModelSchema
from marshmallow import pre_load


class ModelSchema(_ModelSchema):

    @pre_load
    def drop_empty_fields(self, obj):
        for x in self.Meta.drop_empty_fields:
            if x in obj and not obj[x]:
                obj.pop(x)

    class Meta(_ModelSchema.Meta):
        drop_empty_fields = ()