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There is a newer version: 7.7.0

from connexion.apps.flask_app import FlaskJSONEncoder

from {{modelPackage}}.base_model import Model


class JSONEncoder(FlaskJSONEncoder):
    include_nulls = False

    def default(self, o):
        if isinstance(o, Model):
            dikt = {}
            for attr in o.openapi_types:
                value = getattr(o, attr)
                if value is None and not self.include_nulls:
                    continue
                attr = o.attribute_map[attr]
                dikt[attr] = value
            return dikt
        return FlaskJSONEncoder.default(self, o)