If you have a model with JSONB field, and there's a dumped date / datetime, marshmallow won't be able to serialize it due to it being serialized already (date and datetime strings will cause an error when tried to serialize)
smth like TypeError: descriptor 'isoformat' requires a 'datetime.date' object but received a 'str'
possible solution: load all JSONB fields when loading object, or just before serializing
from marshmallow import Schema, fields
from sqlalchemy.dialects.postgresql import JSONB
def load_jsonb_columns(instance, schema: Schema) -> None:
"""
:param instance:
:param schema:
:return:
"""
for attr in type(instance)._sa_class_manager.attributes:
if not isinstance(attr.expression.type, JSONB):
continue
if hasattr(instance, attr.name) and attr.name in schema.declared_fields:
fld: fields.Nested = schema.declared_fields[attr.name]
if not isinstance(fld, fields.Nested):
continue
deserialized = fld.schema.load(getattr(instance, attr.name))
setattr(instance, attr.name, deserialized)also there can be other types which require to be converted
If you have a model with JSONB field, and there's a dumped date / datetime, marshmallow won't be able to serialize it due to it being serialized already (date and datetime strings will cause an error when tried to serialize)
smth like
TypeError: descriptor 'isoformat' requires a 'datetime.date' object but received a 'str'possible solution: load all JSONB fields when loading object, or just before serializing
also there can be other types which require to be converted