'type object 'Base' has no attribute '_decl_class_registry'

I am upgrading a library to a recent version of SQLAlchemy and I am getting this error

type object 'Base' has no attribute '_decl_class_registry'

On line

Base = declarative_base(metadata=metadata)

Base._decl_class_registry

How can I solve this?

pythonsqlalchemyjavacassandratriggers


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