Create non strait forawrd SqlAlchemi relationship

I have 2 SqlAlchemy entities: study and series with 1 to many relation (study has many series). I crearted a relationship that way:

class SeriesDBModel(Base):
    __tablename__ = "series"

    series_uid = Column(String, primary_key=True)
    study_uid = Column(String, ForeignKey(StudyDBModel.study_uid))

    study = relationship("StudyDBModel", lazy="subquery", cascade="all")

class StudyDBModel(Base):
    __tablename__ = "study"

    study_uid = Column(String, primary_key=True)

My question is: Do I have to create the entities like this:

series = SeriesDBModel()
study = StudyDBModel()
series.study = study

Can I just create both entities independently but with the same study_uid? I'm asking because the second way i how I save my entities but using series.study returns None.

BTW, it's not a "sessio.commit()" issue. I'm verifing both entities exist in the DB before trying series.study..

I tried to fetch series.study as above.

source https://stackoverflow.com/questions/75289115/create-non-strait-forawrd-sqlalchemi-relationship

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