Form when foreign key is not primary key in parent

[awaisas]

Hi,

First of all thank you for this awesome library. I have spent time but are not able to find a good solution to solving the create form, when the sqlaclhemy relationship is defined like this:

class Parent(Base):
    __tablename__ = "parent"
    id = Column(Integer, primary_key=True)
    unique_identifier = Column(String, unique=True)

    # Other fields...


class Child(Base):
    __tablename__ = "child"
    id = Column(Integer, primary_key=True)
    parent_identifier = Column(String, ForeignKey("parent.unique_identifier"))
    parent = relationship(
        "Parent", primaryjoin="Parent.unique_identifier==Child.parent_identifier"
    )
    # Other fields...

I have tried to have a look at the QuerySelectField and it is always choosing the primary key of Parent as value. Is there any way to override this behaviour for it to rather choose in this instance unique_identifier. Will there be other steps also needed to make the inserts and edits work?