I'm updating "sqlalchemy_django_query" for SQLAlchemy 1.4 and aside of that
I found a peculiar problem - when I call get_mapper on a table
(AnnotatedTable) I get a ValueError due to multiple mappers found.
The model is inherited by two other models and get_mapper finds mappers for
all 3 models due to this:
class Conversation(db.Base):
__tablename__ = 'conversation'
id = sqlalchemy.Column(postgres_dialect.UUID(as_uuid=True),
primary_key=True, default=uuid.uuid4)
...
type = sqlalchemy.Column(sqlalchemy.Text, nullable=False)
__mapper_args__ = {
'polymorphic_identity': 'conversation',
'polymorphic_on': type,
}
...
class ContactFormConversation(Conversation):
__tablename__ = 'contact_form_conversation'
id = sqlalchemy.Column(sqlalchemy.ForeignKey('conversation.id'),
primary_key=True, nullable=False)
...
__mapper_args__ = {
'polymorphic_identity': 'contact_form_conversation',
}
...
class RatingConversation(Conversation):
__tablename__ = 'rating_conversation'
id = sqlalchemy.Column(sqlalchemy.ForeignKey('conversation.id'),
primary_key=True, nullable=False)
...
__mapper_args__ = {
'polymorphic_identity': 'rating_conversation',
}
Should the model structure be done differently?
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