Cross database join in sqlalchemy

Question

Is there a way in SQLAlchemy to do cross-database joins. To be specific, here is my use case:

Schema

1. db1.entity1
   1. entity1_id:

Answer 1

You probably need to pass the schema parameter to sqlalchemy.schema.Table. When using declarative base for ORM mapping, you can provide this extra parameter through the __table_args__ property on your classes.

class Entity2(Base):
    __tablename__ = 'entity2' ## I tried combination of <db>.<table> with no success
    __table_args__ = {'schema': 'db2'}
    entity2_id = Column(Integer, primary_key=True) 

class Entity1(Base):
    __tablename__ = 'entity1' ## I tried combination of <db>.<table> with no success
    __table_args__ = {'schema': 'db1'}
    entity1_id = Column(Integer, primary_key=True)
    entity2_id = Column(Integer, ForeignKey(Entity2.entity2_id))
    entity2 = relationship('Entity2')