I'd like to create a relationship that joins a table linked to a related
table on a model:
I have a Vessel class, a Well class, and a Batch class.
Vessel and Well are related via a FK on Well (well.vessel_id) but Batch is
a many to many relationship with Well, e.g.
Batch(Base):
id = Column(Integer)
Well(Base):
id = Column(Integer)
vessel_id = Column(Integer)
batches = relationship("Batch", secondary="mix_well_tracked_entity")
Is it possible to make a relationship on Vessel to the Batches linked to
its wells?
Vessel(Base):
id = Column(Integer)
wells = relationship("Well")
wells_batches = relationship("Batch", ...???)
select * from vessel v join well w on w.vessel_id = v.id join
mix_well_tracked_entity mix1 on mix1.well_id = w.id join batch b on b.id =
mix1.tracked_entity_id;
--
SQLAlchemy -
The Python SQL Toolkit and Object Relational Mapper
http://www.sqlalchemy.org/
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