Thank you.
I hesitate between using this way, or explicitly specify the relationship
(is this a good idea? In my test I found 3 relations after prepare()) :
class Thermostat(Base):
__tablename__ = 'thermostats'
idbuiltin = Column(Integer, ForeignKey('device.id'))
idthermometer = Column(Integer, ForeignKey('device.id'))
thermometer = relationship(Dispositif, foreign_keys=idthermometer)
builtin = relationship(Dispositif, foreign_keys=idbuiltin)
Another interesting point is how to detect this error to warn. I tried to
use name_for_scalar_relationship() for that, but I don't kow how to get the
relationships mapper.
Best regards
Le vendredi 1 janvier 2016 18:27:14 UTC+2, Michael Bayer a écrit :
>
> you need to use the name generation functions
> name_for_scalar_relationship() and/or name_for_collection_relationship()
> to produce different names in each case. The "constraint" parameter
> passed as we see in
>
> http://docs.sqlalchemy.org/en/rel_1_0/orm/extensions/automap.html#handling-simple-naming-conflicts
>
> is a ForeignKeyConstraint object, you can look inside of
> constraint.column_keys to see if it is ['idbuiltin'] or
> ['idthermometer'] and use that to generate a name.
>
>
>
> On 01/01/2016 04:16 AM, [email protected] <javascript:> wrote:
> > Hi all,
> >
> > I use automap with database reflection to import schema with sqlalchemy.
> >
> > In case I have two relationships on same foreign key in some table, only
> > one relationship is created by prepare(), the second one seems
> overwrited.
> >
> > My table looks like :
> >
> > |
> > Table('thermostat',
> > Base.metadata,
> > Column('id',INTEGER(),primary_key=True,nullable=False),
> > Column('idbuiltin',INTEGER(),ForeignKey('device.id')),
> > Column('idthermometer',INTEGER(),ForeignKey('device.id')))
> > |
> >
> > How to control relationship creation to produce two distinct
> relationships ?
> >
> > Thank you and Happy New Year !
> >
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