On Nov 22, 2010, at 4:32 PM, Alvaro Reinoso wrote:
> Hello all,
>
> I have these classes:
>
> class Screen(rdb.Model):
> """Represents the screen"""
> rdb.metadata(metadata)
> rdb.tablename("screens")
>
> id = Column("id", Integer, primary_key=True)
> title = Column("title", String(100))
>..
>
> crm = relationship("CRM", uselist=False, backref="screens")
>
> class CRM(rdb.Model):
> """Represents the CRM Tab"""
> rdb.metadata(metadata)
> rdb.tablename("crms")
>
> id = Column("id", Integer, ForeignKey("screens.id"),
> primary_key=True)
>title = Column("title", String(50))
> contactInformation = relationship("CRMContactInformation",
> uselist=False, backref="crms")
> endpointConfiguration = relationship("CRMEndpointConfiguration",
> uselist=False, backref="crms")
> location = relationship("CRMLocation", uselist=False, backref="crms")
> slaEvent = relationship("CRMSLAEvent", uselist=False, backref="crms")
> notes = relationship("CRMNote", uselist=True, backref="crms")
> log = relationship("CRMLog", uselist=True, backref="crms")
>
> I get this error when trying to delele a screen object:
>
> session.delete(screen)
> AssertionError: Dependency rule tried to blank-out primary key column
> 'crms.id' on instance ''
Its illegal for a primary key attribute to be NULL, so when deleting a Screen
you need to delete the CRM as well. Configure 'cascade="all, delete-orphan"'
on your crm relationship.
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