class Person(Entity):
'''A person.'''
__tablename__ = 'people'
id = Column(Integer, ForeignKey('entities.id'), primary_key=True)
first_name = Column(String(50))
middle_name = Column(String(50))
last_name = Column(String(50))
date_of_birth = Column(Date)
date_of_death = Column(Date)
relationships = relationship('Relationship',
foreign_keys='relationships.c.source_id')
__mapper_args__ = {
'polymorphic_identity': 'person'}
Missed the mapper args part of person.
On Thursday, April 17, 2014 10:02:54 AM UTC-7, Mats Nordgren wrote:
>
> class Entity(Base):
> '''A base for entities.'''
>
> __tablename__ = 'entities'
>
> id = Column(Integer, Sequence('entity_id_seq'), primary_key=True)
> type = Column(String(50))
>
> tax_id = Column(String(20))
>
> memberships = relationship('Membership')
>
> __mapper_args__ = {
> 'polymorphic_identity': 'entity',
> 'polymorphic_on': type}
>
> class Person(Entity):
> '''A person.'''
>
> __tablename__ = 'people'
>
> id = Column(Integer, ForeignKey('entities.id'), primary_key=True)
>
> first_name = Column(String(50))
> middle_name = Column(String(50))
> last_name = Column(String(50))
>
> date_of_birth = Column(Date)
> date_of_death = Column(Date)
>
> relationships = relationship('Relationship',
> foreign_keys='relationships.c.source_id')
>
> class Relationship(Base):
> '''A relationship.'''
>
> __tablename__ = 'relationships'
>
> source_id = Column(Integer, ForeignKey('people.id'), primary_key=True)
> target_id = Column(Integer, ForeignKey('people.id'), primary_key=True)
> relationship_type_id = Column(Integer, ForeignKey('
> relationship_types.id'), primary_key=True)
>
> from_date = Column(Date)
> thru_date = Column(Date)
>
> notes = Column(Text)
>
> source = relationship('Person', foreign_keys=source_id)
> target = relationship('Person', foreign_keys=target_id)
> relationship_type = relationship('RelationshipType',
> foreign_keys=relationship_type_id)
>
> class RelationshipType(Base):
> '''A relationship type.'''
>
> __tablename__ = 'relationship_types'
>
> id = Column(Integer, Sequence('relationship_type_id_seq'),
> primary_key=True)
>
> description = Column(String(50))
>
>>
>>
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