For the background to the code I'm using, see this Stack Overflow question:
http://stackoverflow.com/questions/8394177/complex-foreign-key-constraint-in-sqlalchemy/8408659
My declarative code looks like this:
from MyGlobals import Base
from sqlalchemy import Column, Integer, String, ForeignKey,
UniqueConstraint, ForeignKeyConstraint
from sqlalchemy.orm import relationship
class SystemVariable(Base):
__tablename__ = 'SystemVariables'
id = Column(Integer, primary_key = True)
name = Column(String)
choice_id = Column(Integer)
__table_args__ = (ForeignKeyConstraint(['choice_id', 'id'],
['VariableOptions.id',
'VariableOptions.variable_id'],
name =
'SystemVariables_choice_id_fkey',
use_alter = True),
{})
options = relationship('VariableOption', backref = 'variable', cascade
= 'all, delete, delete-orphan')
choice = relationship('VariableOption', post_update = True)
class VariableOption(Base):
__tablename__ = 'VariableOptions'
id = Column(Integer, primary_key = True)
name = Column(String)
variable_id = Column(Integer, ForeignKey('SystemVariables.id'))
__table_args__ = (UniqueConstraint('id', 'variable_id'),
{})
For some reason, SQLA emits id SERIAL NOT NULL for the second table
(VariableOptions), but for the first one (SystemVariables) it's doing id
INTEGER NOT NULL. Seeing as I'm using Postgres, this means that the sequence is
not created for SystemVariables, which is a problem.
I've tried adding autoincrement = True and Sequence('SystemVariables_id_seq')
to the Column declaration, but neither helped.
None of my other tables have this problem. Why is SQLA doing this for this one,
and how can I fix it?
Thanks,
Cameron Jackson
Engineering Intern
Air Operations
Thales Australia
Thales Australia Centre, WTC Northbank Wharf, Concourse Level,
Siddeley Street, Melbourne, VIC 3005, Australia
Tel: +61 3 8630 4591
cameron.jack...@thalesgroup.com.au<mailto:cameron.jack...@thalesgroup.com.au> |
www.thalesgroup.com.au<http://www.thalesgroup.com.au>
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