I want to map a table with a postgresql array as a primary key.
PostgreSQL supports it, and everything works until the session wants
to use the list returned from the query as an instance key. How can
I intercept the row returned to wrap it in a tuple? I can't figure
out translate_row!
"""
from sqlalchemy.orm import sessionmaker
from sqlalchemy import Column, Integer, create_engine
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.dialects.postgresql.base import ARRAY
engine = create_engine('postgresql:///avdd')
DB = sessionmaker(bind=engine)
class A(declarative_base()):
__tablename__ = 'a'
ids = Column(ARRAY(Integer()), primary_key=True)
A.__table__.delete(bind=engine).execute()
a = A()
a.ids = (1,2,3)
db = DB()
db.add(a)
db.commit()
del a, db
db = DB()
print db.query(A).all()
"""
Traceback (most recent call last):
File "testarraypk.py", line 25, in <module>
print db.query(A).all()
File "lib/sqlalchemy/orm/query.py", line 1217, in all
return list(self)
File "lib/sqlalchemy/orm/query.py", line 1376, in instances
rows = [process[0](row, None) for row in fetch]
File "lib/sqlalchemy/orm/mapper.py", line 1681, in _instance
instance = session_identity_map.get(identitykey)
File "lib/sqlalchemy/orm/identity.py", line 145, in get
state = dict.get(self, key, default)
TypeError: unhashable type: 'list'
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