I'm using session.add() to refresh my objects while working on them,
because I don't want to merge them with the persistent state. But it
appears deletes aren't carrying across to child relations:
$ cat listdelete.py; python listdelete.py
import sqlalchemy as sql
from sqlalchemy import orm
from sqlalchemy.ext.declarative import declarative_base
echo = 0
engine = sql.create_engine("sqlite:///:memory:", echo=bool(echo))
metadata = sql.MetaData(bind=engine)
DB = orm.sessionmaker(bind=engine)
T = declarative_base(metadata=metadata)
class A(T):
__tablename__ = 'a'
id = sql.Column(sql.Integer, primary_key=True)
info = sql.Column(sql.String)
cc = orm.relation('C',
backref='a',
cascade='all,delete-orphan')
def __repr__(self):
return " >> a: %s cc=%s" % (self.info, len(self.cc))
class C(T):
__tablename__ = 'c'
a_id = sql.Column(sql.Integer, sql.ForeignKey('a.id'),
primary_key=True)
i = sql.Column(sql.Integer, primary_key=True)
def get():
return DB().query(A).first()
def change(a, s, i):
orm.object_session(a).close()
db = DB()
db.add(a)
a.info = s
del a.cc[-1]
a.cc.append(C(i=i))
db.close()
metadata.create_all()
A.__table__.delete().execute()
db = DB()
a = A(id=1, info='blah', cc=[C(i=1), C(i=2)])
db.add(a)
db.commit()
db.close()
print get()
# merge and flush
a = get()
change(a, 'change one', 3)
db = DB()
db.merge(a)
db.commit()
db.close()
print get()
# add and flush
a = get()
change(a, 'change two', 4)
db = DB()
db.add(a)
db.commit()
db.close()
print get()
>> a: blah cc=2
>> a: change one cc=2
>> a: change two cc=3
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