[odb-users] recursive loading

[MM]

Hello,
With a raw pointer, when issuing a

auto* ptr = db.load<myclass>(id);

Is it possible to have the pre-load c++ callback of myclass issue
another db.load<myclass>( another_id )

I'm having a core dump in this situation.

myclass member fields refer to other instances of the same type.

Rds,
MM

[Boris Kolpackov]

Post by MM
Is it possible to have the pre-load c++ callback of myclass issue
another db.load<myclass>( another_id )

Yes.

Post by MM
I'm having a core dump in this situation.

Must be a bug somewhere.

[MM]

Post by Boris Kolpackov

Post by MM
Is it possible to have the pre-load c++ callback of myclass issue
another db.load<myclass>( another_id )

Yes.

Post by MM
I'm having a core dump in this situation.

Must be a bug somewhere.

Sorry, it's not in the pre-load. I have it in the post-load callback.
In fact, I see that in the post-load cb:
db.load<myclass>(another_id)
instantiates a object, but it is empty. It appears it calls in the
generated odb code:

sts.delay_load (id, obj, ig.position ());

Apparently, the auto_lock is not locked.

Does any of this make sense?

[Boris Kolpackov]

Post by MM
Does any of this make sense?

Perhaps you are loading the same object recursively. Try to create a
session before the transaction.

[MM]

Post by MM

Post by Boris Kolpackov

Post by MM
Is it possible to have the pre-load c++ callback of myclass issue
another db.load<myclass>( another_id )

Yes.

Post by MM
I'm having a core dump in this situation.

Must be a bug somewhere.

Sorry, it's not in the pre-load. I have it in the post-load callback.
db.load<myclass>(another_id)
instantiates a object, but it is empty. It appears it calls in the
sts.delay_load (id, obj, ig.position ());
Apparently, the auto_lock is not locked.
Does any of this make sense?

An update here.
In the post-load callback, I've replaced the call to
db.load<myclass>(another_id)
//// returns an object but it remains empty
//// tracer shows that a SELECT query is issued indeed

with
auto res = db.query<myclass>( query::id == another_id);
for (auto& obj: res)
//// obj is correctly populated here

It seems db.load() inside of post-load callback of the 1st db.load()
doesn't work. But db.query does.

MM