I've written my own deep_clone for SA Object Trees, which is
exploiting quite some lowlevel calls inside SA
This has brought me to reimplement the cloning for every major version
change, I started in 0.3, updated to 0.4 with some major rework, but I
simply cant get it to work with 0.5.2, and I wonder how or why?!?!?!
there is 2 major reasons I could identify
1) is_backref allowed to judge which side of a backref I was on, now
no similar property exists, which also means I run into circular
CLONEs, which to prevent, there only seems to be
(v.property.backref and v.property.backref.kwargs == {}) to judge what
side I'm on
2) when I have a InstrumentedList property, i.e. I would getattr
(newobj, 'property').append(elem), this would automatically set
elem.`backref ` to the correct value, whereas now this is not updated
until flushed, which causes me tremendous consternation
for (2) I have no solution, this means I cant clone anymore without
major rework?
there surely must be an easier way to do a deep clone of everything
except session/SA data and manually specified properties (like ID's,
or ViewOnly references)
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