On Feb 10, 2010, at 2:49 PM, Kent wrote:
After merge() returns, is there a way for me to pair each object in
the returned merge_obj with the object it was created from?
For example:
merged_obj = session.merge(object)
At the top level, it is trivial, merged_obj was created because of the
instance object
For single RelationProperties under the top level, it is fairly
simple, too.
That is:
merged.childattr was merged from object.childattr
Where it falls apart I think is if the RelationProperty.use_list ==
True
merged.list came from object.list, but is there a way for me to
reference the original objects inside the list.
Did merged.list[0] come from object.list[0] or object.list[1] or
object_list[2]?
I particularly can't use the pk because it won't always be set (often
this will be a new record)
Any suggestions?
the ordering of those lists (assuming they are lists and not sets) are
deterministic, especially with regards to the pending objects that have been
added as a result of your merge (i.e. the ones that wont have complete primary
keys). I would match them up based on comparison of the list of instances
that are transient/pending.
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