On 10/28/2016 10:48 AM, Kent wrote:
@validates and 'set' attribute events will only fire when the /user/
sets a property (setattr), not when initially loaded by the orm.
Is there a way to intercept (for inspection) a scalar relationship
property instance when it is loaded? I don't think the 'load' event
will work because I won't know if the current instance is being loaded
in the context of setting an instrumented attribute.
For example:
If I have a parent object, I want to know when parent.childobj is
populated by the orm framework (whether on a lazy load or joined load).
Is that possible?
Thanks in advance!
based on the laws of twos, being that any random issue that has never
been asked ever for ten years will suddenly be asked for twice within
two days, the answer is no! the event proposed would be
collection_populate, at the same time we'd add scalar_populate, see
https://groups.google.com/d/msg/sqlalchemy/IfuUwUgKwW0/5ZgPmpAvBAAJ .
Interim solution is to subclass Query and override __iter__. The
load() event will get you eagerly-loaded attributes though, set it on
"parent"'s class and then inspect "childobj".
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