#23386: Document that F expressions are reapplied each time an object is saved
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Reporter: codefisher | Owner: nobody
Type: Cleanup/optimization | Status: new
Component: Documentation | Version: 1.6
Severity: Normal | Resolution:
Keywords: | Triage Stage: Accepted
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Comment (by codefisher):
Just thinking about this, I am really more inclined to say how it works
should be changed. I would suggest that after save() is called, it would
be like the object had been called with defer() on that field. I don't
think it would be hard to implement, I don't know the internals of the
ORM, but defer() is already there, so what ever it does could be used
again.
I can't see it causing backwards compatibility changes, this is
undocumented, and not very intuitive. I would even suggest that after
saving, that having the field affected by the F() expression not giving a
sensible value is a bug in itself, and should be fixed - by treating as
though marked by defer().
But there is always a change of causing backwards compatibility problems,
that would be very hard to track down. Which needs to be weighed against
how many problems the current counter intuitive behaviour would cause.
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Ticket URL: <https://code.djangoproject.com/ticket/23386#comment:4>
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