#26142: Provide a way for model formsets to disallow new object creation
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Reporter: timgraham | Owner: Mortal
Type: New feature | Status: assigned
Component: Forms | Version: master
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 dsanders11):
Can you expand on that a little? Looking at the formset code, if the form
number is less than the initial form count, it uses
`save_existing_object`. Since `validate_max` prevents any forms above
initial form count from being a valid formset, the only way a new object
could be created is if `save_existing_object` could create new objects,
which would be a bug in itself probably.
Playing with it in Chrome, providing a blank value for the PK of one of
the objects in the formset will cause an error when
[https://github.com/django/django/blob/master/django/forms/models.py#L605
trying to use to_python on the PK value] since the value is blank and an
integer is expected. Even if that didn't fail, it would fail to find the
object by its PK in the queryset.
Providing a bogus value for the PK will also
[https://github.com/django/django/blob/master/django/forms/models.py#L588
fail to look up in the queryset] on the formset. This also occurs if you
use a PK for an existing object that isn't in the queryset, which is good,
otherwise you'd be able to modify objects outside the queryset which would
be very bad.
So, I'm not sure I see the path where new objects can be created if
`validate_max` is set and `max_num` is 0. Doesn't mean it's not there, but
it's not immediately obvious how that could occur.
--
Ticket URL: <https://code.djangoproject.com/ticket/26142#comment:6>
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