I'm not quite sure if this is helpful - it's not a general solution on
the ForeignKey specification so wouldn't work in admin, for example,
but it worked for me with my own form...
I was creating a view for a 'change' form. One parameter passed to
the view (from the URL) was an organisation identifier. I wanted to
restrict the choices in a ForeignKey form field to those which were
relevant to that organisation. This seemed to work:
def myobject_edit(request, org_id, obj_id):
org = get_object_or_404(Organisation, pk=org_id)
manip = Display.ChangeManipulator(obj_id)
manip['otherobj'].choices = [
(e['id'], e['name']) for e in
OtherObj.objects.filter(org__exact=org).values()
]
...
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