commit=false and user id

Hopefully this will make sense.

You are on a page displaying information about a Person. You want to
add a log to this person so you fill in the form at the bottom of the
page. When that form is saved to a log object both the user that has
submitted the log, and the person to whom the log belongs get saved.

That is what I am trying to do.

My log class:

class Log(models.Model):
person = models.ForeignKey(Person)
user = models.ForeignKey(User, verbose_name="team member")
contact_date = models.DateTimeField(auto_now_add=True)
contact_detail = models.TextField()
modification_date = models.DateTimeField(auto_now=True)

My log_update view:

@login_required
@transaction.commit_on_success
def update_log(request):
form = LogForm(request.POST)
if form.is_valid():
f = form.save(commit=False)
f.user = request.user
f.person = request.person
f.save()
response_dict = {}
response_dict.update({'success': True})
return HttpResponse(json.dumps(response_dict),
mimetype="application/json")
else:
return HttpResponse(json.dumps(form.errors),
mimetype="application/json")

The only form visible on my Person page is contact_detail. I need both
the user.id and person.id to be saved with my form. So I've tried
using commit=False to fill in the missing fields that would prevent
the save from occurring (required fields) but I keep getting 500
server errors because of the missing fields.

Can anyone help please?

Thank you

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