How to get user ID and ID of newly created record in a CreateView?

Hi, I am using a CreateView.  I want to create some related data on a table ("Log" model), so I need the ID of the record being created for the related field (see "flow" below).  Also I need the ID of the user creating the record.  Something like the following:

from django.utils import timezone

from django.views.generic.edit import CreateView

from django.contrib.auth.decorators import login_required

from flow.models import Flow, Log

class CreateFlow(CreateView):

    model = Flow

    fields = ['state']

    template_name = 'create_flow.html'

    # there is a problem with this:

    @login_required

    def form_valid(self, form):

        form.instance.created_by = self.request.user

        # ... and this:

        log = Log(user=self.request.user.id, flow=id, state=1, created=timezone.now)

        log.save()

        return super(CreateFlow, self).form_valid(form)

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