App_step.readme_id may not be NULL

I am new to Django and am trying to save two objects from the same form. 

Models:

class ReadmeTemplate(models.Model):

    """

        Represents a bugfix README

        Contains step models, which contain multiple steps.

    """

    def __unicode__(self):

        return self.title

    title = models.CharField(max_length=200)

    author = models.CharField(max_length=200)

    user = models.ForeignKey(User,editable=False)

class Step(models.Model):

    """

        Represents a single step in a Readme Template

    """

    step_text = models.TextField()

    readme = models.ForeignKey(ReadmeTemplate)

I am able to save the ReadmeTemplate fine, but the Steps are not able to be saved. Here is what I am trying in the view.

def createTemplate(request):

    StepFormSet = modelformset_factory(Step, max_num=100, form=CreateStepForm,extra=1)

    if(request.method == 'POST'):

        readme_form = CreateReadmeTemplateForm(request.POST)

        step_forms = StepFormSet(request.POST)

        if readme_form.is_valid() and step_forms.is_valid():

            try:

                readme_object = readme_form.save()

                readme_object.user = request.user

                readme_object.save()

                step_forms.readme_id = readme_object.id

                step_forms.save()

            except forms.ValidationError, error:

                readme_object = None

            return HttpResponse('<script type="text/javascript">opener.dismissAddAnotherPopup(window, "%s", "%s");</script>' % (escape(readme_object._get_pk_val()), escape(readme_object)))

        return render(request,'App/newtemplate.html',{'readme_form':readme_form,'step_forms': step_forms})

    else:

        readme_form = CreateReadmeTemplateForm()

        step_forms = StepFormSet(queryset=Step.objects.none())

        return render(request,'App/newtemplate.html',{'readme_form':readme_form,'formset': step_forms})

Is there anyway to get the id of the readme object and assign it to the step object? Thanks for any help.

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