Django forms передать значение

class periods(models.Model):
    title = models.CharField(max_length=255)
    start_date = models.DateField(auto_now=False)
    end_date = models.DateField(auto_now=False)
 
    def __str__(self):
        return self.title
 
    def get_absolute_url(self):
        return reverse('period_app_detail', kwargs={"period_app_id": self.pk})
 
class contracts(models.Model):
    key_periods = models.ForeignKey(periods, on_delete=models.CASCADE, related_name='period_fk')
    title = models.CharField(max_length=255)
    contract_date = models.DateField(auto_now=False)
 
    def __str__(self):
        return self.title
 
class management(models.Model):
    title = models.CharField(max_length=255)
    man_key_periods = models.ForeignKey(periods, on_delete=models.CASCADE, related_name='man_period_fk')
    man_key_contracts = models.ForeignKey(contracts, on_delete=models.CASCADE, related_name='man_contract_fk')
 
    def __str__(self):
        return self.title

class periodsForm(forms.ModelForm):
    class Meta:
        model = periods
        fields = ['title', 'start_date', 'end_date']
 
    class contractsForm(forms.ModelForm):
        class Meta:
            model = contracts
            fields = '__all__'
    
    class managementForm(forms.ModelForm):
        class Meta:
        model = management
        fields = '__all__'

def period_app_detail(request, period_app_id):
    period_detail = periods.objects.get(pk=period_app_id)
    contracts_list = contracts.objects.filter(key_periods=period_app_id)
    management_list = management.objects.filter(man_key_periods=period_app_id)
 
    initial_dict = {
        "man_key_periods": period_app_id,
    }
 
    form_management = managementForm(request.POST or None, initial=initial_dict)
    if form_management.is_valid():
        form_management.save()
        form_reg.save()
    return HttpResponse("Saved.")

 form_management = managementForm(instance=management_list)