[Answered ]-Django: ForeignKey and instance

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You should have a look over the django-docs

You need to create a Calendar instance first.
Somewhat like this:

title= 'traction'
macategorie= 'Atomisation'
moncalendar = Calendar.objects.create(name="Atomisation", slug="atomisation")
p = Event(title= title, calendar= moncalendar)

EDIT
If you want to make sure, that the Calendar object is unique by the slug, try:

moncalendar, created = Calendar.objects.get_or_create( slug="atomisation")
moncalendar.name = "Atomisation"
moncalendar.save()

For this to work, you would need to change your model to something like this:

name = models.CharField(_('name'), max_length=50, blank=True, default="")

or 

name = models.CharField(_('name'), max_length=50, blank=True, null=True)

or you would put it in an try-except and handle the case, where you try to add a Calendar with a same slug explicitly.
Somehow like this:

try:
    moncalendar = Calendar.objects.create(name="Atomisation", slug="atomisation")
except IntegrityError:
    moncalendar = Calendar.objects.get(slug="atomisation")
    moncalendar.name = "Atomisation"  # or handle differently as you like
    moncalendar.save()

See here for more information.

👤Remi Smirra

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