Field exists but django tells me "is not defined"

Hi All,

I'm dealing with really weird problem

My model
class Projet(models.Model):
...
fact = models.PositiveIntegerField('Numéro de
Facture',null=True,blank=True)
...
...

A simple view from this model is
def facture(request, id=None):
projet = Projet.objects.all()

So as far as I am, everything worked as expected
Now I wanted to change
projet = Projet.objects.all() to projet =
Projet.objects.filter(fact=None)
it will send projet filtered as expected (all projects with no number
assigned to the fact field) to template
So the template display this as expected...

Now, when I want to filter only projets with a assigned number to the
fact field its return

NameError at /facture/
global name 'fact' is not defined

Have i missed something?
I'm used with this kind of operation with django , but right now I'm a
bit lost...

Thanks in advance

Gregory Sémah

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