Basic CRUD problem

Question

Hello, I am studying Django, and I met this problem: "Missing id in QueryDict in a multi Dict error". I try to solve this by many ways, including importing the id with 'idzz' into the form built by form.as_table, but at submit time the system sees no id. How can I inject the current id before a save(). I scanned many FAQ's and tutorials, Trying by the book, but still the same error. My create works, the edit part works but can't save !! What am i missing ?? Thanks for any help.

This is my view:

@login_required def modifier(request,id): idz = request.GET.getitem('id') aModifier = get_object_or_404(artisan,pk=request.GET['id']) form = PrincipaleForme(instance = aModifier)

if request.method == 'POST':



 if form.is_valid():
  form = PrincipaleForme(request.POST) 
  form.save()
  return HttpResponseRedirect('/')

 else:

  form = PrincipaleForme(instance = aModifier)

return render_to_response('modifier.html',{'form' : form,'idzz':aModifier.id})

The Model:

class artisan(models.Model):

nom   = models.CharField(max_length=100, unique=False)  
prenom   = models.CharField(max_length=100, unique=False)
qualite  = models.CharField(max_length=100, unique=False) 
adresse1  = models.CharField(max_length=100, unique=False) 
adresse2  = models.CharField(max_length=100, unique=False) 
commune  = models.CharField(max_length=100, unique=False) 
codepostal = models.CharField(max_length=100, unique=False) 
artisanat  = models.TextField(blank=True)  
creation  = models.DateField(auto_now_add = True)
inscrit  = models.BooleanField(default = True)  
photoA   = models.CharField(max_length=100, unique=False) 
photoB   = models.CharField(max_length=100, unique=False) 
photoC   = models.CharField(max_length=100, unique=False) 
photoD   = models.CharField(max_length=100, unique=False) 
photoE   = models.CharField(max_length=100, unique=False) 

#imageArtisans = models.ImageField(blank = True, upload_to = 'imgArtisans') #Ajouter des photos dans notre propre API
def __unicode__(self): 
 return self.nom

The Template:

{%block content%}

Modifier Artisan Num: {{id}}

---

 <table>

  {{form.as_table}}


 </table>
<p><input type="submit" name="submit" value="Enregistrer"></p> 
</form>  

<a href = "/" ><div id ="unNom">RETOUR</div></a>

{%endblock%}

Part of the URLS:

 (r'^creer/$', 'regional.cetteEtape.views.creer'),
 (r'^modifier/(.*)$', 'regional.cetteEtape.views.modifier'),