Django Error form submission - django

Question

I have an app that let you create a profile.
One of my app feature is it's let you edit your name and upload a image.
The problem is the user cannot submit the image unless he type his name.How can I fix this page to make it so If the user submit an image but doesn't submit a name . He will still have his old name
or if he doesn't submit an image and changes his name . He will still have his old picture?
I tried adding blank=True and null = False , null = True but doesn't seem to do the job
My models.py
class Person(models.Model):
user = models.ForeignKey(User)
name = models.CharField(max_length=100,null=True,blank=False)
image = models.FileField(upload_to="images/")
def __unicode__(self):
return self.name
My forms.py
class PersonForm(forms.ModelForm):
class Meta:
model = Person
fields = ('image','name',)
My views.py
def Display(request):
if not request.user.is_authenticated():
return HttpResponseRedirect(reverse('world:LoginRequest'))
if request.method == 'POST':
form = PersonForm(request.POST, request.FILES)
if form.is_valid():
person = Person.objects.get(user=request.user)
person.image = form.cleaned_data['image']
person.name = form.cleaned_data['name']
person.save()
return render(request,'edit.html',{'form': PersonForm()})

Answer 1

class Person(models.Model):
user = models.ForeignKey(User)
name = models.CharField(max_length=100, blank=True)
image = models.FileField(upload_to="images/", blank=True)
def __unicode__(self):
return self.name
def Display(request):
if not request.user.is_authenticated():
return HttpResponseRedirect(reverse('world:LoginRequest'))
if request.method == 'POST':
form = PersonForm(request.POST, request.FILES)
if form.is_valid():
image = form.cleaned_data['image']
name = form.cleaned_data['name']
person = Person.objects.get(user=request.user)
if image:
person.image = form.cleaned_data['image']
if name:
person.name = form.cleaned_data['name']
person.save()
return render(request,'edit.html',{'form': PersonForm()})

Answer 2

django forms does validation on the users data
validation is done on two levels:
the field level:
if the field is required and the user didn't enter any data it will raise an error
if the user entered improperly formatted data for that field it will raise an error
you can override the behavior of field validation by implementing functions named as clean_fieldname
this type of validation results in form.field.errors
the form level:
checks for any (non-field specific) validation errors
you can override the behavior by implementing clean method
this type of validation results in form.non_field_errors
from your models:
image is not allowed to be blank which means it is required. not entering an image will raise an error
let blank=True for both name and image
also I recommend using form.save() over saving models from the views
also there is a built in ImageField for saving images