django prevent empty model being saved - django-models

Question

Is there a way to stop a model in django allowing an empty model to be saved?
e.g. I have a simple contact form
class Contact(models.Model):
alphabetical = RegexValidator(r'^[a-zA-Z]*$', 'Only alphabetical characters
are allowed', 'Invalid input')
name = models.CharField(max_length=200, validators=[alphabetical])
email = models.EmailField(validators=[EmailValidator, ])
subject = models.CharField(max_length=200)
message = models.CharField(max_length=250)
created_date = models.DateTimeField(auto_now_add=True)
How can I prevent an empty model being saved? e.g. in the django shell I can do
contact = Contact()
contact.save()
This gives a model with all blank values saved.

Answer 1

for validation you have to use django.forms. django forms will manage the validation part:
for eg: if your model.py is:
class Contact(models.Model):
name = models.CharField(max_length=200)
email = models.EmailField()
subject = models.CharField(max_length=200)
message = models.CharField(max_length=250)
created_date = models.DateTimeField(auto_now_add=True)
now create a view in views.py :
from django.forms import modelformset_factory
from django.shortcuts import render
from myapp.models import Contact
def manage_contacts(request):
ContactFormSet = modelformset_factory(Contact, fields=('name', 'email', 'subject', 'message'))
if request.method == 'POST':
formset = ContactFormSet(request.POST)
if formset.is_valid(): # check the validation for blank fields
formset.save()
# do something.
else:
formset = ContactFormSet()
return render(request, 'manage_contacts.html', {'formset': formset})
create a template in templates/manage_contacts.html:
<form method="post">
{{ formset }}
</form>