Btukfyl

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.

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>