How to prevent 'no username' in django? - django

Question

This is what my registration form looks like:
I want to make it so that if the user doesn't write anything in the given text boxes, a warning sign pops up and say that ' a username must be inputted' or something like that
but when i click the submit button, Value error occurs, saying that "The given username must be set"
def register(request):
context = {
'error_message': None,
}
if request.method == 'POST':
username = request.POST['username']
password1 = request.POST['password1']
password2 = request.POST['password2']
email = request.POST['email']
if password1==password2:
if User.objects.filter(username=username).exists() or Person.objects.filter(username=username).exists():
context['error_message'] = '이미 사용중인 아이디입니다.'
return render(request, 'UserAdministration/register.html', context)
elif User.objects.filter(email=email).exists() or Person.objects.filter(username=username).exists():
context['error_message'] = '이미 사용중인 이메일입니다.'
return render(request, 'UserAdministration/register.html ', context)
else:
user = User.objects.create_user(
password=password1,
email=email,
username=username
)
user.save()
masked_username = generate_masked_username.generate_masked_username(username)
person = Person.objects.create(
username=username,
masked_username=masked_username,
email=email,
password=password1
)
person.save()
return redirect('login')
else:
context['error_message'] = '비밀번호가 맞지 않습니다.'
return render(request, 'UserAdministration/register.html', context)
# return redirect('/')
# originally was homepage.html. Doesn't know if this changed anything. just a note
else:
return render(request, 'UserAdministration/register.html', context)
This is my code... anybody know how to prevent this error?

Answer 1

This is what forms are for. You should use a Form (or ModelForm) rather than building the form and using request.POST manually. Then you will get better errors. These docs will be especially useful.
A quick example:
Form:
from django import forms
from django.contrib.auth import get_user_model
class RegistrationForm(forms.ModelForm):
class Meta:
model = get_user_model()
fields = ["username", "email", "password"]
View:
from django.urls import reverse_lazy
from django.views.generic.edit import CreateView
from .forms import RegistrationForm
class UserRegistrationView(CreateView):
form_class = RegistrationForm
template_name = "registration/register.html"
success_url = reverse_lazy("login")
This will get you most of the way there, you just need to add a custom field and some logic for the password2 validation and handle whatever the masked username stuff is.
Registration is such a common workflow however, that you can also use a package like django-registration to handle the details for you, and you can just override what you need for your custom logic where it's needed.