How to prevent 'no username' in django?

Question

This is what my registration form looks like:

Registration form

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?

Tom Carrick · Accepted Answer · 2020-05-02 10:54:49Z

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.

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