dlango MultiValueDictKeyError

[Ajeet Kumar Gupt]

Dear Team,

I am developing custom registration and login page for end-user but getting the below error. Please find the views.py code also in the trail.

MultiValueDictKeyError at /login/

'username'

Request Method:	GET
Request URL:	http://127.0.0.1:8000/login/
Django Version:	2.2.3
Exception Type:	MultiValueDictKeyError
Exception Value:	'username'
Exception Location:	C:\Python\Python37\lib\site-packages\django\utils\datastructures.py in __getitem__, line 80
Python Executable:	C:\Python\Python37\python.exe
Python Version:	3.7.3

-- 

Views.py

____________________________

rom django.shortcuts import render
from django.contrib.auth.models import User
from django.http import HttpResponseRedirect
from .forms import RegisterForm
from django.conf import settings
from django.shortcuts import redirect
from django.contrib.auth.decorators import login_required
from django.contrib import messages
from django.contrib.auth import authenticate,login
from django.contrib import auth
from django.core.exceptions import ObjectDoesNotExist


def user_register(request):
    # if this is a POST request we need to process the form data
    template = 'mymodule/register.html'
   # template = 'index.html'
    if request.method == 'POST':
        # create a form instance and populate it with data from the request:
        form = RegisterForm(request.POST)
        # check whether it's valid:
        if form.is_valid():
            if User.objects.filter(username=form.cleaned_data['username']).exists():
                return render(request, template, {
                    'form': form,
                    'error_message': 'Username already exists.'
                })
            elif User.objects.filter(email=form.cleaned_data['email']).exists():
                return render(request, template, {
                    'form': form,
                    'error_message': 'Email already exists.'
                })
            elif form.cleaned_data['password'] != form.cleaned_data['password_repeat']:
                return render(request, template, {
                    'form': form,
                    'error_message': 'Passwords do not match.'
                })
            else:
                # Create the user:
                user = User.objects.create_user(
                    form.cleaned_data['username'],
                    form.cleaned_data['email'],
                    form.cleaned_data['password']
                )
                user.first_name = form.cleaned_data['first_name']
                user.last_name = form.cleaned_data['last_name']
                user.phone_number = form.cleaned_data['phone_number']
                user.save()
                return redirect('index.html')
                # Login the user
                #login(request, user)
                #def user_login(request):
                # redirect to accounts page:
                #return render(request, '/login.html')
               # return HttpResponseRedirect(return, '/login.html')
               # No post data availabe, let's just show the page.
    else:
        form = RegisterForm()
        return render(request, template, {'form': form})





def login_view(request):
    username = request.POST['username']
    password = request.POST['pass']
    users = authenticate(request, username=username, password=password)
    if users is not None:
        login(request, users)
        return redirect('welcome.html')
    else:
        return redirect('index.html')



def logout(request):
    auth.logout(request)
    return render(request, 'login.html')

Thanks & Regards
Ajeet Kumar Gupt
+91-9311232332

[Sipum Mishra]

Hey Ajit,

This error comes when You are trying to get username, passwords from the form.

It is due to the below reason -

In Login,

You are using -> request.POST['username'] which will raise a KeyError exception if 'username' is not in request.POST.

Instead use -> request.POST.get('username') which will return None if 'username' is not in request.POST.

Additionally, .get allows you to provide an additional parameter of a default value which is returned if the key is not in the dictionary.

For example, request.POST.get('username', 'mydefaultvalue')

Hope this helps. If any concern then let us know.


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[Grace Nyokabi]

what error did you get?

--

[vishal singh]

 //users = authenticate(request, username=username, password=password)

you have to use Auth keyword to remove this exception as right now it is treated as a dict.

 users = Auth.authenticate(request, username=username, password=password)

--

[DPM]

Hey Vishal,

I don't think this error comes for what you told. The error raises for which I v mentioned above. 

And I agree with u as that is also have to do. As he did import auth so need to write auto.authentication.

To view this discussion on the web visit https://groups.google.com/d/msgid/django-users/CAMSP2afysMf%2BCiy2L8iRA2YejHvCQMon3JO3x5hd8bmWjuRAkw%40mail.gmail.com.

[Ajeet Kumar Gupt]

Hi,

Thank you very much now issues have been resolved.

To view this discussion on the web visit https://groups.google.com/d/msgid/django-users/CAGHZBzzRHrUvP7P1Aa-8qdsaDG65TBXUX54RJ8sxtU1G08c2Fg%40mail.gmail.com.

--

[DPM]

Hey Ajit, 

Its Great. 

Can you please tell us what was the problem? 

[Ajeet Kumar Gupt]

Hi,

Problem was in my code I was using the request.POST['username'] instead of request.POST.get('username')

You have given the solutions and the same I have implemented.

Once again thanks to you if any issues let you know. 

Actually, I am very new in Django hardly 1 week back started. This is my first project to start for the learning purpose and I try to implement a document management system with the workflow approval process.  I need your support and help while developing the application. Once the design part completed will share with you.

def login_view(request):
    templates = 'welcome.html'
    username = request.POST.get('username')
    password = request.POST.get('pass')
    user = authenticate(request, username=username, password=password)
    if user is not None:
        login(request, user)
        return render(request, templates ,{'user' : user  })
    else:
        #return redirect('welcome.html')
        messages.error(request, 'Login Failed! Invalid username and password.')
        return render(request, 'login.html',{'user' : user  })