How can I fix Django error MultiValueDictKeyError - django

Question

I try to log a user but I have this error: MultiValueDictKeyError at / "'username'". I followed django documentation: https://docs.djangoproject.com/en/1.7/topics/auth/default/#django.contrib.auth.decorators.login_required
views:
def home(request):
return render_to_response('home.html', {}, context_instance=RequestContext(request))
def login_user(request):
username = request.POST['username']
password = request.POST['password']
user = authenticate(username=username, password=password)
if user is not None:
if user.is_active:
login(request, user)
return HttpResponseRedirect('start.html')
else:
return HttpResponseRedirect('profile.html')
else:
return HttpResponseRedirect('home.html')
url:
url(r'^$', 'core.views.login_user', name='login_user'),
html:
<form action="/login_user" method="POST" name="auth">
{% csrf_token %}
<label>Email</label>
<input type="text" name="username">
<label>Password</label>
<input type="password" name="password">
<button type="submit">Login</button>
</form>

Answer 1

This question might help you:
Use the MultiValueDict's get method. This is also present on standard dicts and is a way to fetch a value while providing a default if it does not exist.
username = request.POST.get("username", False)
password = request.POST.get("password", False)

Answer 2

I see many errors in your code.
You are pointing your form action to /login_user and in your URL you don't have any /login_user defined so when you enter to root / it will load the login_user function.
I recommend you to do this:
Change your view to something like this:
def login_user(request):
if request.user.is_authenticated():
return HttpResponseRedirect(reverse('home'))
if request.method == 'POST':
form = AuthenticationForm(data=request.POST)
if form.is_valid():
usuario = request.POST['username']
clave = request.POST['password']
acceso = auth.authenticate(username=usuario, password=clave)
if acceso is not None:
if acceso.is_active:
login(request, acceso)
return HttpResponseRedirect(reverse('home'))
else:
form = AuthenticationForm()
script = "alert('Usuario no activo');"
return render(request, 'login.html', locals())
else:
form = AuthenticationForm()
script = "alert('Usuario y/o contraseña invalida');"
return render(request, 'login.html', locals())
else:
form = AuthenticationForm()
return render(request, 'login.html', locals())
in your template (login.html)
<form action="{% url "login" %}" method="post" accept-charset="utf-8">
{{ form }}
{% csrf_token %}
<input class="btn btn-default" type="submit" value="Iniciar Sesión" />
</form>
in your urls.py:
url(r'^$', 'core.views.home', name='home'),
url(r'^login/$', 'core.views.login_user', name='login'),
With this a nice form will be shown ;)