I was trying to create a blog app by following an online Django tutorial and while I was testing the sign-up page, I ran into a Value Error saying that the view did not return a HTTP response object. i tried everything but i could not find the answer as i am not a Django expert
in the users app's views.py file was the code that threw the error
from django.shortcuts import render, redirect
from django.contrib.auth.forms import UserCreationForm
from django.contrib import messages
def register(request):
if request.method == 'POST':
form = UserCreationForm(request.POST)
if form.is_valid():
username = form.cleaned_data.get('username')
messages.success(request, f'Account Created for {username}')
return redirect('blog-home')
else:
form = UserCreationForm()
return render(request, 'users/register.html', {'form': form})
and this is the register template
{% extends "myblog/base.html" %}
{% block content %}
<div class="content-section">
<form method="POST">
{% csrf_token %}
<fieldset class="form-group">
<legend class="border-bottom mb-4">
Join Today!
</legend>
{{ form.as_p }}
</fieldset>
<div class="form-group">
<button class="btn btn-outline-info" type="submit">
Sign Up!
</button>
</div>
</form>
<div class="border-top pt-3">
<small class="text-muted">
Already Have an account?
Sign In!
</small>
</div>
</div>
{% endblock content%}
And this is the file structure of the project
File Structure
If we have a POST request, and the form is not valid, you do not return anything. Unindent the render call, so:
def register(request):
if request.method == 'POST':
form = UserCreationForm(request.POST, request.FILES)
if form.is_valid():
username = form.cleaned_data.get('username')
messages.success(request, f'Account Created for {username}')
return redirect('blog-home')
else:
form = UserCreationForm()
return render(request, 'users/register.html', {'form': form})
You can write function like this ...
def register(request):
form = UserCreationForm()
if request.method == 'POST':
form = UserCreationForm(request.POST)
if form.is_valid():
username = form.cleaned_data.get('username')
messages.success(request, f'Account Created for {username}')
return redirect('blog-home')
else:
form.errors
context = {'form': form}
return render(request, 'users/register.html', context)
return something for the function register also , you are returning only in if else conditions
return render(request, 'users/register.html', {'form': form}) add this at the end of the function outiside if else (now we have returned something for the function register also , you are returning only in if else conditions
Related
I am using the UserCreationForm for user registration in my Django web app. When the user fills in the detail (username, password, confirm_password) and submits, then if the form fails validation (maybe because username already exists or password don't match or password is too short) then the user is redirected back to the register page.
Now my problem is that when he is redirected back to the register page, the form is blank again, i.e. he has to start all over again, which is not a good user experience because his form might fail one or more times.
I want that if the form fails validation and when he is redirected to the registration form, he should see his previously filled in details so that he can just correct the field which is causing the error and move on. Is there any way the data can be retained?
Here is my code of the register function in views.py:
def register(request):
if request.method == 'POST':
form = UserCreationForm(request.POST or None)
if form.is_valid():
# some code
return redirect('login')
else:
messages.error(request, form.errors)
return HttpResponseRedirect(reverse("register"))
else:
return render(request, 'accounts/register.html')
my register.html:
<form method="POST" action="{% url 'register' %}">
{% csrf_token %}
<input name="username" type="text" class="..." style="...">
<input name="password1" type="password" class="..." style="...">
<input name="password2" type="password" class="..." style="...">
<button type="submit">Sign up</button>
</form>
Edit:
I have not passed the form in context to the template, so that I can control the CSS of my input fields, which I am not sure how to do otherwise without creating forms.py file separately.
If it's not possible to retain details in the form, then what should I do to at least improve the present situation?
Instead of return redirect just render the response with the form object again:
def register(request):
if request.method == 'POST':
form = UserCreationForm(request.POST or None)
if form.is_valid():
# some code
return redirect('login')
messages.error(request, form.errors)
else:
form = UserCreationForm()
return render(request, 'accounts/register.html', {'form': form})
In the template since you want to control css use django-widget-tweaks:
{% load widget_tweaks %}
<form method="POST" action="{% url 'register' %}">
{% csrf_token %}
{% render_field form.username class="..." style="..." %}
{% render_field form.password1 class="..." style="..." %}
{% render_field form.password2 class="..." style="..." %}
<button type="submit">Sign up</button>
</form>
The load widget tweaks must be at the top of the html file like all load tags.
def register(request):
context = {}
if request.method == 'POST':
form = UserCreationForm(request.POST or None)
if form.is_valid():
# some code
return redirect('login')
else:
context['form'] = form
messages.error(request, form.errors)
context['form'] = UserCreationForm()
return render(request, 'accounts/register.html', context)
it should work
I want to upload only button and don't need refresh when upload how to fix this
model_form_upload.html
<form method="post" enctype="multipart/form-data">
{% csrf_token %}
{{ form.as_p }}
<button type="submit" >Upload</button>
</form>
forms.py
class DocumentForm(forms.ModelForm):
class Meta:
model = DocumentFile
fields = ['document']
views.py
def model_form_upload(request):
if request.method == 'POST':
form = DocumentForm(request.POST, request.FILES)
if form.is_valid():
form.save()
return redirect('home')
else:
form = DocumentForm()
print(form)
return render(request, 'model_form_upload.html', {'form': form})
The view ats.views.index didn't return an HttpResponse object. It returned None instead.
I am trying to implement an authentication system, if I enter the password correctly I don't bump into any problems but when I enter it incorrectly I get this error. Does anyone know how I could solve this?
This is my view
def index(request):
if request.method == 'POST':
form = AuthenticationForm(data=request.POST)
if form.is_valid():
user = form.get_user()
login(request, user)
return render(request, "homepage.html", context_instance=RequestContext(request))
else:
form = AuthenticationForm()
return render(request, "index.html", {'form': form})
This is my html
{% block content %}
<form class="box" method = "post">
{% csrf_token %}
<h1>Ats</h1>
{{ form }}
<input type="submit" name="" value="Login">
</form>
{% endblock %}
The request can be a POST request, but where the form.is_valid() does not hold. In that case, your view, will return None.
You should "unindent" the return render(..) part:
from django.shortcuts import redirect
def index(request):
if request.method == 'POST':
form = AuthenticationForm(data=request.POST)
if form.is_valid():
user = form.get_user()
login(request, user)
return redirect('some-view-name')
else:
form = AuthenticationForm()
return render(request, 'index.html', {'form': form})
Note that here your view does not performs authentication. You should first check if the password (or some other token) matches. See the documentation on authenticate(..) [Django-doc] for more information.
In case of a successful POST request, you should make a redirect to implement the Post/Redirect/Get pattern [wiki].
Rearranging the code should work
def index(request):
form = AuthenticationForm()
if request.method == 'POST':
form = AuthenticationForm(data=request.POST)
if form.is_valid():
user = form.get_user()
login(request, user)
return render(request, "homepage.html", context_instance=RequestContext(request))
return render(request, "index.html", {'form': form})
You are getting this problem because you haven't written a HttpResponse object if the form is not valid.
To overcome this in your view write return an HTTP response if the form is not valid.
def index(request):
if request.method == 'POST':
form = AuthenticationForm(data=request.POST)
if form.is_valid():
user = form.get_user()
login(request, user)
return render(request, "homepage.html", context_instance=RequestContext(request))
else:
return render(request, "index.html", {'form': form, 'errors': form.errors})
else:
form = AuthenticationForm()
return render(request, "index.html", {'form': form})
in index.html
{% block content %}
{% if errors %}
{{ errors }}
{% endif %}
<form class="box" method = "post">
{% csrf_token %}
<h1>Ats</h1>
{{ form }}
<input type="submit" name="" value="Login">
</form>
{% endblock %}
or you can simply handle conditions and return default request if the request is not a post request.
def index(request):
form = AuthenticationForm()
if request.method == 'POST':
form = AuthenticationForm(data=request.POST)
if form.is_valid():
user = form.get_user()
login(request, user)
return render(request, "homepage.html", context_instance=RequestContext(request))
return render(request, "index.html", {'form': form})
You need to define the else condition if form is not valid.
def index(request):
if request.method == 'POST':
form = AuthenticationForm(data=request.POST)
if form.is_valid():
user = form.get_user()
login(request, user)
return render(request, "homepage.html", context_instance=RequestContext(request))
else:
return render(request, "index.html", {'form': form, 'errors': form.errors})
else:
form = AuthenticationForm()
return render(request, "index.html", {'form': form})
In your template you can show form errors by accessing this context variable {{ errors }}.
{% block content %}
{% if errors %}
{{ errors }}
{% endif %}
<form class="box" method = "post">
{% csrf_token %}
<h1>Ats</h1>
{{ form }}
<input type="submit" name="" value="Login">
</form>
{% endblock %}
Heyho,
I created a model Profile with a OnetoOneField to User. In account_settings view I want to either give the possibility to change the profile information or reset the password. Changing Profile-Information works fine, but when I try to change the password, my PasswordChangeForm is always invalid. Can somebody tell me where my mistake is?
Here's the view:
def account_settings(request, id):
user = Profile.objects.get(id=id)
if request.method == 'POST' and 'passwordchange' in request.POST:
user_form = PasswordChangeForm(request.user, prefix='password')
if user_form.is_valid():
user_form.save()
update_session_auth_hash(request, user)
messages.success(request, 'Your password was successfully updated!')
else:
messages.error(request, 'Please correct the error below.')
return redirect('profile', user.id)
elif request.method == 'POST' and 'profilechange' in request.POST:
profile_form = ProfileForm(request.POST, instance=request.user.profile,prefix='profil')
if profile_form.is_valid():
profile_form.save()
return redirect('account_settings',user.id)
#else:
#messages.error(request, _('Please correct the error below.'))
else:
user_form = PasswordChangeForm(user=request.user, prefix='password')
profile_form = ProfileForm(instance=request.user.profile,prefix='profil')
return render(request, 'app/accountform.html', {'profileuser': user,'user_form': user_form,'profile_form': profile_form})
the template:
<div class="col-md-9">
<div class="profile-content">
<form method="post" >
{% csrf_token %}
{{ profile_form.as_p }}
<button type="submit" name="profilechange">Änderungen speichern</button>
</form>
<form method="post" >
{% csrf_token %}
{{ user_form.as_p }}
<button type="submit" name="passwordchange">Passwort ändern</button>
</form>
Abbrechen
</div>
</div>
You are not passing the POST data to the form, which is why it is failing to validate. You need to pass the POST data when initialising it:
user_form = PasswordChangeForm(request.user, data=request.POST, prefix='password')
if user_form.is_valid():
# This should work now
Halo, i'm trying to upload a file using filefield. But i always failed. when statement form.errors.as_data() executed, the browser return 'tempfile'. I already trying to find solution from django documentation and some django references. But, still can't fix it. ;(
Here's my view.py
def dataprocessing(request):
if request.method == 'POST':
form = DocumentForm(request.POST, request.FILES)
if form.is_valid():
import pdb; pdb.set_trace()
newdoc = Document(docfile=request.FILES['myfile'])
newdoc.save()
#Redirect to the dataprocessing after POST
#return render(request, 'dataprocessing.html')
return HttpResponse("success")
else:
return HttpResponse(form.errors.as_data())
else:
import pdb; pdb.set_trace()
form = DocumentForm() #A empty, unbound form
return render(request, 'dataprocessing.html', {'form': form})
models.py
class Document(models.Model):
docfile = models.FileField(upload_to='documents/%Y/%m/%d')
forms.py
class DocumentForm(forms.Form):
tempfile = forms.FileField()
And dataprocessing.html
<form method="post" enctype="multipart/form-data" action="{% url "dataprocessing" %}">
<div class="form-group">
<label for="up">Input Data</label> {% csrf_token %}
<input type="file" name=myfile class="filestyle" data-buttonName="btn-primary" data-buttonBefore="true" data-size="sm" accept="application/vnd.ms-excel, application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"
id="up">
</div>
<div class="form-group">
<button type="submit" class="btn btn-primary btn-block">Upload Data</button>
<button type="button" class="btn btn-primary btn-block">Download Template</button>
</div>
</form>
How about using forms.ModelForm instaed forms.Form like this?
# forms.py
class DocumentForm(forms.Model):
class Meta:
model = Document
fields = ['tempfile']
and make your views.py like this:
# views.py
def dataprocessing(request):
if request.method == 'POST':
form = DocumentForm(request.POST, request.FILES)
if form.is_valid():
form.save()
return HttpResponse("success")
else:
return HttpResponse(form.errors.as_data())
else:
form = DocumentForm() #A empty, unbound form
return render(request, 'dataprocessing.html', {'form': form})
This makes form object can be saved directly to your model.