NoReverseMatch with keyword argument uidb64 with Django 2.0

I can’t understand why my code doesn’t work. Before it worked, but now, when I run the server and test, the code does not work.

When the user is registering, I send him activation email, like this:

def send_activation_email(serializer, request, user):
    current_site = get_current_site(request)
    message = render_to_string('acc_active_email.html', {
        'user': user,
        'domain': current_site.domain,
        'uid': urlsafe_base64_encode(force_bytes(user.pk)),
        'token': account_activation_token.make_token(user),
    })
    mail_subject = 'Activate your blog account.'
    to_email = serializer.data['email']

    email = EmailMessage(mail_subject, message, to=[to_email])
    email.send()

acc_active_email.html

{% autoescape off %}
Hi {{ user.username }},
Please click on the link to confirm your registration,

http://{{ domain }}{% url 'activate' uidb64=uid token=token %}
{% endautoescape %}

and my url file

.
.
    url(r'^activate/(?P<uidb64>[0-9A-Za-z_-]+)/(?P<token>[0-9A-Za-z]{1,13}-[0-9A-Za-z]{1,20})/$',
        views.activate_account, name='activate'),
.
.

but I have this error:

Exception Type:     NoReverseMatch
Exception Value:    

Reverse for 'activate' with keyword arguments '{'uidb64': b'NDM', 'token': '4qz-8f770502bd8b02786da9'}' not found. 1 pattern(s) tried: ['activate/(?P<uidb64>[0-9A-Za-z_\-]+)/(?P<token>[0-9A-Za-z]{1,13}-[0-9A-Za-z]{1,20})/$']

highlights this line http://{{ domain }}{% url 'activate' uidb64=uid token=token %}

Answers:

Thank you for visiting the Q&A section on Magenaut. Please note that all the answers may not help you solve the issue immediately. So please treat them as advisements. If you found the post helpful (or not), leave a comment & I’ll get back to you as soon as possible.

Method 1

In Django 2.0 and 2.1 you should call decode() after base64 encoding the uid, to convert it to a string:

message = render_to_string('acc_active_email.html', {
    'user': user,
    'domain': current_site.domain,
    'uid': urlsafe_base64_encode(force_bytes(user.pk)).decode(),
    'token': account_activation_token.make_token(user),
})

See the note in the Django 2.0 release notes for more info.

In Django 2.2+, urlsafe_base64_encode returns a string, so there is no need to decode.

message = render_to_string('acc_active_email.html', {
    'user': user,
    'domain': current_site.domain,
    'uid': urlsafe_base64_encode(force_bytes(user.pk)),
    'token': account_activation_token.make_token(user),
})

It should be possible to write code that is compatible with Django <= 1.11, 2.0-2.1, and 2.2+, by using force_text. Note the following is untested.

from django.utils.encoding import force_text

message = render_to_string('acc_active_email.html', {
    'user': user,
    'domain': current_site.domain,
    'uid': force_text(urlsafe_base64_encode(force_bytes(user.pk))),
    'token': account_activation_token.make_token(user),
})

You can drop the force_text and use the second code snippet once you drop support for Django < 2.2.

Method 2

For newer versions of Django, you can use the slug syntax. For example:

path(
    'activate/<slug:uidb64>/<slug:token>/',
    views.activate_account, 
    name='activate'
)

Method 3

Maybe its stupid since the URL is not dynamic but it worked…

path('activate/(?P<uidb64>[0-9A-Za-z_-]+)/(?P<token>[0-9A-Za-z]{1,13}-[0-9A-Za-z]{1,20})/$', views.activate, name='activate'),

All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0