Generic detail view UserProfileDetailView must be called with either an object pk or a slug in the URLconf

Question

Well I am facing error and it\'s now its been two days to this question and still stuck on this mistake, anybody can help and able to fix this. I am new in Django and need help.

Answer 1

Problem

1. str type used instead of slug type in urls.py
2. UserProfileDetailView doesn't specify your custom slug_url_kwarg and slug_field
3. UserProfileDetailView specifies UserProfile model but UserProfile model doesn't have attribute or method username, which is on `User table.

Solution

Reading Django's DetailView code, you'll find that the following is necessary to get your code working properly.

Update class attributes

views.py

class UserProfileDetailView(DetailView):
    slug_url_kwarg = "username"
    slug_field = "username"

Update UserProfile model OR Update UserProfileDetailView.get_slug_field

UserProfile is the lookup table defined for UserProfileDetailView and get_slug_fieldmethod, which readsslug_fieldproperty on the UserProfileDetailView doesn't support dot syntax method traversal (ie:user.username`). Thus either:

1. UserProfile model must have reference to username or;
2. get_slug_field must explicitly define slug field or;
3. get_slug_field must add functionality for dot syntax method traversal

models.py

class UserProfile(models.model):
    ...
    
    @property
    def username(self):
        self.user.username 

OR

class UserProfileDetailView(DetailView):
    ...

    def get_slug_field(self):
        self.user.username

Update username type in urls.py

Helpful, but not necessary.

urls.py

path('/', UserProfileDetailView.as_view(), name = 'detail'),

References

Django Detail View get_slug_field (Github): https://github.com/django/django/blob/master/django/views/generic/detail.py#L78-L80