[StackOverflow/python] Django - Generic detail view DailyForecastDetailView must be called with either an object pk or a slug in the URLconf

### ROOT CAUSE The error occurs because the URL configuration (URLconf) for the `DailyForecastDetailView` does not include a required `pk` (primary key) or `slug` URL pattern parameter. The generic `DetailView` class-based view in Django expects these parameters to be present in the URL to retrieve the specific object. Without them, the view cannot determine which object to display, leading to the error. ### CODE FIX Update the URLconf to include either a `pk` or `slug` placeholder. Here's an example using `pk`: ```python # In your urls.py from django.urls import path from . import views urlpatterns = [ path('/', views.DailyForecastDetailView.as_view(), name='daily-forecast-detail'), ] ``` If you prefer to use `slug`, replace `pk` with `slug`: ```python urlpatterns = [ path('/', views.DailyForecastDetailView.as_view(), name='daily-forecast-detail'), ] ``` Ensure the URL pattern matches the field you intend to use (e.g., `slug_field` if using a non-primary-key field). This change allows the view to fetch the correct object based on the URL parameter.