Passage par les pk partout.

content/models.py

@@ -10,7 +10,7 @@ class Category(models.Model):
         verbose_name="Nom de la catégorie"
     )
     def get_absolute_url(self):
-        return reverse('content:category-list', kwargs={'category_id':self.id})
+        return reverse('content:category-list', kwargs={'pk':self.pk})
 
     def __str__(self):
         return self.name

content/urls.py

@@ -10,7 +10,7 @@ from .views import (
 app_name = 'content'
 urlpatterns = [
     path(
-        'category/<int:category_id>/',
+        'category/<int:pk>/',
         ContentCategoryList.as_view(),
         name='category-list'
     ),

content/views.py

@@ -12,14 +12,14 @@ class ContentCategoryList(generic.ListView):
     template_name = "content/content_list.html"
 
     def get_queryset(self):
-        category_id = self.kwargs['category_id']
-        category = get_object_or_404(Category, id=category_id)
+        pk = self.kwargs['pk']
+        category = get_object_or_404(Category, pk=pk)
         return Content.objects.filter(category=category)
 
     def get_context_data(self, **kwargs):
         context = super(generic.ListView, self).get_context_data(**kwargs)
-        category_id = self.kwargs['category_id']
-        category = get_object_or_404(Category, id=category_id)
+        pk = self.kwargs['pk']
+        category = get_object_or_404(Category, pk=pk)
         context['category'] = category
         return context
 

templates/nav_bar.html

@@ -17,12 +17,12 @@
     <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
       <ul class="nav navbar-nav">
         {% for c in categories %}
-        {% if category.id == c.id %}
+        {% if category.pk == c.pk %}
         <li class="active">
         {%else%}
         <li>
         {%endif%}
-            <a href="{% url 'content:category-list' category_id=c.id %}">{{c.name}}
+            <a href="{% url 'content:category-list' c.pk %}">{{c.name}}
         </a></li>
         {% endfor %}
 		<li><a href="{% url 'vote:home' %}">Vote</a></li>