How to create a link between Posts List View and Items List View of the same User

I am creating a project where there are Posts and Items, 2 different models in 2 different apps and each has a user who can be the same.

I have created a page for each user to post all related posts called Userpost List view, and I want to add an if statement or a queryset to show a button to link the items related to the same user called Designerpost List view.

I don't know how to proceed as I can fix the NoReverse Error

Here is the models.py

class Post(models.Model):      designer = models.ForeignKey(User, on_delete=models.CASCADE)      title = models.CharField(max_length=100)

Here is the views.py

class UserPostListView(ListView):      model = Post      template_name = "user_posts.html"      context_object_name = 'posts'      queryset = Post.objects.filter(admin_approved=True)      paginate_by = 6        def get_queryset(self):          user = get_object_or_404(User, username=self.kwargs.get('username'))          return Post.objects.filter(designer=user, admin_approved=True).order_by('-date_posted')

Here is the template user_posts.html

{% if item %}   <a class="primary btn-lg" href="{% url 'core:designer-posts' item.designer %}" role="button">Go to items</a>  {% else %}    <a href="{% url 'core:designer-posts' item.designer %}">      <button type="button" class="btn btn-primary btn-lg btn-block">Go to items</button>    </a>     {% endif %}

here is the item models.py

class Item(models.Model):      designer = models.ForeignKey(          User, on_delete=models.CASCADE)      title = models.CharField(max_length=100)

here is the designerlist views.py that I am trying to link to from the user post view if it is available

class DesignerPostListView(ListView):      model = Item      template_name = "designer_posts.html"      context_object_name = 'items'      paginate_by = 6        def get_queryset(self):          user = get_object_or_404(User, username=self.kwargs.get('username'))          return Item.objects.filter(designer=user).order_by('-timestamp')

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