how do I add template conditions in the ListView class? - django

Question

I have a ListView class in views.py, I want to add a condition if the authenticated user displays another template
urls.py
from django.urls import path, include
from django.contrib.auth import views as auth_views
from .views import (
PostListView,
)
urlpatterns = [
path('', PostListView.as_view(), name='index'),
]
Views.py
from django.shortcuts import render, get_object_or_404
from django.views.generic import (
ListView,
)
from .models import Post
from django.contrib.auth.models import User
from django.contrib.auth import authenticate
class PostListView(ListView):
model = Post
template_name = 'page/index.html'
context_object_name = 'posts'
ordering = ['-date_posted']
paginate_by = 7
i want to add
if self.request.user.is_authenticated:
template_name = 'page/index.html'
else:
template_name = 'page/home.html'
Django 2.2.x

Answer 1

You can override the get_template_names function [Django-doc]:
class PostListView(ListView):
model = Post
context_object_name = 'posts'
ordering = ['-date_posted']
paginate_by = 7
def get_template_names(self):
if self.request.user.is_authenticated:
return ['page/index.html']
else:
return ['page/home.html']
As the documentation says, this function:
Returns a list of template names to search for when rendering the template. The first template that is found will be used.
If template_name is specified, the default implementation will return a list containing template_name (if it is specified).
That being said, if you do not plan to render the list on your home.html page, it might be better to perform a redirect to another page, instead of just rendering a page. Otherwise, if you later want to add more content to your home.html page, you will each time need to update all the views that render this.
The basic implementation [GitHub] in the TemplateResponseMixin [Django-doc] is thus:
def get_template_names(self):
"""
Return a list of template names to be used for the request. Must return
a list. May not be called if render_to_response() is overridden.
"""
if self.template_name is None:
raise ImproperlyConfigured(
"TemplateResponseMixin requires either a definition of "
"'template_name' or an implementation of 'get_template_names()'")
else:
return [self.template_name]