Django: how to get the second last object from database? - django

Question

I have a model for news. I add news to the database with Django admin. Model Post consists of title, body and image.
On the main.html page of my project i have a carousel with 3 slides.
I already have some news in my database, and I want to display the last, the second last and so on images in that carousel.
My question is: what code should I add in html to display the last, the second last and the third last images?
<img src="???"> {# the last image #}
<img src="???"> {# the second last image #}
<img src="???"> {# the third last image #}

Answer 1

You can try like this:
posts= Post.objects.all().order_by('-id')
last_post = posts[0]
second_last_post = posts[1]
third_last_post = posts[2]
last_three_posts = posts[0:3]
But make sure to have atleast three posts or else it will throw index error

Answer 2

# views.py
from django.views.generic import TemplateView
class HomePageView(TemplateView):
template_name = 'home.html'
posts = Post.objects.all().order_by('-id')
def get_context_data(self, **kwargs):
context = super().get_context_data(**kwargs)
context = {
'carousel_posts': self.posts[:3],
}
return context
Use this make a for loop over the carouser_posts keyword in your template and extract the information you need.
<div class="carousel-inner">
{% for post in carousel_posts %}
<div class="carousel-item active">
<img src="{{post.image}}">
<p>{{post.title}}"</p>
</div>
{% endfor %}
</div>
UPDATE
Answer to your update. Using context keyword carousel_posts provided by our HomePageView we can access post objects one by one using for loop.
In template, assuming that your Post model has an image field called image.
{% for post in carousel_posts %}
<img src="{{ post.image.url }}">
{% endfor %}