How to display items in a sorted order? - django-templates

Question

I have this in my template file:
{% get_latest_show as slideshow %}
{% for slide in slideshow.slide_set.all %}
<img src="{% thumbnail slide.image 1174x640 upscale %}" alt="{{slide.title}}" width="1174"/>
{% endfor %}
models.py
from django.db import models
import datetime
class Slide(models.Model):
title = models.CharField(max_length=50)
description = models.TextField(blank=True, null=True)
target_url = models.TextField(blank=True, null=True)
slideshow = models.ForeignKey('Slideshow')
image = models.ImageField(upload_to='slideshow', max_length=500, blank=True,null=True)
def __unicode__(self):
return self.title
class Slideshow(models.Model):
title = models.CharField(max_length=50)
pub_date = models.DateTimeField(auto_now=True)
published = models.BooleanField(default=False)
class Meta:
ordering = ['-title']
def __unicode__(self):
return self.title
slide_tags.py
from django import template
from django.core.cache import cache
from django.contrib.contenttypes.models import ContentType
from slides.models import Slide, Slideshow
register = template.Library()
class GetSlideshowNode(template.Node):
"""
Retrieves the latest published slideshow
"""
def __init__(self, varname):
self.varname = varname
def render(self, context):
try:
show = Slideshow.objects.filter(published=True)[0]
except:
show = []
context[self.varname] = show
return ''
def get_latest_show(parser, token):
"""
Retrieves the latest published slideshow
{% get_latest_show as show %}
"""
args = token.split_contents()
argc = len(args)
try:
assert (argc == 3 and args[1] == 'as')
except AssertionError:
raise template.TemplateSyntaxError('get_latest_show syntax: {% get_latest_show as varname %}')
varname = None
t, a, varname = args
return GetSlideshowNode(varname=varname)
register.tag(get_latest_show)
The problem is that my slides are being displayed out of order. When I print slideshow.slide.set.all on the page, I see:
[<Slide: Slide 2>, <Slide: Slide 3>, <Slide: Slide 4>, <Slide: Slide 1>]
How do I get the slides to appear in order?

Answer 1

You want the slide_set to be ordered therefor the 'ordering' statement should be on the Slide model.
class Slide(models.Model):
# fields
class Meta:
ordering = ['-title']
This will cause Slide.objects.all() to return a queryset ordered by the title field. That is equivalent to slideshow.slide_set.all()