How do I get the previous and next post on my Django blog?
I know Django has get_previous_by_FOO and get_next_by_FOO methods, but I don't know how to use them in my templates and views. So please help me make these two methods for my project.
I run Django1.7
and Python2.7
, and my application name is blog
here are my corresponding files:
Blog /views.py
def view_post(request, slug):
post = get_object_or_404(Post, slug=slug)
return render_to_response('blog/blog_post.html',
{
'post':post,
},
context_instance=RequestContext(request))
class PublishedPostMixin(object):
def get_queryset(self):
return self.model.objects.live()
class PostDetailView(PublishedPostMixin,DetailView):
model = Post
Blog /models.py
class Post(models.Model):
created_at = models.DateTimeField(auto_now_add=True, editable=False)
updated_at = models.DateTimeField(auto_now=True, editable=False)
title = models.CharField(max_length=255)
slug = models.SlugField(max_length=255,unique=True)
content = MarkdownField()
published = models.BooleanField(default=True)
author = models.ForeignKey(User, related_name="posts")
tags = models.ManyToManyField(Tag)
class Meta:
ordering = ["-created_at", "title"]
def __unicode__(self):
return self.title
def save(self, *args, ** kwargs):
if not self.slug:
self.slug = slugify(self.title) #title become the slug
super(Post, self).save(*args,**kwargs)
@models.permalink
def get_absolute_url(self):
return ("blog:detail",(),{'slug':self.slug
})
Blog /urls.py
urlpatterns = patterns('',
url(r"^(?P<slug>[\w-]+)/$",view_post, name="detail"),
)
Templates
<p>
{{ post.content|markdown }}
</p>
<ul class="pager">
<li class="previous">
<a href="{{post.get_previous_by_created_at}}">← Previous Posts</a>
</li>
<li class="next">
<a href="{{post.get_next_by_created_at}}">Next Posts →</a>
</li>
</ul>
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1 answer
Finally, I solved it by just introducing url tag in templates. Here is my modified template.
{% load url from future %}
<ul class="pager">
{% if post.get_next_by_created_at %}
<li class="previous">
<a href="{% url 'blog:detail' post.get_next_by_created_at.slug %}">← Previous Post</a>
</li>
{% endif %}
{% if post.get_previous_by_created_at %}
<li class="next">
<a href="{% url 'blog:detail' post.get_previous_by_created_at.slug %}">Next Post →</a>
</li>
{% endif %}
</ul>
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