Django loop through a list of objects in template

Question

I'm trying to store the results from a query in a list or similar (trying different alternatives), but the one I have got the furthest with is:

def index(request):
for post in blog_posts:
        comments_total.setdefault(post.id, []).append(comments.total(post.id))
return render_to_response('blog/index.html', {
'comments': comments_total})

In the return-data I get: {5L: [2], 6L: [1]}

I'm using this code to access:

{% if comments %}
{{comments}}<br />
{% for cid in comments %}
{% if cid == post.id %}
{{cid}} - {{comments.cid.0}}<br />
{{cid}} - {{comments.6.0}}
{% endif %}
{% endfor %}
{% endif %}

What it prints out in whole is:

{5L: [2], 6L: [1]} 5 - 5 - 1

Is there an alternative for how to get all comments for, in this case, a blog, count through the results for each post and return it to the template?

What I'm trying to do is to get a counter for the start-page of a blog. "You have (X) comments on this post"-kind of thing.

Are you using any particular module for your commenting system? Some of them (like Disqus) have built in functions for returning information like this. — woemler
– woemler, Commented Jan 10, 2013 at 20:31
No extra modules. The only module I have is the custom I made for comments and posts, which is fairly simple "load it neatly into the database". — Richard Atterfalk
– Richard Atterfalk, Commented Jan 10, 2013 at 22:15

Aamir Rind · Accepted Answer · 2013-01-10 22:26:09Z

2

You can do this is in more efficient way "showing counts of comments for each post"

Lets say you have two models Post and Comment. Just define a related_name to the post ForeignKey relationship in Comment model:

class Comment(models.Model):
    post = models.ForeignKey(Post, related_name='comments')
    # other fields

Then in template you can do:

{% for post in posts %}
    {{post.comments.count}}
{% endfor %}

answered Jan 10, 2013 at 22:26

Aamir Rind

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2 Comments

Richard Atterfalk Over a year ago

I did try this, but it didn't work out. Gives me an "UnboundLocalError" because "comments" was referenced before assignment. Is the related_name taken from any variable which I might have in the model, or just out of the blue?

Aamir Rind Over a year ago

Is the error came from model? If yes you might have missed single quotes it should be related_name='comments'. No related_name is not taken from any variable, it just defined directly there as a string

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