Django-Haystack - How to use Haystack with django-comments? - django-haystack

Question

I'm struggling with Django-Haystack.
I need to do an Index that have Articles and Comment articles. My doubt is how can I put in a document based index the Articles and the Comments.
How can I search for keywords in the comments and in the articles and output the article with that keywords(article comments, article)?
It is possible?
Best Regards,

Answer 1

The first thing to do is forget the notion that a SearchIndex must correspond exactly to a model. It's only sourced from one.
The simplest way to do this would be to add the comments to the indexed document using a template. This presume your Article model as a title field:
class ArticleIndex(SearchIndex, indexes.Indexable):
text = CharField(document=True, use_template=True)
title = CharField(model_attr='title')
def get_model(self):
return Article
Note the keyword argument use_template is set to true. The default value for this is search/indexes/{app_label}/{model_name}_{field_name}.txt. In that template just output the content you want to index. E.g.
{{ object.title|safe }}
{{ object.body|safe }}
{% for comment in object.comments.all %}
{{ comment|safe }}
{% endfor %}
While I'm afraid the specific reverse relation name here is probably wrong, that's the gist of what you want to do. Again, this is a simple way of accomplishing what you've specifically stated.

Answer 2

This is what worked for me:
In your models.py, presuming comments are attached to an Article, you want a method that returns comments attached to it (there is no easy way to do this):
class Article:
def comments(self):
ids = [self.id]
ctype = ContentType.objects.get_for_model(Article)
comments = Comment.objects.filter(content_type=ctype,
object_pk__in=ids,
is_removed=False)
return comments
In your search_indexes.py, make sure the ArticleIndex has use_template=True:
from django.contrib.contenttypes.models import ContentType
from django.contrib.comments.models import Comment
class ArticleIndex(SearchIndex):
text = CharField(use_template=True)
In your index template, e.g. templates/search/indexes/article_text.txt:
{% for comment in object.comments.all %}
{{ comment }}
{% endfor %}
Now, the only remaining problem is to update that specific index object when a comment is added or removed. Here we use signals:
In your models.py:
from django.dispatch import receiver
from haystack import site
from django.contrib.comments.signals import (comment_was_posted,
comment_was_flagged)
#receiver(comment_was_posted)
def comment_posted(sender, **kwargs):
site.get_index(Article).update_object(kwargs['comment'].content_object)
#receiver(comment_was_flagged)
def comment_flagged(sender, **kwargs):
site.get_index(Article).update_object(kwargs['comment'].content_object)