Preparing data using a model attribute that is a manager

LaundroMat

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Jun 11, 2010, 4:39:43 AM6/11/10

to django-haystack

Hi -

I'm trying to use django-taggit with haystack, and I've run into the
following problem:
From the documentation (http://docs.haystacksearch.org/dev/
searchindex_api.html#prepare-self-object) I got this:

def prepare(self, object):
self.prepared_data = super(ItemIndex, self).prepare(object)
# Add in tags (assuming there's a M2M relationship to Tag on the
model).
# Note that this would NOT get picked up by the automatic
# schema tools provided by Haystack.
self.prepared_data['tags'] = [tag.name for tag in object.tags.all()]

But, the relation in the model for tags is not an M2M relation.
Instead, the attribute tags is an instance of
taggit.TaggableManager(). This way, rebuilding the index does not
work, because the attribute "tags" is not found...

Thanks in advance for any help you might be able to give,

Mathieu

LaundroMat

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Jun 11, 2010, 11:07:01 AM6/11/10

to django-haystack

Just to inform you of further progress:

I was initially using django-tagging instead of django-taggit. I
thought that taggit's approach (where "tags" is a model attribute)
would facilitate integration with haystack. I have now switched back
to django-tagging, but the question more or less remains the same.

My prepare method now looks like this:

def prepare(self, object): # See
http://docs.haystacksearch.org/dev/searchindex_api.html#prepare-self-object
self.prepared_data = super(ItemIndex, self).prepare(object)

self.prepared_data['tags'] = " ".join([tag.name for tag in
Tag.objects.get_for_object(object)])

And it seems I'm having no problems rebuilding the index anymore. Now
I'm off to experiment with filtering and such :)

Daniel Lindsley

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Jun 15, 2010, 2:02:10 AM6/15/10

to django-...@googlegroups.com

LaundroMat,

Obviously, seeing more of your code would help. I've successfully
used taggit with Haystack several times. All your ought to need to do
is something like:

======
class EntrySearchIndex(indexes.SearchIndex):
text = indexes.CharField(document=True, use_template=True)
# Your fields here, then...
tags = indexes.MultiValueField()

def prepare_tags(self, obj):
return [tag.name for tag in obj.tags.all()]
====

You don't need to use the ``prepare`` override in this case,
because you already have a ``tags`` field and because you don't need
to access the prepared results of more than one field.

Daniel

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