dynamic_fields.py

from haystack import indexes


# The easiest, per-object approach.
class CustomSearchIndex(indexes.SearchIndex, indexes.Indexable):
    # The usual fields.

    def prepare(self, obj):
        prepared = super(CustomSearchIndex, self).prepare(obj)

        # Assuming there's a relation...
        for tag_set in obj.tag_sets.filter(is_official=True):
            tags = [tag.name for tag in tag_set.tags.all()]
            prepared["%s_tagset" % tag_set.name] = tags
            prepared["%s__exact_tagset" % tag_set.name] = tags

        return prepared


# In the solr.xml, add:
<dynamicField name="*_tagset"  type="string"  indexed="true"  stored="true"  multiValued="true" />

<daniellindsley> The part I'm unsure about is the faceting. You may need more than one dynamic field type.
<daniellindsley> Would be just changing the suffix on the key in ``prepare`` dict & adding another field to ``solr.xml`` like the one shown.
<ghing> daniellindsley: ok.  thank you very much
<daniellindsley> You'll probably have to play with it a bit, but that's the general approach I'd take.
<ghing> ok cool.
<daniellindsley> It's possible to put new fields on the index (typically in ``__init__``, doing things like ``self.fields['new_fieldname'] = indexes.CharField(...)``) but that's not typically per-object.