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POIn django-haystack, how can I use subclasses of models?
 

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    <p>I'm trying to get django-haystack (using a xapian backend) to index my model here for search, by the <code>name</code> and <code>description</code> fields.</p> <p>I have a subclass of <code>Item</code>, <code>Device</code>, which adds a <code>manufacturer</code> field.</p> <p>The <code>Item</code> model is defined thusly:</p> <pre><code>class Item(models.Model): name = models.CharField(max_length=255, unique=True) description = models.TextField(null=True, blank=True) compatible_with = models.ManyToManyField('self', null=True, blank=True) often_with = models.ManyToManyField('self', null=True, blank=True) created_by = models.ForeignKey(User, null=True, blank=True, related_name='created_by') verified = models.BooleanField(default=False) verified_by = models.ForeignKey(User, null=True, blank=True, related_name='verified_by') date_created = models.DateField(auto_now_add=True) slug = models.SlugField(max_length=300, null=True, blank=True) </code></pre> <p>My subclass of django-haystack’s <code>SearchIndex</code> looks like this:</p> <pre><code>class ItemIndex(SearchIndex): text = CharField(document=True, use_template=True) name = CharField(model_attr='name') description = CharField(model_attr='description') site.register(Item, ItemIndex) </code></pre> <p>I have set up this template, in <code>templates/search/indexes/catalog/item_text.txt</code>:</p> <pre><code>{{ object.name }} {{ object.description }} </code></pre> <p>What do I add to <code>item_text.txt</code> such that the <code>manufacturer</code> field gets indexed, if and only if the model object is an instance of <code>Device</code>?</p>
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