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POAnnotate in Django with generic relations
 

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  1. POAnnotate in Django with generic relations
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    <p>I am using <a href="http://blog.damontimm.com/django-hitcount-app-count-hits-views/" rel="nofollow">django-hitcount</a> to tally hits to my database objects. I want to count the hits by object to determine which object has the most hits in a given time range. The app has two models of interest here:</p> <pre><code>class Hit(models.Model): created = models.DateTimeField(editable=False) ip = models.CharField(max_length=40, editable=False) session = models.CharField(max_length=40, editable=False) user_agent = models.CharField(max_length=255, editable=False) user = models.ForeignKey(User,null=True, editable=False) hitcount = models.ForeignKey(HitCount, editable=False) class HitCount(models.Model): hits = models.PositiveIntegerField(default=0) modified = models.DateTimeField(default=datetime.datetime.utcnow) content_type = models.ForeignKey(ContentType, verbose_name="content cype", related_name="content_type_set_for_%(class)s",) object_pk = models.TextField('object ID') content_object = generic.GenericForeignKey('content_type', 'object_pk') </code></pre> <p>"Hit" logs each hit with a timestamp while HitCount stores overall number of hits. To get the hits by object and within a time range, I need to do the following:</p> <p>Filter Hit by date created Count number of hits per content_object (within time range filtered above) order by count calculated above return content_object and count</p> <p>This could be very expensive, so I planned on calcing/caching once per day.</p> <p>As a first step, I wanted to count the number of hits per content_object irrespective of time range.</p> <pre><code>limited_hc = Hit.objects.all().values('hitcount__content_object').annotate(count = Count('hitcount__object_pk')) </code></pre> <p>I immediately run into an issue:</p> <p>Cannot resolve keyword 'hitcount__content_object' into field. Choices are: created, hitcount, id, ip, session, user, user_agent</p> <p>After some digging, I found that <a href="http://code.djangoproject.com/ticket/10461" rel="nofollow">annotation and generic relations do not work well together</a>. If I use object_pk instead of content_object, it works fine, but then I don't have the name of the object.</p> <p>So my question: <strong>What is an alternative to achieve the same result? How can group by object but also retain the name?</strong></p> <p>I do have the model (content_type) and the id (object_pk), so I could always pull these separately, but that seems inelegant. . . </p>
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    1. CONo possibility to try that right now, but have you tried `limited_hc = Hit.objects.all().values('hitcount__content_type', 'hitcount__object_pk').annotate(count = Count('hitcount__object_pk'))`?
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    2. COThat works, but I'm not getting the link to the actual object. So I can't get the name, only the pk. I'd then have to ping the database again to pull the name data from the respective table
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