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Editorial Team
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Asked: 2026-05-31T08:04:01+00:00

I’m trying to create a Django query that will do the equivalent of the

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I’m trying to create a Django query that will do the equivalent of the following PostgreSQL/PostGIS query:

SELECT DISTINCT ON (site) * FROM some_table;

site is a POINT type geometry column. How can this be done?

Basically, many of the records in some_table share the same POINT geometry; I just want a list of the geometries with no duplicates. I don’t care about the rest of the some_table columns.

The rest of my query is pretty simple; it looks something like this:

qs = models.SomeTable.objects.filter(foo='bar', site__contained=some_polygon)

Side note:

The ‘manager’ for SomeTable (SomeTable.objects) is a django.contrib.gis.db.models.GeoManger type. I don’t know if that helps at all.

Relevant version info:

  • Django 1.3
  • PostgreSQL 9.1.1
  • PostGIS 1.5.3
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1 Answer

  1. Editorial Team

    I figured it out. I had overlooked distinct: https://docs.djangoproject.com/en/dev/ref/models/querysets/#django.db.models.query.QuerySet.distinct

    Here’s the django query that does exactly what I need:

    qs = models.SomeTable.objects.filter(foo='bar', site__contained=some_polygon).values('site').distinct()
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