CODEWITHSUNDEEP
djangodjango-haystackgeodjango
Cartucho
Cartucho

Reputation: 3319

How to use GeoDjango with Haystack?

I'm trying to use Django (1.5.1) and Haystack (2.0.1) for searching objects that include geolocation information:

from django.contrib.gis.db import models as geomodels

class GeoModel(geomodels.Model):
    geo_point = geomodels.PointField()
    # Geographic Locator manager
    objects = geomodels.GeoManager()
    ...

I need to filter based on the geolocation. The following query works, basically because GeoModel is using a geomodels.GeoManager:

from django.contrib.gis.measure import D
from django.contrib.gis.geos import Point
...

center = Point(lat, lng)
radius = D(km=100)
GeoModel.objects.all().filter(geo_point__distance_lte=(center, radius))

The problem is when I try to use Haystack to filter results based on its geolocation. I made a subclass of SearchView:

 from haystack.views import SearchView
 ...

 class MySearchView(SearchView):

    def get_results(self):
        center = Point(lat, lng)
        radius = D(km=100)
        results = super(MySearchView, self).get_results()  # << OK, get all results 
        return results.filter(geo_point__distance_lte=(center, radius))  # << WRONG, no results

So, how can I customize Haystack views/form to filter results based on a specific location? Thanks in advance.

Upvotes: 0

Views: 638

Answers (1)

Joey Wilhelm
Joey Wilhelm

Reputation: 5819

I'm using a very similar setup (Django 1.5.4, Haystack 2.0.0, Elasticsearch 0.90.0) and this is what I've got:

from haystack.utils.geo import D, Point
from haystack.views import SearchView

class MySearchView(SearchView):
    results = super(MySearchView, self).get_results()
    ...
    lng = -112.0739
    lat = 33.4492
    center = Point(lng, lat)
    radius = D(mi=50)
    results = results.dwithin('geo_point', center, radius)
    ...
    return results

An important thing to keep in mind as well is the backend. According to the Haystack backend support matrix (http://django-haystack.readthedocs.org/en/latest/backend_support.html#backend-support-matrix) only Solr and Elasticsearch support spatial data.

Upvotes: 1

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