Created
August 18, 2012 07:34
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Simple Geo model for Django
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from geopy import units, distance | |
from mezzanine.core.managers import CurrentSiteManager | |
class GeoManager(CurrentSiteManager): | |
def near(self, latitude=None, longitude=None, distance_range=30): | |
queryset = super(GeoManager, self).get_query_set() | |
if not (latitude and longitude and distance_range): | |
return queryset.none() | |
latitude = float(latitude) | |
longitude = float(longitude) | |
distance_range = float(distance_range) | |
rough_distance = units.degrees(arcminutes=units.nautical(kilometers=distance_range)) * 2 | |
queryset = queryset.filter( | |
latitude__range=( | |
latitude - rough_distance, | |
latitude + rough_distance | |
), | |
longitude__range=( | |
longitude - rough_distance, | |
longitude + rough_distance | |
) | |
) | |
locations = [] | |
for location in queryset: | |
if location.latitude and location.longitude: | |
exact_distance = distance.distance( | |
(latitude, longitude), | |
(location.latitude, location.longitude) | |
).kilometers | |
if exact_distance <= distance_range: | |
locations.append(location) | |
queryset = queryset.filter(id__in=[l.id for l in locations]) | |
return queryset |
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from geopy import geocoders | |
from geopy.geocoders.google import GQueryError | |
class BaseGeo(models.Model): | |
location = models.TextField(_('Address'), blank=True) | |
latitude = models.FloatField(_('Latitude'), blank=True, null=True) | |
longitude = models.FloatField(_('Longitude'), blank=True, null=True) | |
place = models.TextField(_('Place'), blank=True) | |
objects = GeoManager() | |
class Meta: | |
abstract = True | |
def save(self, domain='maps.google.com.my', *args, **kwargs): | |
location = self.location | |
if location: | |
if not self.latitude or not self.longitude: | |
try: | |
g = geocoders.Google(domain=domain) | |
self.place, (self.latitude, self.longitude) = g.geocode(location) | |
except GQueryError: | |
pass | |
except Exception, e: | |
print '%s' % e | |
super(BaseGeo, self).save(*args, **kwargs) |
Good solution, thanks for sharing !!
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@renyi Thanks for this gist, I needed to implement functionality to find nearby places to a user's address (with latitude/longitude being known for all the places and also the user's address) and this example was very useful!
In my case I wasn't using Mezzanine or anything like that, but I did end up implementing this functionality as a
nearby()
function on my Place model manager, allowing me to donearby_places = Place.objects.nearby(latitude=address.latitude, longitude=address.longitude)
.