I have the following model.

class Location(models.Model):
    name = models.CharField(max_length = 128, blank = True)
    address =models.CharField(max_length = 200, blank= True)
    latitude = models.DecimalField(max_digits=6, decimal_places=3)
    longitude = models.DecimalField(max_digits=6, decimal_places=3)

    def __unicode__(self):
        return self.name

If my current latitude & longitude is:

current_lat = 43.648
current_long = 79.404

I did some research and came across the Haversine Equation which calculates the distance between two location coordinates. Below is the equation I found:

import math

def distance(origin, destination):
    lat1, lon1 = origin
    lat2, lon2 = destination
    radius = 6371 # km

    dlat = math.radians(lat2-lat1)
    dlon = math.radians(lon2-lon1)
    a = math.sin(dlat/2) * math.sin(dlat/2) + math.cos(math.radians(lat1)) \
        * math.cos(math.radians(lat2)) * math.sin(dlon/2) * math.sin(dlon/2)
    c = 2 * math.atan2(math.sqrt(a), math.sqrt(1-a))
    d = radius * c

    return d

I would like to return all the Location objects that fall within a 10 km radius, how can I filter it in such a way that it will only return all the Location objects that fall within this 10 km radius?

LocationsNearMe = Location.objects.filter(#This is where I am stuck)

Is there anyway I can implement the Haversine equation into the filtering so that it only returns the location objects that fall within a 10 km radius?

I'm looking for a well detailed answer. Appreciate the help.

python django haversine
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