How to filter a django model with latitude and longitude coordinates that fall within a certain radius

Question

I have the following model.

class Location(models.Model):
    name = models.CharField(max_length = 128, blank = True)
    address =models.CharField(max_length =          


        

Answer 1

But you can always make proposed by Brian approach better by filtering the results from previous step (which hoepfully should be smaller subset) and for each you check either they are within the radius.

Your user is in black point. Square approximation given by Brian return green but also orange points. The divernce in distance can be significant in worst case user have to go sqrt(2) times further than expected (extra 40% of distance). So for all orange and green points it is worth to check if their distance from black point (e.g euclidian one if this are really short distances e.g navigation in city) is not greater than assumed radius.

UPDATE:

If you would like to use Haversine distance or (better) mentioned GeoDjango hava a look on this snippet comparing two django views dealing with nearby search:

https://gist.github.com/andilabs/4232b463e5ad2f19c155