django point definition

问题

my models:

class Mod(models.model)
    name = models.CharField(max_length = 255)
    co_x = models.DecimalField(max_digits = 11, decimal_places = 8)
    co_y = models.DecimalField(max_digits = 11, decimal_places = 8)

my views:

def closedPoint(request):
    location_name = str(request.POST.get("lo", default=""))
    nokta_x = int(float(request.POST.get("x"))
    nokta_y = int(float(request.POST.get("y"))
    poi = Point(nokta_x, nokta_y, srid = 900913)

    sk = Mod()
    poi_s = Point(sk.co_x, co_y, srid = 900913)

    resut_poi = Mod.objects.filter(poi_s__distance_lte = (poi, D(km = 7))).filter(name__in = location_name)

here i want to deduct closest point in 7 km but it gives "Invalid parameters given for Point initialization

回答1:

Ok, so it's now clear your error message comes from initializing a Point class with None.

That is your first critical problem.

Judging by the error message, my guess is that poi_s is initialized with None, None as Mod() is an unsaved instance with no values and those are the invalid parameters.

sk = Mod() # unsaved Mod instance with no defaults
poi_s = Point(sk.co_x, co_y, srid = 900913)
# sk.co_x is None

Your second problem that will appear after fixing the above is querying a model with an invalid lookup type (specific to PointField, __distance) which accepts a tuple. How to solve that, I don't know.

You would have to look at how GeoDjango translates that tuple into a DB lookup.

来源：https://stackoverflow.com/questions/5327684/django-point-definition

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python

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geodjango