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我正在努力處理複雜的Django查詢,主要是因爲我試圖做一些可能很複雜的事情。geodjango foreignkey的距離
基本上,我得到這個:
models.py:
from django.contrib.gis.db import models
class Show(models.Model):
name = models.CharField()
class Venue(models.Models):
name = models.CharField()
coords = models.PointField()
objects = models.GeoManager()
class Representation(models.Model):
datetime = models.DateTimeField()
venue = models.ForeignKey(Venue)
show = models.ForeignKey(Show)
現在,我想要做的是,讓5所來電顯示,是貼近用戶(user.geoloc是一個點)。其中一件複雜的事情是,我的一些用戶可能住在沒有場地的地方,而我的解決方案就是,如果沒有足夠的場地,他們可以在更大的區域進行搜索。
view.py:
from django.contrib.gis.measure import D
DISTANCE_CLOSE = 1000 #arbitrary number
## this thing is not working, because it's not how it should be done
## but the logic is clearer in this
def get_nearest_shows_not_working(request):
list_shows = {}
while len(list_shows<5)
list_shows = Show.representation_set.filter(venue__coords__distance_lte=(user.geoloc, D(m=DISTANCE_CLOSE))).order_by('datetime'):[5]
DISTANCE_CLOSE = int(DISTANCE_CLOSE*1.2)
return render(request, 'template.html', locals())
def get_nearest_shows_ducktape(request):
list_shows = set()
while len(list_show) < 5:
list_rep = Representation.objects.filter(venue__coords__distance_lte=(user.geoloc, D(m=DISTANCE_CLOSE))).order_by('datetime')
for rep in list_rep:
list_shows.add(rep.show)
DISTANCE_CLOSE = int(DISTANCE_CLOSE*1.2)
list_shows = list_shows[:5]
return render(request, 'template.html', locals())
我缺少什麼?在Python中,應該是唯一正確的做事方式,在這裏,我只是搞亂了複雜的事情,這對我來說看起來並不矛盾。