使用 GeoDjango 模型作为抽象类
我正在玩 GeoDjango 并且有一些疑问。我将非常感谢任何意见和建议。
这是我的问题。首先,我定义了这个(抽象)类:
from django.contrib.gis.db import models
from django.contrib.gis.geos import *
class LocatableModel(models.Model):
country = models.CharField(max_length=48, blank=True)
country_code = models.CharField(max_length=2, blank=True)
locality = models.CharField(max_length=48, blank=True)
sub_locality = models.CharField(max_length=48, blank=True)
street = models.CharField(max_length=48, blank=True)
address = models.CharField(max_length=120, blank=True)
point = models.PointField(null=True)
objects = models.GeoManager()
class Meta:
abstract = True
其次,我定义了另一个“实体”类,它 代表与我的网站相关的个人或组织:
from django.db import models
class Entity(models.Model):
name = models.CharField(max_length=64)
slug = models.SlugField(max_length=64, unique=True)
website = models.URLField(verify_exists=False, blank=True)
email = models.EmailField(blank=True)
...
最后,我从以前的类中创建了一个类:
import LocatableModel
import Entity
class Organization(Entity, LocatableModel):
timetable = models.CharField(max_length=64)
...
在我看来,我想找到靠近特定点的组织:
from django.contrib.gis.geos import Point
from django.contrib.gis.measure import D
def index(request):
pnt = Point(12.4604, 43.9420)
dic = { 'orgs': Organization.objects.filter(point__distance__lte=(pnt, D(km=7))) }
return render_to_response('index.html', dic)
但我收到错误:
“加入字段'您是否将“距离”拼错了? 查找类型?”
我想我把模型的“对象”属性弄乱了,但我不确定。有什么想法吗? 提前致谢。
I'm playing with GeoDjango and have some doubts. I'll really appreciate any comment and suggestion.
This is my problem. First, I've defined this (abstract) class:
from django.contrib.gis.db import models
from django.contrib.gis.geos import *
class LocatableModel(models.Model):
country = models.CharField(max_length=48, blank=True)
country_code = models.CharField(max_length=2, blank=True)
locality = models.CharField(max_length=48, blank=True)
sub_locality = models.CharField(max_length=48, blank=True)
street = models.CharField(max_length=48, blank=True)
address = models.CharField(max_length=120, blank=True)
point = models.PointField(null=True)
objects = models.GeoManager()
class Meta:
abstract = True
Second, I've defined this other 'Entity' class, which
represents a person or organization related to my site:
from django.db import models
class Entity(models.Model):
name = models.CharField(max_length=64)
slug = models.SlugField(max_length=64, unique=True)
website = models.URLField(verify_exists=False, blank=True)
email = models.EmailField(blank=True)
...
Finally, I've created a class from the previous ones:
import LocatableModel
import Entity
class Organization(Entity, LocatableModel):
timetable = models.CharField(max_length=64)
...
In my views, I'd like to find organizations near a specific point:
from django.contrib.gis.geos import Point
from django.contrib.gis.measure import D
def index(request):
pnt = Point(12.4604, 43.9420)
dic = { 'orgs': Organization.objects.filter(point__distance__lte=(pnt, D(km=7))) }
return render_to_response('index.html', dic)
But I receive the error:
"Join on field 'point' not permitted. Did you misspell 'distance' for
the lookup type?"
I think I'm doing a mess with the model 'objects' property, but I'm not sure. Any ideas?
Thanks in advance.
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这个错误以前曾出现过,并声称在 3 年前的这张票中已得到解决:
https://code。 djangoproject.com/ticket/9364
当我遇到同样的问题时,我在票证中注意到查询管理器在继承的模型中被显式设置为 GeoManager。因此,添加一行,例如
...可能会解决您所看到的问题,它对我有用。
This error has been seen before, and claimed to be solved in this ticket 3 years ago:
https://code.djangoproject.com/ticket/9364
When I ran into this same problem, I noticed in the ticket that the query manager was set explicitly to GeoManager in the inherited model(s). So adding a line like,
...may solve the issue you're seeing, it worked for me.