我有一个Order
模型,它有一个origin
PointField和一个range
IntegerField。此外,还有一个UserProfile
模型,其中有一个geo_location
PointField。现在,我有一个User
实例,user
。我想选择所有Orders
,其中Order.origin
和user.userprofile.geo_location
之间的距离小于Order.range
模型字段中的值(米)。GeoDjango距离过滤器存储在模型中的距离值
如此反复,简化模型:
class Order(models.Model):
origin = models.PointField()
range = models.IntegerField(blank=True, default=10000)
class UserProfile(models.Model):
geo_location = models.PointField()
我已经得到了这个工作(传递距离静态):
>>> Order.objects.filter(origin__distance_lte=(user.profile.geo_location, D(m=3000)))
我的下一个(不成功)尝试是使用一个F()表达式使用Order.range
字段的值:
>>> Order.objects.filter(origin__distance_lte=(user.profile.geo_location, D(m=F('range'))))
Traceback (most recent call last):
File "<console>", line 1, in <module>
File "/Users/danger/devel/.virtualenvs/proj/lib/python2.7/site-packages/django/contrib/gis/measure.py", line 165, in __init__
self.m, self._default_unit = self.default_units(kwargs)
File "/Users/danger/devel/.virtualenvs/proj/lib/python2.7/site-packages/django/contrib/gis/measure.py", line 49, in default_units
if not isinstance(value, float): value = float(value)
TypeError: float() argument must be a string or a number
我认为问题在于D()不是懒惰地跑 - 我可以理解。 于是,我就只取原始值从range
场(整数),我应该工作,但是:
>>> Order.objects.filter(origin__distance_lte=(user.profile.geo_location, F('range')))
Traceback (most recent call last):
File "<console>", line 1, in <module>
File "/Users/danger/devel/.virtualenvs/proj/lib/python2.7/site-packages/django/db/models/query.py", line 69, in __repr__
data = list(self[:REPR_OUTPUT_SIZE + 1])
File "/Users/danger/devel/.virtualenvs/proj/lib/python2.7/site-packages/django/db/models/query.py", line 84, in __len__
self._result_cache.extend(self._iter)
File "/Users/danger/devel/.virtualenvs/proj/lib/python2.7/site-packages/django/db/models/query.py", line 273, in iterator
for row in compiler.results_iter():
File "/Users/danger/devel/.virtualenvs/proj/lib/python2.7/site-packages/django/db/models/sql/compiler.py", line 680, in results_iter
for rows in self.execute_sql(MULTI):
File "/Users/danger/devel/.virtualenvs/proj/lib/python2.7/site-packages/django/db/models/sql/compiler.py", line 725, in execute_sql
sql, params = self.as_sql()
File "/Users/danger/devel/.virtualenvs/proj/lib/python2.7/site-packages/django/db/models/sql/compiler.py", line 68, in as_sql
where, w_params = self.query.where.as_sql(qn=qn, connection=self.connection)
File "/Users/danger/devel/.virtualenvs/proj/lib/python2.7/site-packages/django/db/models/sql/where.py", line 92, in as_sql
sql, params = child.as_sql(qn=qn, connection=connection)
File "/Users/danger/devel/.virtualenvs/proj/lib/python2.7/site-packages/django/db/models/sql/where.py", line 95, in as_sql
sql, params = self.make_atom(child, qn, connection)
File "/Users/danger/devel/.virtualenvs/proj/lib/python2.7/site-packages/django/contrib/gis/db/models/sql/where.py", line 47, in make_atom
spatial_sql = connection.ops.spatial_lookup_sql(data, lookup_type, params_or_value, lvalue.field, qn)
File "/Users/danger/devel/.virtualenvs/proj/lib/python2.7/site-packages/django/contrib/gis/db/backends/postgis/operations.py", line 531, in spatial_lookup_sql
raise ValueError('Argument type should be %s, got %s instead.' % (arg_type, type(value[1])))
ValueError: Argument type should be (<class 'decimal.Decimal'>, <class 'django.contrib.gis.measure.Distance'>, <type 'float'>, <type 'int'>, <type 'long'>), got <class 'django.db.models.expressions.F'> instead.
那么,怎样才能做到我什么,我想?任何帮助表示赞赏!
谢谢你的努力把这个答案放在一起。最后,我最终得到了这里描述的解决方案:http://blog.adamfast.com/2011/11/radius-limited-searching-with-the-orm/ – 2012-03-21 16:14:27
感谢您的有用答案。但是,我发现ST_Distance()返回的是lon/lat度而不是米。以下是我所做的计量表: providers = providers.extra( 其中= ['ST_Distance(ST_Transform(origin,2163),ST_Transform(ST_PointFromText(%s,4326),2163))<= range'], params = [user.profile.geo_location.wkt] ) SRID 2163是美国的圆锥投影。我发现铸造也是不必要的。 – 2015-07-07 22:15:09
我相信'ST_Distance()'的工作方式会有所不同,具体取决于您是否给它“几何”对象或“地理”。 (自从我的原始答复以来,这可能会也可能没有改变。) – 2015-09-07 11:24:22