1

我正在使用 Django 和 PostGIS 来搜索距离某个点有一定距离的用户。抽象代码在这里：

class User(AbstractUser):
    geo = PointField(null=True, srid=4326)
    objects = GeoManager()

然后在 shell 中运行：

u = User.objects.first()
p = Point(39.9167,116.3833, srid=4326)
u.geo = p
u.save()
User.objects.filter(geo_address__distance_lte=(p, D(km=5)))

但得到这样的错误：

...


/usr/local/lib/python2.7/site-packages/django/contrib/gis/db/models/fields.pyc in geodetic(self, connection)
    170         system that uses non-projected units (e.g., latitude/longitude).
    171         """
--> 172         return self.units_name(connection).lower() in self.geodetic_units
    173
    174     def get_distance(self, value, lookup_type, connection):

/usr/local/lib/python2.7/site-packages/django/contrib/gis/db/models/fields.pyc in units_name(self, connection)
    161     def units_name(self, connection):
    162         if not hasattr(self, '_units_name'):
--> 163             self._get_srid_info(connection)
    164         return self._units_name
    165

/usr/local/lib/python2.7/site-packages/django/contrib/gis/db/models/fields.pyc in _get_srid_info(self, connection)
    147     def _get_srid_info(self, connection):
    148         # Get attributes from `get_srid_info`.
--> 149         self._units, self._units_name, self._spheroid = get_srid_info(self.srid, connection)
    150
    151     def spheroid(self, connection):

/usr/local/lib/python2.7/site-packages/django/contrib/gis/db/models/fields.pyc in get_srid_info(srid, connection)
     35     if srid not in _srid_cache[connection.alias]:
     36         # Use `SpatialRefSys` model to query for spatial reference info.
---> 37         sr = SpatialRefSys.objects.using(connection.alias).get(srid=srid)
     38         units, units_name = sr.units
     39         spheroid = SpatialRefSys.get_spheroid(sr.wkt)

/usr/local/lib/python2.7/site-packages/django/db/models/query.pyc in get(self, *args, **kwargs)
    332             raise self.model.DoesNotExist(
    333                 "%s matching query does not exist." %
--> 334                 self.model._meta.object_name
    335             )
    336         raise self.model.MultipleObjectsReturned(

DoesNotExist: PostGISSpatialRefSys matching query does not exist.
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1 回答 1

0

最后我发现这是因为我没有按照我的意图从一个创建良好的空间数据库模板创建我的数据库。所以为了解决这个问题，我用 spatial_ref_sys.sql 更新了模板数据库：

psql -d template_postgis -f /path/to/spatial_ref_sys.sql

然后从以下位置重新创建我的数据库template_postgis：

createdb my_db -T template_postgis

现在一切正常。

于 2016-04-20T10:47:34.817 回答