几何在GEODJANGO中不存在

Question

我已经安装了Geodjango的所有依赖!现在我正在关注它的教程https://docs.djangoproject.com/en/1.2/ref/contrib/gis/tutorial/ - 问题:命令python manage.py syncdb生成错误atmpoly geometry(multipolygon 4326) not null that geometry does not exist

from django.contrib.gis.db import models

class WorldBorders(models.Model):
    # Regular Django fields corresponding to the attributes in the
    # world borders shapefile.
    name = models.CharField(max_length=50)
    area = models.IntegerField()
    pop2005 = models.IntegerField('Population 2005')
    fips = models.CharField('FIPS Code', max_length=2)
    iso2 = models.CharField('2 Digit ISO', max_length=2)
    iso3 = models.CharField('3 Digit ISO', max_length=3)
    un = models.IntegerField('United Nations Code')
    region = models.IntegerField('Region Code')
    subregion = models.IntegerField('Sub-Region Code')
    lon = models.FloatField()
    lat = models.FloatField()

    # GeoDjango-specific: a geometry field (MultiPolygonField), and
    # overriding the default manager with a GeoManager instance.
    mpoly = models.MultiPolygonField() //ERROR HERE

如何解决这个错误？

更新:

python manage.py sqlall world 生成以下输出:

BEGIN;
CREATE TABLE "world_worldborders" (
    "id" serial NOT NULL PRIMARY KEY,
    "name" varchar(50) NOT NULL,
    "area" integer NOT NULL,
    "pop2005" integer NOT NULL,
    "fips" varchar(2) NOT NULL,
    "iso2" varchar(2) NOT NULL,
    "iso3" varchar(3) NOT NULL,
    "un" integer NOT NULL,
    "region" integer NOT NULL,
    "subregion" integer NOT NULL,
    "lon" double precision NOT NULL,
    "lat" double precision NOT NULL,
    "mpoly" geometry(MULTIPOLYGON,4326) NOT NULL
)
;
CREATE INDEX "world_worldborders_mpoly_id" ON "world_worldborders" USING GIST ( "mpoly" );

COMMIT;

并python manage.py syncdb生成Program Error Geometry Doesn't exist::

root@cvp-linux:~/geodjango# python manage.py syncdb Syncing... Creating tables ... Creating table django_admin_log Creating table auth_permission Creating table auth_group_permissions Creating table auth_group Creating table auth_user_groups Creating table auth_user_user_permissions Creating table auth_user Creating table django_content_type Creating table django_session Creating table world_worldborders Traceback (most recent call last): File "manage.py", line 10, in <module> execute_from_command_line(sys.argv) File "/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py", line 399, in execute_from_command_line utility.execute() File "/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py", line 392, in execute self.fetch_command(subcommand).run_from_argv(self.argv) File "/usr/local/lib/python2.7/dist-packages/django/core/management/base.py", line 242, in run_from_argv self.execute(*args, **options.__dict__) File "/usr/local/lib/python2.7/dist-packages/django/core/management/base.py", line 285, in execute output = self.handle(*args, **options) File "/usr/local/lib/python2.7/dist-packages/django/core/management/base.py", line 415, in handle return self.handle_noargs(**options) File "/usr/local/lib/python2.7/dist-packages/south/management/commands/syncdb.py", line 92, in handle_noargs syncdb.Command().execute(**options) File "/usr/local/lib/python2.7/dist-packages/django/core/management/base.py", line 285, in execute output = self.handle(*args, **options) File "/usr/local/lib/python2.7/dist-packages/django/core/management/base.py", line 415, in handle return self.handle_noargs(**options) File "/usr/local/lib/python2.7/dist-packages/django/core/management/commands/syncdb.py", line 107, in handle_noargs cursor.execute(statement) File "/usr/local/lib/python2.7/dist-packages/django/db/backends/util.py", line 69, in execute return super(CursorDebugWrapper, self).execute(sql, params) File "/usr/local/lib/python2.7/dist-packages/django/db/backends/util.py", line 53, in execute return self.cursor.execute(sql, params) File "/usr/local/lib/python2.7/dist-packages/django/db/utils.py", line 99, in __exit__ six.reraise(dj_exc_type, dj_exc_value, traceback) File "/usr/local/lib/python2.7/dist-packages/django/db/backends/util.py", line 51, in execute return self.cursor.execute(sql) django.db.utils.ProgrammingError: type "geometry" does not exist LINE 14: "mpoly" geometry(MULTIPOLYGON,4326) NOT NULL

Answer 1

要检查的几件事:

• 你跑了 CREATE EXTENSION postgis;
• GEOS_LIBRARY_PATH在项目的settings.py文件中设置

第二点给了我一些麻烦,虽然它是第一个最终完成这个技巧的.我在Cygwin 64位上运行它,所以还有一些额外的工作要做才能使它工作.如果您没有在Cygwin环境中运行,那么您所寻找的文件很可能是libgeos_c.so; 我需要将它指向cyggeos_c-1.dll(仍在Windows上运行,因此.dll扩展名是我需要找到的).

我很肯定我已经运行了CREATE EXTENSION命令,但我可能没有在Cygwin环境中运行它.或者我曾经尝试过,但是没记得我有一个配置的噩梦,使得postgres服务器没有在localhost上运行,所以我避免使用psql.这是我自己的厚度品牌.