无法使用以下类型的值设置 MODEL_NAME SpatialProxy (POLYGON):<class 'django.contrib.gis.geos.polygon.Polygon'> [英] Cannot set MODEL_NAME SpatialProxy (POLYGON) with value of type: <class 'django.contrib.gis.geos.polygon.Polygon'>
问题描述
当我尝试对我的模型的 URL 进行 API 调用时,我面临以下情况:
When I try an API call to the url of one my models I face the following:
Cannot set Allotment SpatialProxy (POLYGON) with value of type: <class 'django.contrib.gis.geos.polygon.Polygon'>
我在 PGadmin 中检查了模型的定义和数据类型.
I check my model's definition and data type in PGadmin.
完整日志
Traceback:
File "/home/user/MyProjects/forest-venv/lib/python3.5/site-packages/django/core/handlers/exception.py" in inner
35. response = get_response(request)
File "/home/user/MyProjects/forest-venv/lib/python3.5/site-packages/django/core/handlers/base.py" in _get_response
128. response = self.process_exception_by_middleware(e, request)
File "/home/user/MyProjects/forest-venv/lib/python3.5/site-packages/django/core/handlers/base.py" in _get_response
126. response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/home/user/MyProjects/forest-venv/lib/python3.5/site-packages/django/views/decorators/csrf.py" in wrapped_view
54. return view_func(*args, **kwargs)
File "/home/user/MyProjects/forest-venv/lib/python3.5/site-packages/rest_framework/viewsets.py" in view
103. return self.dispatch(request, *args, **kwargs)
File "/home/user/MyProjects/forest-venv/lib/python3.5/site-packages/rest_framework/views.py" in dispatch
483. response = self.handle_exception(exc)
File "/home/user/MyProjects/forest-venv/lib/python3.5/site-packages/rest_framework/views.py" in handle_exception
443. self.raise_uncaught_exception(exc)
File "/home/user/MyProjects/forest-venv/lib/python3.5/site-packages/rest_framework/views.py" in dispatch
480. response = handler(request, *args, **kwargs)
File "/home/user/MyProjects/forest-venv/lib/python3.5/site-packages/rest_framework/mixins.py" in list
42. page = self.paginate_queryset(queryset)
File "/home/user/MyProjects/forest-venv/lib/python3.5/site-packages/rest_framework/generics.py" in paginate_queryset
173. return self.paginator.paginate_queryset(queryset, self.request, view=self)
File "/home/user/MyProjects/forest-venv/lib/python3.5/site-packages/rest_framework/pagination.py" in paginate_queryset
337. return list(queryset[self.offset:self.offset + self.limit])
File "/home/user/MyProjects/forest-venv/lib/python3.5/site-packages/django/db/models/query.py" in __iter__
272. self._fetch_all()
File "/home/user/MyProjects/forest-venv/lib/python3.5/site-packages/django/db/models/query.py" in _fetch_all
1179. self._result_cache = list(self._iterable_class(self))
File "/home/user/MyProjects/forest-venv/lib/python3.5/site-packages/django/db/models/query.py" in __iter__
63. obj = model_cls.from_db(db, init_list, row[model_fields_start:model_fields_end])
File "/home/user/MyProjects/forest-venv/lib/python3.5/site-packages/django/db/models/base.py" in from_db
507. new = cls(*values)
File "/home/user/MyProjects/forest-venv/lib/python3.5/site-packages/django/db/models/base.py" in __init__
424. _setattr(self, field.attname, val)
File "/home/user/MyProjects/forest-venv/lib/python3.5/site-packages/django/contrib/gis/db/models/proxy.py" in __set__
75. instance.__class__.__name__, gtype, type(value)))
Exception Type: TypeError at /api/cutarea-allotment/
Exception Value: Cannot set Allotment SpatialProxy (POLYGON) with value of type: <class 'django.contrib.gis.geos.polygon.Polygon'>
这是模型的定义:
from renter.models import *
from classification_list.models import*
from django.contrib.gis.db import models
from django.contrib.gis.geos import Polygon
...
class All(models.Model):
geom = models.PolygonField(geography=True, null=True, blank=True, verbose_name='geom')
num_kvr = models.ForeignKey(QartalKeys, models.DO_NOTHING, blank=True, null=True)
allot_num = models.SmallIntegerField(blank=True, null=True)
怎么了?我没有找到有关此问题的相关问题或有用的建议.谢谢.
What is wrong? I didn't find a relevant problem or a useful suggestion for this problem. Thanks.
推荐答案
问题必须与 PolygonField
的 geography=True
参数有关.
阅读关于geography<的文档/code> 启用字段
我们看到以下内容:
The problem must be related to the geography=True
argument of the PolygonField
.
Reading the documentation about geography
enabled fields we see the following:
geography 类型为用地理坐标(例如,WGS84 经度/纬度)表示的空间特征提供本机支持. 与几何类型使用的平面不同,geography 类型使用其球面表示数据.在地理柱上执行的距离和测量操作会自动采用大圆弧计算并返回线性单位.换句话说,当在两个地理区域上调用 ST_Distance 时,将返回一个以米为单位的值(而不是在 WGS84 中的几何列上调用度数).
The geography type provides native support for spatial features represented with geographic coordinates (e.g., WGS84 longitude/latitude). Unlike the plane used by a geometry type, the geography type uses a spherical representation of its data. Distance and measurement operations performed on a geography column automatically employ great circle arc calculations and return linear units. In other words, when ST_Distance is called on two geographies, a value in meters is returned (as opposed to degrees if called on a geometry column in WGS84).
由于您将字段设置为期望 geography
类型的对象,然后您尝试传递多边形的非地理表示,因此您会收到错误.
Since you set the field to expect a geography
type object and then you are trying to pass a non geography representation of a Polygon, you get the error.
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