当我尝试对我的一个模型的 url 进行 API 调用时，我面临以下情况：
Cannot set Allotment SpatialProxy (POLYGON) with value of type: <class 'django.contrib.gis.geos.polygon.Polygon'>
我在PGadmin中检查模型的定义和数据类型。
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？我没有找到相关的问题或针对此问题的有用建议。谢谢。
问题必须与PolygonField的geography=True参数有关。
阅读有关启用geography字段的文档，我们看到以下内容：
地理类型为用地理坐标(例如，WGS84 经度/纬度(表示的空间要素提供本机支持。与几何类型使用的平面不同，地理类型使用其数据的球面表示。对地理列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，在两个地理上调用ST_Distance时，将返回以米为单位的值(与在 WGS84 中的几何列上调用的度数相反(。
由于您将字段设置为需要geography类型对象，然后尝试传递多边形的非地理表示，因此会出现错误。