Question

当我尝试对模型的URL进行API调用时，会遇到以下问题：

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？我没有发现相关问题或对该问题的有用建议。谢谢。

Answer 1

该问题必须与geography=True的{{1}}参数有关。
阅读documentation about geography enabled fields后，我们将看到以下内容：

地理类型为由地理坐标表示的空间特征（例如WGS84经度/纬度）提供了本机支持。与几何类型所使用的平面不同，地理类型使用了其球形表示数据。在地理列上执行的距离和测量操作自动采用大圆弧计算并返回线性单位。换句话说，在两个地理位置上调用ST_Distance时，将返回以米为单位的值（如果在WGS84中的几何列上调用则为度）。

由于您将字段设置为期望使用PolygonField类型的对象，然后尝试传递多边形的非地理表示形式，因此会出现错误。

无法将MODEL_NAME SpatialProxy（POLYGON）设置为以下类型的值：<class'django.contrib.gis.geos.polygon.polygon'=“”>

1 个答案: