Question

我正在为包含MultiPolygonField的模型创建Django工厂。我运行测试时抛出错误。详细信息如下。

我创建了一个特殊的提供程序来伪造此字段。该代码取自Django文档：

from django.contrib.gis.geos import (
    Polygon,
    MultiPolygon,
)
import factory
from faker import Faker
from faker.providers import BaseProvider

fake = Faker()


class Provider(BaseProvider):
    def mpoly(self):
        p1 = Polygon( ((0, 0), (0, 1), (1, 1), (0, 0)) )
        p2 = Polygon( ((1, 1), (1, 2), (2, 2), (1, 1)) )
        mpoly = MultiPolygon(p1, p2)
        return mpoly

fake.add_provider(Provider)


class GeographyFactory(factory.DjangoModelFactory):
    """
    A Factory to generate mock GeographyFactory objects to be used
    in tests.
    """

    class Meta:
        model = 'location.Geography'

    name = factory.Faker('name')
    mpoly = fake.mpoly

但是，我在运行测试时遇到的错误使我难过。

TypeError: Cannot set Geography SpatialProxy (MULTIPOLYGON) with value of type: <class 'method'>

似乎暗示我没有返回正确的类型，但是我无法弄清它想要什么，而不是我返回的MultiPolygon对象。为什么认为我要返回<class 'method'>？

任何建议都将受到欢迎！

Answer 1

我建议定义一个自定义的模糊属性，这将使您的测试具有一定的随机性。

import factory
import factory.fuzzy
from factory import random


class FuzzyPolygon(factory.fuzzy.BaseFuzzyAttribute):
    """Yields random polygon"""
    def __init__(self, length=None, **kwargs):
        if length is None:
            length = random.randgen.randrange(3, 20, 1)
        if length < 3:
            raise Exception("Polygon needs to be 3 or greater in length.")
        self.length = length
        super().__init__(**kwargs)

    def get_random_coords(self):
        return (
            factory.Faker("latitude").generate({}),
            factory.Faker("longitude").generate({}),
        )

    def fuzz(self):
        prefix = suffix = self.get_random_coords()
        coords = [self.get_random_coords() for __ in range(self.length - 1)]
        return Polygon([prefix] + coords + [suffix])


class FuzzyMultiPolygon(factory.fuzzy.BaseFuzzyAttribute):
    """Yields random multipolygon"""
    def __init__(self, length=None, **kwargs):
        if length is None:
            length = random.randgen.randrange(2, 20, 1)
        if length < 2:
            raise Exception("MultiPolygon needs to be 2 or greater in length.")
        self.length = length
        super().__init__(**kwargs)

    def fuzz(self):
        polygons = [FuzzyPolygon().fuzz() for __ in range(self.length)]
        return MultiPolygon(*polygons)

然后您可以在DjangoModelfactory中使用它们；

class GeographyFactory(factory.DjangoModelFactory):
    """
    A Factory to generate mock GeographyFactory objects to be used
    in tests.
    """

    class Meta:
        model = 'location.Geography'

    name = factory.Faker('name')
    mpoly = FuzzyMultiPolygon()

如何伪造多多边形字段？

1 个答案: