Django 类覆盖失败系统检查

Question

我正在尝试在我的开发环境中从 Django 1.7.1 升级到 1.8。我的一个模型似乎有问题，我认为核心文件升级了，它弄乱了我的模型。我似乎无法弄清楚是什么导致它死亡。

这是我尝试运行 manage.py 测试时遇到的唯一错误

CommandError: System check identified some issues:

ERRORS:
graphite_alerts.CheckResults: (models.E020) The 'CheckResults.check()' class method is currently   overridden by <django.db.models.fields.related.ReverseSingleRelatedObjectDescriptor object at 0x3a76310>.

我尝试更改类名并环顾我的模型，但似乎找不到任何会导致覆盖错误的东西

这是课程：

class CheckResults(models.Model):

    WARN = 'warn'
    ERROR = 'error'
    OK = 'ok'
    DOWN = 'down'
    STATUS_CHOICES = (
        (WARN, 'Warn'),
        (ERROR, 'Error'),
        (OK, 'OK'),
        (DOWN, 'Down'),
    )

    target = models.CharField(max_length=1000)
    additional_graph_target = models.CharField(max_length=1000, blank=True)
    value = models.DecimalField(max_digits=9, decimal_places=2)
    timestamp = models.DateTimeField(db_index=True)
    status = models.CharField(max_length=6, choices=STATUS_CHOICES, default='ok')
    check = models.ForeignKey(Check, related_name='results')
    tags = TaggableManager()

    def __unicode__(self):
        return self.target

    @models.permalink
    def get_absolute_url(self):
        return ('graphite-check-result-list-view', (), {'pk': self.check.pk, 'target': self.target})

    def generate_graphite_image_url(self):
        params = { }
        params['target'] = []
        params['target'].append(self.target)
        params['target'].append('threshold(' + str(self.check.warn) + ',"Warn","yellow")')
        params['target'].append('threshold(' + str(self.check.error) + ',"Error","red")')
        params['from'] = '-7days'
        params['width'] = '900'
        params['minorGridLineColor'] = 'C0C0C0'
        params['majorGridLineColor'] = 'C0C0C0'
        params['bgcolor'] = '333333'
        request = requests.get(self.check.GRAPHITE_URL+self.check.RENDER_PAGE,params=params)
        return urllib2.unquote(request.url.decode('UTF-8'))

    def generate_additional_graphite_image_url(self):
        params = { }
        params['target'] = []
        params['target'].append(self.additional_graph_target)
        params['target'].append('threshold(' + str(self.check.warn) + ',"Warn","yellow")')
        params['target'].append('threshold(' + str(self.check.error) + ',"Error","red")')
        params['from'] = '-7days'
        params['width'] = '900'
        params['minorGridLineColor'] = 'C0C0C0'
        params['majorGridLineColor'] = 'C0C0C0'
        params['bgcolor'] = '333333'
        request = requests.get(self.check.GRAPHITE_URL+self.check.RENDER_PAGE,params=params)
        return urllib2.unquote(request.url.decode('UTF-8'))

    class Meta:
        ordering = ("timestamp",)
        unique_together = (("target", "timestamp"),)

Answer 1

我在将项目从 1.6 更新到 1.8 时遇到了同样的问题。

问题似乎源于您的模型具有的 check 字段。
它与Model.check() 方法冲突，该方法在Django's system checks 期间调用以帮助您识别模型定义中的错误。

您必须重命名该字段。