python - 类型对象 'X' 没有属性 'DoesNotExist' 与 django

Question

我一直收到 has no attribute DoesNotExist 错误。

有什么想法吗？

到目前为止我试过:

    try:
        current_report = Report.objects.get(account_profile=current_profile)
    except Report.DoesNotExist:
        print("report doesn't exist")
        current_report=None

我的调试显示类型对象“Report”没有属性“DoesNotExist”在 current_report(etc) 行:

我也试过:

from django.core.exceptions import ObjectDoesNotExist
...
except Report.ObjectDoesNotExist: 

和

try:
    Report.objects.get(account_profile=current_profile)
except Report.DoesNotExist:
    print("report doesn't exist")
    current_report=None

和

try:
    Report.objects.get(account_profile=current_profile)
except ObjectDoesNotExist:
    print("report doesn't exist")
    current_report=None

为什么类型对象“X”没有属性“DoesNotExist”？我正在使用 Django。

在我的 Models.py 中我有:

class Report(models.Model):
    account_profile = models.ForeignKey(Profile)
    total_visitors = models.CharField(max_length=200, blank=True, null=True)
    last_week_visitors = models.CharField(max_length=200, blank=True, null=True)
    new_visitors_this_wk = models.CharField(max_length=200, blank=True, null=True)
    new_visitors_last_wk = models.CharField(max_length=200, blank=True, null=True)
    bounce_rate = models.CharField(max_length=200, blank=True, null=True)
    last_week_bounce_rate = models.CharField(max_length=200, blank=True, null=True)
    percent_new_referrals = models.CharField(max_length=100, blank=True, null=True)
    last_week_new_referrals = models.CharField(max_length=100, blank=True, null=True)
    this_week_pg_load_time = models.CharField(max_length=100, blank=True, null=True)
    last_week_pg_load_time = models.CharField(max_length=100, blank=True, null=True)
    date_created = models.DateTimeField(default=datetime.now, blank=True)
    week_number = models.CharField(max_length=10, blank=True, null=True)

    #HTML table for browsers with avg session durations less than 10 seconds
    sessions_vs_browser = models.TextField(blank=True, null=True)
    sessions_vs_country = models.TextField(blank=True, null=True)
    sessions_vs_device = models.TextField(blank=True, null=True)
    total_sessions = models.CharField(max_length=100, blank=True, null=True)
    keywords = models.ManyToManyField(Keyword)
    referrals = models.ManyToManyField(Referral)
    pages_speeds = models.ManyToManyField(PageSpeed)
    bounces = models.ManyToManyField(BouncePage)

Answer 1

导入异常，

from django.core.exceptions import ObjectDoesNotExist

捕获它

try:
    Report.objects.get(account_profile=current_profile)
except ObjectDoesNotExist:
    print("report doesn't exist")
    current_report=None

因为 ObjectDoesNotExist 是 Django 特有的异常，您必须导入它才能捕获它。

此外，执行 Model.ObjectDoesNotExist 也不是模型的属性