为什么我在Django中遇到DrawingProfile.DoesNotExist异常？

如何解决为什么我在Django中遇到DrawingProfile.DoesNotExist异常？

我正在尝试从继承的代码中解决API中的错误。我是Django和Deliciouspie的新手，所以我不知道该如何解决。我已经导入了我的模型，但是我不知道为什么会出现DidsNotExist异常。 在保存功能中，default_drawing设置为true。我认为这会阻止用户手动将其设置为true

from erma_drawing import models as erma_drawing_models
    def hydrate(self,bundle):
        '''
        Hydrate things
        '''
        try:
            bundle.obj.profile = erma_drawing_models.DrawingProfile.objects.get(default_drawing=True)
        except DrawingProfile.DoesNotExist:
            logger.error("Drawing Profile does not exist")
        return super().hydrate(bundle)
Model.py
    class DrawingProfile(models.Model):
name = models.CharField(
    max_length=32,null=False,blank=False,unique=True)
privilege = models.ForeignKey(
    'erma_authorization.Privilege',on_delete=models.PROTECT,null=True,blank=True,help_text='The privilege required to' +
              ' create new drawings that use this profile')
default_drawing = models.BooleanField(
    default=False,blank=False)

def __init__(self,*args,**kwargs):
    super(DrawingProfile,self).__init__(*args,**kwargs)

def save(self,**kwargs):
    if kwargs.pop('data_load',False):
        return super().save(*args,**kwargs)
    default_drawing = None
    existing_record = None
    if not self._state.adding:
        existing_record = DrawingProfile.objects.get(pk=self.pk)
    force = kwargs.pop('force',False)
  # Remove the ability to change the default without the force argument
  #this prevents users from changing the default,without setting a new record as default.
    if not force and existing_record.default_drawing:
        self.default_drawing = True
    if self.default_drawing and not existing_record.default_drawing:
        default_drawing = DrawingProfile.objects.get(
            default_drawing=True)
        # This should never happen,but we'll make sure anyways...
        if default_drawing.pk != self.pk:
            default_drawing.default_drawing = False
        super(DrawingProfile,self).save(*args,**kwargs)
        default_drawing.save(force=True)
    else:
        super(DrawingProfile,**kwargs)

def delete(self,**kwargs):
    # Never delete the default drawing object.
    if self.default_drawing:
        raise Exception('Cannot delete the default drawing')
    default_drawing = DrawingProfile.objects.get(default_drawing=True)
    # Update any existing drawings that use this profile to use the
    # default drawing profile instead
    drawings = self.drawing_set.all()
    if len(drawings):
        for record in drawings:
            record.profile = default_drawing
            record.save(fast=True)
        DrawingProfile.objects.get(pk=self.pk).delete()
    else:
        return super(DrawingProfile,self).delete(*args,**kwargs)

class Meta:
    db_table = 'drawing_profile'
    ordering = ['id']

解决方法

try/catch

此参数在您的模型中默认设置为try { File obraz = new File("C:\\Users\\ender\\Pictures\\logo.jpg"); Image image = ImageIO.read(obraz); } catch (IOException ex) { ex.printStackTrace(); } } public void paintComponent(Graphics g){ Graphics2D g2 = (Graphics2D) g; g2.drawImage(image); } 。您是否知道目前有任何模型将其设置为True？之所以得到default_drawing = models.BooleanField(default=False,null=False,blank=False) ，是因为您没有任何False字段设置为DoesNotExist的{​​{1}}模型。