Django模型错误最大递归深度超出 [英] Django model error maximum recursion depth exceeded
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问题描述
我正在关注此指南并且在保存时收到以下错误...
/ admin / products / product / 2 / $ b $中的RuntimeError b最大递归深度超过
为什么会收到此错误?我已经包括了完整的模型。
谢谢
models.py:
class Product(models.Model):
pre>
title = models.CharField(max_length = 60)
qr_url = models.URLField(blank =真的)
qr_image = models.ImageField(
upload_to =public / uploads /,
height_field =qr_image_height,
width_field =qr_image_width,
null = true,
blank = True,
editable = False
)
qr_image_height = models.PositiveIntegerField(null = True,blank = True,editable = False)
qr_image_width = models.PositiveIntegerField(null = True,blank = True,editable = False)
#FK
category = models.ManyToManyField(ProductCategory)
attribute_answers = models.ManyToManyField(AttributeAnswers )
#自定义管理器
def __unicode __(self):
return self.title
def qr_code(self):
return' '%self.qr_image.url
qr_code.allow_tags = True
def product_pre_save(sender,instance,** kwargs):
if not instance.pk:
instance._QRCODE = True
else:
if hasattr(instance,'_QRCODE'):
instance._QRCODE = False
else:
instance._QRCODE = True
models.signals.pre_save.connect(product_pre_save,sender = Product)
def product_post_save(sender,instance,** kwargs):
if instance._QRCODE:
instance._QRCODE = False
如果instance.qr_image:
instance.qr_image.delete()
qr = QRCode(4,QRErrorCorrectLevel.L)
qr.addData(实例。 qr_url)
qr.make()
image = qr.makeImage()
#将图像保存到字符串缓冲区
image_buffer = StringIO()
图像.save(image_buffer,format ='JPEG')
image_buffer.seek(0)
#我们使用django文件存储系统来保存图像。
file_name ='UrlQR_%s.jpg'%instance.id
file_object = File(image_buffer,file_name)
content_file = ContentFile(file_object.read())
instance.qr_image .save(file_name,content_file,save = True)
models.signals.post_save.connect(product_post_save,sender = Product)
解决方案您从教程中以错误的方式复制:)
def product_post_save(sender,instance,** kwargs):
if instance._QRCODE:
instance._QRCODE = False
if instance.qr_image:
instance.qr_image.delete()
qr = QRCode(4,QRErrorCorrectLevel.L)
qr.addData(instance.qr_url)
qr.make()
image = qr.makeImage()
#将图像保存到字符串缓冲区
image_buffer = StringIO()
image.save(image_buffer,format ='JPEG')
image_buffer。 seek(0)
#我们使用django文件存储系统保存图像。
file_name ='UrlQR_%s.jpg'%instance.id
file_object = File(image_buffer,file_name)
content_file = ContentFile(file_object.read())
instance._already_saving = True
instance.qr_image.save(file_name,content_file,save = True)
I'm following this guide and I get the following error when saving...
RuntimeError at /admin/products/product/2/ maximum recursion depth exceeded
Why do I get this error? I have included the full model below.
Thanks
models.py:
class Product(models.Model): title = models.CharField(max_length=60) qr_url = models.URLField(blank=True) qr_image = models.ImageField( upload_to="public/uploads/", height_field="qr_image_height", width_field="qr_image_width", null=True, blank=True, editable=False ) qr_image_height = models.PositiveIntegerField(null=True, blank=True, editable=False) qr_image_width = models.PositiveIntegerField(null=True, blank=True, editable=False) #FK category = models.ManyToManyField(ProductCategory) attribute_answers = models.ManyToManyField(AttributeAnswers) # Custom Managers def __unicode__(self): return self.title def qr_code(self): return '' % self.qr_image.url qr_code.allow_tags = True def product_pre_save(sender, instance, **kwargs): if not instance.pk: instance._QRCODE = True else: if hasattr(instance, '_QRCODE'): instance._QRCODE = False else: instance._QRCODE = True models.signals.pre_save.connect(product_pre_save, sender=Product) def product_post_save(sender, instance, **kwargs): if instance._QRCODE: instance._QRCODE = False if instance.qr_image: instance.qr_image.delete() qr = QRCode(4, QRErrorCorrectLevel.L) qr.addData(instance.qr_url) qr.make() image = qr.makeImage() #Save image to string buffer image_buffer = StringIO() image.save(image_buffer, format='JPEG') image_buffer.seek(0) #Here we use django file storage system to save the image. file_name = 'UrlQR_%s.jpg' % instance.id file_object = File(image_buffer, file_name) content_file = ContentFile(file_object.read()) instance.qr_image.save(file_name, content_file, save=True) models.signals.post_save.connect(product_post_save, sender=Product)
解决方案You copiend in wrong way from tutorial :)
def product_post_save(sender, instance, **kwargs): if instance._QRCODE: instance._QRCODE = False if instance.qr_image: instance.qr_image.delete() qr = QRCode(4, QRErrorCorrectLevel.L) qr.addData(instance.qr_url) qr.make() image = qr.makeImage() #Save image to string buffer image_buffer = StringIO() image.save(image_buffer, format='JPEG') image_buffer.seek(0) #Here we use django file storage system to save the image. file_name = 'UrlQR_%s.jpg' % instance.id file_object = File(image_buffer, file_name) content_file = ContentFile(file_object.read()) instance._already_saving = True instance.qr_image.save(file_name, content_file, save=True)
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