TypeError:on_delete必须是可调用的 [英] TypeError: on_delete must be callable
问题描述
突然我收到一条错误消息,提示 TypeError:on_delete必须是可调用的。
我不知道如何解决此错误,因为我没有看到 field = models.ForeignKey(默认= 1,on_delete ='CASCADE',to ='main.Category'),
在我的代码中的任何地方都提到过。
文件 /home/arch/myproject/main/migrations/0014_auto_20191025_1154.py,第6行,在< module>
类Migration(migrations.Migration):
文件 /home/arch/myproject/main/migrations/0014_auto_20191025_1154.py,第47行,位于Migration
field = models.ForeignKey(默认= 1,on_delete ='CASCADE',to ='main.Category'),
File /home/arch/.local/lib/python3.8/site-packages/django/db/models/fields/ related.py,第801行,位于__init__
中,引发TypeError('on_delete必须是可调用的。')
TypeError:on_delete必须是可调用的。
其中一个模型中的字段具有:
class SomeModel(models.Model):
#…
field = models.ForeignKey(默认值= 1, on_delete ='CASCADE' ,to ='main.Category')
,但是您不能将字符串传递给 on_delete =…
参数,它应该是:
class SomeModel(models.Model):
#…
field = models.ForeignKey(默认值= 1, on_delete = models.CASCADE ,to ='main.Category')
您还需要删除迁移文件( main / migrations / 0014_auto_20191025_1154.py
),并进行新的迁移。
Suddenly I am getting an error saying TypeError: on_delete must be callable.
I don't know how to solve this error as I don't see field=models.ForeignKey(default=1, on_delete='CASCADE', to='main.Category'),
mentioned anywhere in my code.
File "/home/arch/myproject/main/migrations/0014_auto_20191025_1154.py", line 6, in <module>
class Migration(migrations.Migration):
File "/home/arch/myproject/main/migrations/0014_auto_20191025_1154.py", line 47, in Migration
field=models.ForeignKey(default=1, on_delete='CASCADE', to='main.Category'),
File "/home/arch/.local/lib/python3.8/site-packages/django/db/models/fields/related.py", line 801, in __init__
raise TypeError('on_delete must be callable.')
TypeError: on_delete must be callable.
A field in one of your models has:
class SomeModel(models.Model):
# …
field=models.ForeignKey(default=1, on_delete='CASCADE', to='main.Category')
but you can not pass a string to on_delete=…
parameter, it should be:
class SomeModel(models.Model):
# …
field=models.ForeignKey(default=1, on_delete=models.CASCADE, to='main.Category')
You will need to remove the migration file (main/migrations/0014_auto_20191025_1154.py
) as well, and make new migrations.
这篇关于TypeError:on_delete必须是可调用的的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!