如何解决如何解决此django OneToOneField模型错误?
我正在尝试创建一个模型,该模型需要与大量公式所使用的原料之间一对一的关系。这是我的代码:
from django.db import models
from dashboard.models import Formulas,Feedstock
class FeedstockFormulas(models.Model):
ratio = models.FloatField()
feedstock = models.OneToOneField(Feedstock,on_delete=models.CASCADE,default="0")
formulas = models.ForeignKey(Formulas,on_delete=models.CASCADE)
这是我得到的错误:
Traceback (most recent call last):
File "/home/isaacrpl7/.local/lib/python3.8/site-packages/django/db/models/fields/related.py",line 798,in __init__
to._meta.model_name
AttributeError: module 'dashboard.models.Feedstock' has no attribute '_meta'
During handling of the above exception,another exception occurred:
Traceback (most recent call last):
File "manage.py",line 22,in <module>
execute_from_command_line(sys.argv)
File "/home/isaacrpl7/.local/lib/python3.8/site-packages/django/core/management/__init__.py",line 401,in execute_from_command_line
utility.execute()
File "/home/isaacrpl7/.local/lib/python3.8/site-packages/django/core/management/__init__.py",line 377,in execute
django.setup()
File "/home/isaacrpl7/.local/lib/python3.8/site-packages/django/__init__.py",line 24,in setup
apps.populate(settings.INSTALLED_APPS)
File "/home/isaacrpl7/.local/lib/python3.8/site-packages/django/apps/registry.py",line 114,in populate
app_config.import_models()
File "/home/isaacrpl7/.local/lib/python3.8/site-packages/django/apps/config.py",line 211,in import_models
self.models_module = import_module(models_module_name)
File "/usr/lib/python3.8/importlib/__init__.py",line 127,in import_module
return _bootstrap._gcd_import(name[level:],package,level)
File "<frozen importlib._bootstrap>",line 1014,in _gcd_import
File "<frozen importlib._bootstrap>",line 991,in _find_and_load
File "<frozen importlib._bootstrap>",line 975,in _find_and_load_unlocked
File "<frozen importlib._bootstrap>",line 671,in _load_unlocked
File "<frozen importlib._bootstrap_external>",line 783,in exec_module
File "<frozen importlib._bootstrap>",line 219,in _call_with_frames_removed
File "/mnt/c/Users/isaac/Documents/Github/uniaoracoes/dashboard/models/__init__.py",line 1,in <module>
from .Formulas import Formulas
File "/mnt/c/Users/isaac/Documents/Github/uniaoracoes/dashboard/models/Formulas.py",line 2,in <module>
from dashboard.models import FeedstockFormulas
File "/mnt/c/Users/isaac/Documents/Github/uniaoracoes/dashboard/models/FeedstockFormulas.py",line 4,in <module>
class FeedstockFormulas(models.Model):
File "/mnt/c/Users/isaac/Documents/Github/uniaoracoes/dashboard/models/FeedstockFormulas.py",line 6,in FeedstockFormulas
feedstock = models.OneToOneField(Feedstock,default="0")
File "/home/isaacrpl7/.local/lib/python3.8/site-packages/django/db/models/fields/related.py",line 1049,in __init__
super().__init__(to,on_delete,to_field=to_field,**kwargs)
File "/home/isaacrpl7/.local/lib/python3.8/site-packages/django/db/models/fields/related.py",line 800,in __init__
assert isinstance(to,str),(
AssertionError: OneToOneField(<module 'dashboard.models.Feedstock' from '/mnt/c/Users/isaac/Documents/Github/uniaoracoes/dashboard/models/Feedstock.py'>) is invalid. First parameter to ForeignKey must be either a model,a model name,or the string 'self'
我无法真正解决它,因为ForeignKey的第一个参数已经是模型...
解决方法
这似乎是某处循环进口的副产品。
尝试更改为
feedstock = models.OneToOneField("dashboard.Feedstock",on_delete=models.CASCADE,default="0")
formulas = models.ForeignKey("dashboard.Formulas",on_delete=models.CASCADE)
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