[英]Django: Error when calling the metaclass bases
這是錯誤
TypeError:調用元類基類元類沖突時出錯:派生類的元類必須是其所有基類的元類的(非嚴格)子類
我的models.py中有問題的類
class Business(models.Model, forms.Form):
name = models.CharField(max_length=128)
tel_no = models.CharField(max_length=11)
address_ln1 = models.CharField(max_length=128)
address_ln2 = models.CharField(max_length=128)
city = models.CharField(max_length=64)
county = GBCountySelect()
postcode = GBPostcodeField()
website = models.URLField(max_length=128)
# Logging Info
slug = models.SlugField()
date_added = models.DateField(auto_now_add=True)
time_added = models.TimeField()
added_by_user = models.CharField(max_length=64)
last_edit_time = models.TimeField(auto_now=True)
last_edit_date = models.DateField(auto_now=True)
我收到錯誤的行:
name = models.CharField(max_length=128)
但我(想)這意味着這個:
class Business(models.Model, forms.Form):
我不確定它究竟是什么意思,我如何從models.Model和forms.Form繼承我的模型在同一個類中? 在創建課程時,我不能傳遞兩個值嗎? 如果是這樣的話?
另一個編輯
All my imports
from django.db import models
from django import forms
from django.contrib.localflavor import generic
from django.contrib.localflavor.gb.forms import GBPostcodeField, GBCountySelect
完全追溯:
Traceback (most recent call last):
File "manage.py", line 10, in <module>
execute_from_command_line(sys.argv)
File "/home/jws1000/.virtualenvs/glutenfree/lib/python2.7/site-packages/django/core/management/__init__.py", line 443, in execute_from_command_line
utility.execute()
File "/home/jws1000/.virtualenvs/glutenfree/lib/python2.7/site-packages/django/core/management/__init__.py", line 382, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/home/jws1000/.virtualenvs/glutenfree/lib/python2.7/site-packages/django/core/management/base.py", line 196, in run_from_argv
self.execute(*args, **options.__dict__)
File "/home/jws1000/.virtualenvs/glutenfree/lib/python2.7/site-packages/django/core/management/base.py", line 231, in execute
self.validate()
File "/home/jws1000/.virtualenvs/glutenfree/lib/python2.7/site-packages/django/core/management/base.py", line 266, in validate
num_errors = get_validation_errors(s, app)
File "/home/jws1000/.virtualenvs/glutenfree/lib/python2.7/site-packages/django/core/management/validation.py", line 30, in get_validation_errors
for (app_name, error) in get_app_errors().items():
File "/home/jws1000/.virtualenvs/glutenfree/lib/python2.7/site-packages/django/db/models/loading.py", line 158, in get_app_errors
self._populate()
File "/home/jws1000/.virtualenvs/glutenfree/lib/python2.7/site-packages/django/db/models/loading.py", line 64, in _populate
self.load_app(app_name, True)
File "/home/jws1000/.virtualenvs/glutenfree/lib/python2.7/site-packages/django/db/models/loading.py", line 88, in load_app
models = import_module('.models', app_name)
File "/home/jws1000/.virtualenvs/glutenfree/lib/python2.7/site-packages/django/utils/importlib.py", line 35, in import_module
__import__(name)
File "/home/jws1000/envs/glutenfree/glutenfree/glutenfree/listings/models.py", line 9, in <module>
class Business(models.Model, forms.Form):
File "/home/jws1000/.virtualenvs/glutenfree/lib/python2.7/site-packages/django/db/models/base.py", line 41, in __new__
new_class = super_new(cls, name, bases, {'__module__': module})
TypeError: Error when calling the metaclass bases
metaclass conflict: the metaclass of a derived class must be a (non-strict) subclass of the metaclasses of all its bases
這就是問題:
class Business(models.Model, forms.Form):
您正嘗試從模型和表單繼承。 你不能,你不應該。
您不能,因為派生類的元類必須是其所有基礎的元類的(非嚴格)子類。 表格有一個元類:
__metaclass__ = DeclarativeFieldsMetaclass
模型還有一個元類:
__metaclass__ = ModelBase
如果你這樣做,你需要設置一個從這兩個派生的元類。
但是,你不應該這樣做,因為django有ModelForms,它可以創建模型模型,為你節省復雜的麻煩。 只需停止繼承Form。
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