Django: error while calling metaclass base

Question

Here is the error

TypeError: error when calling metaclass bases metaclass: a metaclass of a derived class must be a (non-strict) subclass of the metaclasses of all its bases

The class in question in my models.py

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) 

An error message appears in the line:

 name = models.CharField(max_length=128) 

But I (think) it means the following:

 class Business(models.Model, forms.Form): 

I'm not sure what exactly means how I can inherit my models from models. Model and form. Forms inside one class? Can I not pass two values ​​when creating my class? If so, how?

OTHER IMAGE

 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 

Full trace:

 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 

Answer 1

This is the problem:

 class Business(models.Model, forms.Form): 

You are trying to inherit a model and form. You cannot and should not.

You cannot, because the metaclass of a derived class must be a (non-strict) subclass of the metaclasses of all its bases. The form has a metaclass:

 __metaclass__ = DeclarativeFieldsMetaclass 

The model also has a metaclass:

 __metaclass__ = ModelBase 

If you must do this, you will need to set a metaclass that will be derived from both.

However, you should not do this because django has ModelForms that exist to create forms that model models, saving you the complexity of complexity here. Just stop inheriting the form.