Django:模型对象“没有属性'_meta'"；在基于班级的观点 [英] Django: model object "has no attribute '_meta'" in class based view

问题描述

Stackoverflow大家好，

Hi Stackoverflow people,

我正在使用基于类的视图，并且对于一个测试站点，我遵循了

I am working with class based views and for a test site, I followed the documentation to setup the class based views. For a project site (based on the project model below), I just want to create a quick CRUD application for the simple project model below.

models.py

class Project(models.Manager):
    name =  models.CharField(_('Name of the Project'), max_length = 100,)
    slug = models.SlugField(max_length=100,)
    ...

views.py

from django.views.generic.edit import CreateView, UpdateView, DeleteView
from django.core.urlresolvers import reverse_lazy
from project.models import Project

class ProjectCreate(CreateView):
    model = Project

class ProjectUpdate(UpdateView):
    model = Project

当我现在加载应调用ProjectCreate类的\project\add时，出现以下错误: 类型对象项目"没有属性"_meta"

When I now load \project\add, which should call the ProjectCreate class, I get the following error: type object 'Project' has no attribute '_meta'

我不明白为什么.模型类通常不需要元信息.在其他基于类的项目中，我没有遇到此问题.

I do not understand why. The model class normally does not require meta information. In other class based projects, I did not encounter this problem.

谢谢您的建议！

跟踪

Django Version: 1.4.1
Python Version: 2.7.1

Traceback:
File "/Users/neurix/Development/vir_project_2.0/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response
  111.                         response = callback(request, *callback_args, **callback_kwargs)
File "/Users/neurix/Development/vir_project_2.0/lib/python2.7/site-packages/django/views/generic/base.py" in view
  48.             return self.dispatch(request, *args, **kwargs)
File "/Users/neurix/Development/vir_project_2.0/lib/python2.7/site-packages/django/views/generic/base.py" in dispatch
  69.         return handler(request, *args, **kwargs)
File "/Users/neurix/Development/vir_project_2.0/lib/python2.7/site-packages/django/views/generic/edit.py" in get
  168.         return super(BaseCreateView, self).get(request, *args, **kwargs)
File "/Users/neurix/Development/vir_project_2.0/lib/python2.7/site-packages/django/views/generic/edit.py" in get
  130.         form_class = self.get_form_class()
File "/Users/neurix/Development/vir_project_2.0/lib/python2.7/site-packages/django/views/generic/edit.py" in get_form_class
  89.             return model_forms.modelform_factory(model)
File "/Users/neurix/Development/vir_project_2.0/lib/python2.7/site-packages/django/forms/models.py" in modelform_factory
  407.     return form_metaclass(class_name, (form,), form_class_attrs)
File "/Users/neurix/Development/vir_project_2.0/lib/python2.7/site-packages/django/forms/models.py" in __new__
  206.                                       opts.exclude, opts.widgets, formfield_callback)
File "/Users/neurix/Development/vir_project_2.0/lib/python2.7/site-packages/django/forms/models.py" in fields_for_model
  146.     opts = model._meta

Exception Type: AttributeError at /project/add/
Exception Value: type object 'Project' has no attribute '_meta'

推荐答案

更改:

class Project(models.Manager)

收件人:

class Project(models.Model)

因为models.Model是实际类，必须扩展才能创建自定义模型，并且实际上还使用管理器来覆盖所涉及的数据库操作模型.

because models.Model is actual class you must extend to create custom models, and managers are actually used to override database operations models are involved in.

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