ndb model appengine的ModelForms（djangforms不适用于我）

Question

我使用的是webapp2，ndb模型。
我尝试使用django模型表单和ndb模型。以下是我的设置中的相关部分：

应用程序yaml：

libraries:
- name: webapp2
  version: "2.5.1"
- name: jinja2
  version: latest
- name: markupsafe                                                              
  version: latest
- name: django
  version: 1.3

模型.py：

^{pr2}$

表单.py：

from django.forms import ModelForm
from models import TaskList, TaskCategory, SubTask

class SubTaskForm(ModelForm):
    class Meta:
        model = SubTask

处理者：

class CreateSubTask(BaseHandler):
    def get(self):
        self.render_template('index.html', {'form':SubTaskForm})

app = webapp2.WSGIApplication([('/', IndexPage),
                               ('/subtask', CreateSubTask), ],
                              debug=True)

我得到的错误是： AttributeError:类型对象“SubTask”没有属性“\u meta”

我的问题：有没有一种方法可以在ndb中使用django模型表单，或者如果我犯了一个错误，那是什么？ 如果不是django modelforms，ndb模型是否可以很好地与WTForms一起工作？在

下面是stacktrace：

ERROR    2012-06-23 03:25:58,770 wsgi.py:189] 
Traceback (most recent call last):
  File "/homeproject/expts/google_appengine/google/appengine/runtime/wsgi.py", line 187, in Handle
    handler = _config_handle.add_wsgi_middleware(self._LoadHandler())
  File "/homeproject/expts/google_appengine/google/appengine/runtime/wsgi.py", line 225, in _LoadHandler
    handler = __import__(path[0])
  File "/homeproject/expts/google_appengine/google/appengine/tools/dev_appserver_import_hook.py", line 676, in Decorate
    return func(self, *args, **kwargs)
  File "/homeproject/expts/google_appengine/google/appengine/tools/dev_appserver_import_hook.py", line 1858, in load_module
    return self.FindAndLoadModule(submodule, fullname, search_path)
  File "/homeproject/expts/google_appengine/google/appengine/tools/dev_appserver_import_hook.py", line 676, in Decorate
    return func(self, *args, **kwargs)
  File "/homeproject/expts/google_appengine/google/appengine/tools/dev_appserver_import_hook.py", line 1722, in FindAndLoadModule
    description)
  File "/homeproject/expts/google_appengine/google/appengine/tools/dev_appserver_import_hook.py", line 676, in Decorate
    return func(self, *args, **kwargs)
  File "/homeproject/expts/google_appengine/google/appengine/tools/dev_appserver_import_hook.py", line 1665, in LoadModuleRestricted
    description)
  File "/homeproject/expts/google_appengine/tdl/main.py", line 18, in <module>
    from views import IndexPage, CreateSubTask
  File "/homeproject/expts/google_appengine/google/appengine/tools/dev_appserver_import_hook.py", line 676, in Decorate
    return func(self, *args, **kwargs)
  File "/homeproject/expts/google_appengine/google/appengine/tools/dev_appserver_import_hook.py", line 1858, in load_module
    return self.FindAndLoadModule(submodule, fullname, search_path)
  File "/homeproject/expts/google_appengine/google/appengine/tools/dev_appserver_import_hook.py", line 676, in Decorate
    return func(self, *args, **kwargs)
  File "/homeproject/expts/google_appengine/google/appengine/tools/dev_appserver_import_hook.py", line 1722, in FindAndLoadModule
    description)
  File "/homeproject/expts/google_appengine/google/appengine/tools/dev_appserver_import_hook.py", line 676, in Decorate
    return func(self, *args, **kwargs)
  File "/homeproject/expts/google_appengine/google/appengine/tools/dev_appserver_import_hook.py", line 1665, in LoadModuleRestricted
    description)
  File "/homeproject/expts/google_appengine/tdl/views.py", line 4, in <module>
    from forms import SubTaskForm
  File "/homeproject/expts/google_appengine/google/appengine/tools/dev_appserver_import_hook.py", line 676, in Decorate
    return func(self, *args, **kwargs)
  File "/homeproject/expts/google_appengine/google/appengine/tools/dev_appserver_import_hook.py", line 1858, in load_module
    return self.FindAndLoadModule(submodule, fullname, search_path)
  File "/homeproject/expts/google_appengine/google/appengine/tools/dev_appserver_import_hook.py", line 676, in Decorate
    return func(self, *args, **kwargs)
  File "/homeproject/expts/google_appengine/google/appengine/tools/dev_appserver_import_hook.py", line 1722, in FindAndLoadModule
    description)
  File "/homeproject/expts/google_appengine/google/appengine/tools/dev_appserver_import_hook.py", line 676, in Decorate
    return func(self, *args, **kwargs)
  File "/homeproject/expts/google_appengine/google/appengine/tools/dev_appserver_import_hook.py", line 1665, in LoadModuleRestricted
    description)
  File "/homeproject/expts/google_appengine/tdl/forms.py", line 4, in <module>
    class SubTaskForm(ModelForm):
  File "/homeproject/expts/google_appengine/lib/django_1_3/django/forms/models.py", line 205, in __new__
    opts.exclude, opts.widgets, formfield_callback)
  File "/homeproject/expts/google_appengine/lib/django_1_3/django/forms/models.py", line 145, in fields_for_model
    opts = model._meta
AttributeError: type object 'SubTask' has no attribute '_meta'

Answer 1

请不要使用djangforms，python2.7应用引擎运行时不支持它。在

Answer 2

除了上面的注释，如果您没有提供您的设置主.py文件，djangforms不会呈现。除此之外，您还需要添加一个中间件：

'google.appengine.ext.ndb.NdbDjangoMiddleware'

做以上两件事就能解决问题。在

Answer 3

我从未使用过django表单，因此可能会缺少一些魔力（而且可能无法实现……），但这一行看起来是错误的：

self.render_template('index.html', {'form':SubTaskForm})

将类传递给模板，而不是它的实例：

^{pr2}$