如何在Django ORM中查询特定日期（DateField）

Question

我有一个应用程序，需要查询数据库，看看某个日期是否已经有用户的记录。比如，我想查查用户y在日期x是否已经有了条目。

我有一个模型，里面有以下字段：

class MyModel(models.Model):
    user = models.ForeignKey(User)
    day = models.DateField()
    info = models.CharField(max_length=100)

在forms.py文件中，我写了：

class MyForm(forms.ModelForm):

    class Meta:
        model = MyModel

然后在views.py的代码里，我想检查这个日期在数据库中是否存在，所以我执行了：

from datetime import date
from myapp.models import MyModel
from myapp.forms import MyForm
...
#inside the view function
form = MyForm(request.POST)
day = date(form.day)
if days.objects.filter(user=request.user, day=bookday).exists():
... do stuff

结果是：

Environment:


Request Method: POST
Request URL: http://127.0.0.1:8000/test_url/

Django Version: 1.5
Python Version: 2.7.3
Installed Applications:
('django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.sites',
 'django.contrib.messages',
 'django.contrib.staticfiles',
 'django.contrib.admin',
 'south',
 'myapp')
Installed Middleware:
('django.middleware.common.CommonMiddleware',
 'django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware')


Traceback:
File "/django/env/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response
  115.                         response = callback(request, *callback_args, **callback_kwargs)
File "/django/env/lib/python2.7/site-packages/django/contrib/auth/decorators.py" in _wrapped_view
  25.                 return view_func(request, *args, **kwargs)
File "/django/env/myproject/myapp/views.py" in test_url
  26.             bookday = date(form.day)

Exception Type: AttributeError at /test_url/
Exception Value: 'MyForm' object has no attribute 'day'

虽然这个日期字段确实是一个日期类型（DateField）。那我该怎么做才能解决这个问题呢？

POST数据是：

POST
Variable    Value

csrfmiddlewaretoken =    u'blahblah'

day =   u'03/27/2013'

user =  u'2'

HTML模板表单是：

<form method="post" action="." >
{{ form.user }}
{{ form.day}}

<input type="submit" value="Submit" />
{% csrf_token %}
</form>

编辑：我已经澄清了代码，并附上了错误追踪信息。

django orm 错误追踪数据库查询模型设计表单处理 datefield 用户记录

如何在Django ORM中查询特定日期（DateField）

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