Django 1.8 set exist default value of Update form - django

Question

I wrote template
<div class="container">
<form action="" method="post">
{% csrf_token %}
{{ form.as_p }}
<input type="submit">
</form>
</div>
And, my View is below
class UserProfileUpdateView(UpdateView):
model = UserProfile
form_class = UserProfileUpdateForm
template_name_suffix = '_update_form'
And this is my UserProfile model below.
It uses User key
class UserProfile(models.Model):
# This line is required. Links UserProfile to a User model instance.
user = models.OneToOneField(User)
# The additional attributes we wish to include.
website = models.URLField(blank=True, verbose_name=u'Webサイト')
picture = models.ImageField(
upload_to='uploads/profile_images/%Y/%m/%d', blank=True,
null=True, verbose_name=u'Image'
)
age = models.IntegerField(verbose_name=u'Age')
country = models.CharField(max_length=30, verbose_name=u'country')
profile = models.CharField(max_length=300, verbose_name=u'profile')
address = models.CharField(max_length=300, verbose_name=u'address')
GENDER_CHOICES = (
(u'M', u'Male'),
(u'F', u'Female'),
)
gender = models.CharField(max_length=2, choices=GENDER_CHOICES, verbose_name=u'Gender')
CATEGORY_CHOICES = (
(u'U', u'u'),
(u'R', u'r'),
)
category = models.CharField(max_length=2, choices=CATEGORY_CHOICES, verbose_name=u'category')
last_accessed = models.DateTimeField()
My Form is
class UserProfileUpdateForm(forms.ModelForm):
slug_field = 'user_slug'
class Meta:
model = UserProfile
fields = (
'address', 'profile', 'gender', 'category',
'age',
'website', 'picture',
)
But, my form can't fill default value which already set before.
Could you tell me why doesn't set?

Answer 1

You should look at this: Django: using ModelForm to edit existing database entry
The key is:
form = MyModelForm(instance=MyModel.objects.get(pk=some_id))