django form data not saving to database

Hi everyone!

I am creating a simple webapp using django where a user can login, choose one of the given category and create a post under the chosen category.

I am having trouble in creating a post. When I create a  new post through django form the date isn't saved to database. I log in to the django-admin to check if the post is created but the 'post' table remains empty.
 
Here are the necessary code snippets:

"Category model"
class  Category(models.Model):
   
    name = models.CharField(max_length=128,unique=True)
    slug = models.SlugField()
    def save(self,*args,**kwargs):
        self.slug = slugify(self.name)
        super(Category,self).save(*args,**kwargs)

    def __unicode__(self):
        return self.name
   
"Post Model"
class Post(models.Model):
    category = models.OneToOneField(Category,default='category')
    title = models.CharField(max_length=128,null=True)
    content = models.TextField(blank=True,null=True)   
   
    def __unicode__(self):
        return self.title

"Postform/forms.py"

class PostForm(forms.ModelForm):
    title = forms.CharField(max_length=128)
    content = forms.CharField(widget=forms.Textarea)
    class Meta:
        model = Post
        fields = ('title','content')

"create_post function/views.py"

def create_post(request,category_name_slug):
   
    created = False
    instance = get_object_or_404(Category,slug=category_name_slug)
    if request.method == 'POST':
        form = PostForm(data=request.POST or None,instance=instance)
        if form.is_valid():
            post = form.save(commit=False)
            post.save()
            created = True
        else:
            print form.errors
    else:
        form = PostForm()
    context={
        'form':form,
        'instance':instance,       
        'created':created
    }
    return render(request,"add_post.html",context)


Any solution??

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