Python 如果没有，则自动使用值填充django模型字段

我试图自动填充我的注释模型的注释器字段，但没有填充由“Anon”和注释主键组成的字符串值（我认为应该在django中自动生成）。我试图通过重写save（）函数来实现这一点。这是我的模型代码

from django.db import models
from django.contrib.auth.models import User
from ckeditor.fields import RichTextField
from imagekit.models import ProcessedImageField, ImageSpecField
from imagekit.processors import ResizeToFill

# Create your models here.

STATUS = (
    (0, "Draft"),
    (1, "Publish")
)

class Post(models.Model):
    title = models.CharField(max_length=200, unique=True)
    slug = models.SlugField(max_length=200, unique=True)
    cover_image = ProcessedImageField(upload_to='images/%Y/%m/%d/',
                                      blank=True,
                                      null=True,
                                      processors=[ResizeToFill(250, 250)],
                                      format='JPEG',
                                      options={'quality': 90})
    author = models.ForeignKey(User, on_delete= models.CASCADE, related_name='blog_posts')
    updated_on = models.DateTimeField(auto_now=True)
    content = RichTextField()
    created_on = models.DateTimeField(auto_now_add=True)
    status = models.IntegerField(choices=STATUS, default=0)

    class Meta:
        ordering = ['-created_on']
    
    def __str__(self):
        return self.title

class Comment(models.Model):
    post = models.ForeignKey(Post, on_delete=models.CASCADE, related_name="comments")
    created_on = models.DateTimeField(auto_now_add=True)
    commenter = models.CharField(max_length=20, blank=True, help_text="Fill this out, or don't")
    comment_content = models.TextField(max_length=300)
    active = models.BooleanField(default=False)

    class Meta:
        ordering = ['-created_on']
    
    def __str__(self):
        return f"Comment by {self.commenter} on {self.post}"

    def save(self, *args, **kwargs):
        if self.commenter == None:
            self.commenter = "Anon" + str(self.pk)
            return self.commenter
        else:
            super().save(*args, **kwargs)

如代码所示，如果未输入注释器字段，我将尝试使用字符串“Anon”+主键填充注释器字段。我正在基于功能的post_详细视图中保存注释。这是代码

from django.shortcuts import render, get_object_or_404
from django.views import generic
from .models import Post, Comment
from .forms import CommentForm

# Create your views here.
class HomePageView(generic.base.TemplateView):
    template_name = "main.html"

class PostList(generic.ListView):
    queryset = Post.objects.filter(status=1).order_by('-created_on')
    template_name = 'blog.html'

def post_detail(request, slug):
    template_name = 'post_detail.html'
    post = get_object_or_404(Post, slug=slug)
    comments = post.comments.filter(active=True)
    new_comment = None
    if request.method == 'POST':
        comment_form = CommentForm(data=request.POST)
        if comment_form.is_valid():
            new_comment = comment_form.save(commit=False)
            new_comment.post = post
            new_comment.save()
    else:
        comment_form = CommentForm()
    return render(request, template_name, {'post':post,
                                            'comments': comments,
                                            'new_comment': new_comment,
                                            'comment_form': comment_form})

感谢您的帮助。现在我的两个想法是，a。修改我的post_详细视图以合并逻辑，或b。在模型上设置默认值。我不确定正确的方法，因此非常感谢django向导的任何输入。谢谢所有能帮忙的人