Django在创建或更新模型时显示不同的形式

from django.db import models

class Article(models.Model):
    title = models.CharField(max_length=100)
    content = models.TextField()

from django import forms
from .models import Article

class ArticleForm(forms.ModelForm):
    class Meta:
        model = Article
        fields = ['title', 'content']

from django.shortcuts import render, get_object_or_404, redirect
from .forms import ArticleForm
from .models import Article

def create_article(request):
    if request.method == 'POST':
        form = ArticleForm(request.POST)
        if form.is_valid():
            form.save()
            return redirect('article_list')
    else:
        form = ArticleForm()
    return render(request, 'create_article.html', {'form': form})

def update_article(request, article_id):
    article = get_object_or_404(Article, id=article_id)
    if request.method == 'POST':
        form = ArticleForm(request.POST, instance=article)
        if form.is_valid():
            form.save()
            return redirect('article_list')
    else:
        form = ArticleForm(instance=article)
    return render(request, 'update_article.html', {'form': form, 'article': article})