About Django form issues
First give models.py and forms.py

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Give the code of views.py again

def articleUpdate(request, articleId): ''' Update the article instance: 1. Get the article to update; redirect to 404 if not found 2. Render a bound form if the method is GET 3. If the form is valid, save it to the model, otherwise render a bound form with error messages ''' articleToUpdate = get_object_or_404( Article, id=articleId) template = 'article/articleCreateUpdate.html' if request.method == 'GET': print(ArticleForm(instance=articleToUpdate)) articleForm = ArticleForm(instance=articleToUpdate) return render(request, template, {'articleForm':articleForm, 'article':articleToUpdate}) # POST articleForm = ArticleForm(request.POST, instance=articleToUpdate) if not articleForm.is_valid(): return render(request, template, {'articleForm':articleForm, 'article':articleToUpdate}) articleForm.save() messages.success(request, '文章已修改') return redirect('article:articleRead', articleId=articleId) def commentCreate(request, articleId): ''' Create a new article instance 1. If method is GET, render an empty form 2 . If method is POST, perform form validation. Display error messages if the form is invalid 3. Save the form to the model and redirect to the article page ''' template = 'article/commentCreate.html' articleToUpdate = get_object_or_404( Article, id=articleId) if request.method == 'GET': return render(request, template,{'commentForm':CommentForm(), 'article':articleToUpdate}) # POST commentForm = CommentForm(request.POST, instance=articleToUpdate) if not commentForm.is_valid(): return render(request, template, {'commentForm':commentForm(), 'article':articleToUpdate}) commentForm.save() messages.success(request,'留言已新增') return redirect('article:articleRead',articleId=articleId)

The two methods are almost the same, they both use forms, but the forms I use are not the same type. One is ArticleForm and the other is CommentForm, but the result appears in views: commentCreate. Its effect is Equal to articleUpdate,means adding a comment becomes modifying the article content