articles_views.py

from django.shortcuts import get_object_or_404, render

from articles.forms import ArticleForm
from articles.models import Article


def article_edit(request, article_id):
    article = get_object_or_404(Article, pk=article_id)

    if request.method == 'POST':
        form = ArticleForm(request.POST, instance=article)
        if form.is_valid():
            form.save()
            return redirect('article_detail', article_id=article.pk)
    else:
        form = ArticleForm(instance=article)

    context = {
        'article': article,
        'form': form,
    }

    return render(request, 'articles/article_edit.html', context)