Django save method

THe 'save()' method

• save(commit=False)
  • Create, but don't save the new instance.
  • 아직 데이터베이스에 저장되지 않은 인스턴스를 반환
  • 저장하기 전에 객체에 대한 사용자 지정 처리를 수행할 때 유용하게 사용

Comment CREATE

@require_POST
def comments_create(request,pk) :
    article = Article.objects.get(pk=pk)
    comment_form = CommentForm(request.POST)
    if comment_form.is_valid() :
        # commit의 기본값은 true이다. commit을 False로 바꿔서 DB에 저장은 안하고 인스턴스는 만들어줌 
        comment = comment_form.save(commit=False)
        # 누락된 article입력 해주고 
        comment.article = article
        #세이브 해줌 
        comment.save()
    return redirect('articles:detail',article.pk)

Comment READ

@require_safe
def detail(request, pk):
    # article = Article.objects.get(pk=pk)
    # 객체가 있으면 객체를 없으면 404에러를 담아서 반환 
    article = get_object_or_404(Article,pk=pk)
    comment_form = CommentForm()
    # 조회한 article에 모든 댓글을 조회 
    comments = article.comment_set.all()
    context = {
        'article': article,
        'comment_form' : comment_form,
        'comments' : comments
    }
    return render(request, 'articles/detail.html', context)

Commnet DELETE

#urls.py
path('<int:article_pk>/comments/<int:comment_pk>/delete/',views.comments_delete,
    name='comments_delete')
#views.py
def comments_delete(request,article_pk,comment_pk) :
    comment = Comment.objects.get(pk=comment_pk)
    # article_pk = comment.article.pk
    comment.delete()
    return redirect('articles:detail',article_pk)