为什么 Django 中的 POST 请求有时有效而其他时间无效？（这几乎是随机的）

Question

我有一个 Django CRUD 网络应用程序，它基本上用于向数据库添加值，当页面刷新时，这些值在前端可见，并且有一个按钮可以编辑该条目。它在 90% 的时间里工作得很好。但是会有一个随机的实例，有人使用 UI 添加了一些东西，它被添加到数据库中，但是当刷新时，条目从数据库中消失了！这是我见过的最荒谬的事情。如果代码有问题，它不会永远不会正确添加它。我只是很困惑，为什么它在 90% 的时间里都能很好地增加值，但很少有条目消失的情况。

def index(request, user, created_by):
    if request.POST:
        print(request.POST)
        selected_user = request.POST.get('name_user')
        selected_project = request.POST.get('name_project')
        print(selected_user)
        week_starting = request.POST.get('date')
        hours = request.POST.get('hours')
        activity = request.POST.get('activity')
        selected_tag = request.POST.get('tag')
        # check if record already exists for the same user and same week_starting and selected_project
        # if not then insert to DB
        # else don't insert, say record already exists
        if selected_tag == '':
            check_if_exists = TABLENAME.objects.filter(username=selected_user,
                                                                             week_starting=week_starting,
                                                                             project_id=selected_project, tag_id__isnull=True)
        else:
            check_if_exists = TABLENAME.objects.filter(username=selected_user,
                                                                             week_starting=week_starting,
                                                                             project_id=selected_project,
                                                                             tag_id=selected_tag)
        count = check_if_exists.count()
        print("at insert")
        print("how many same records already exist: ", count)
        if count < 1:
            selected_project_id = TABLENAME.objects.only('project_id').get(
                project_id=request.POST.get('project'))
            print(selected_project)
            if selected_tag == '':
                TABLENAME.objects.create(username=selected_user, project_id=selected_project_id,
                                                               week_starting=week_starting, forecast_hours=hours,
                                                               description=activity,
                                                               created_on=timezone.now(), created_by=created_by)
                add_status = "added - no tag"
            else:
                TABLENAME.objects.create(toggl_username=selected_user,
                                                               project_id=selected_project_id,
                                                               week_starting=week_starting, forecast_hours=hours,
                                                               description=activity, tag_id=selected_tag,
                                                               created_on=timezone.now(), created_by=created_by)
                add_status = "added - with tag"
            flash_text = 'Record inserted'
            print(add_status)
            # selected_tag = 0
            return render(request, 'hello_v2.html',
                          {'flash_text': flash_text, 'users': users, 'selected_user': selected_user,
                           'projects': projects, 'date': date, 'tags': tags,
                           'selected_tag': selected_tag, 'selected_project': selected_project})
            # add if tag is not empty then pass tags like here else don't - do the same thing for ID
        else:
            flash_text = 'Record already exists'
            return render(request, 'hello_v2.html',
                          {'flash_text': flash_text, 'users': users, 'selected_user': selected_user,
                           'projects': projects, 'date': date, 'tags': tags, 'selected_tag': selected_tag,
                           'selected_project': selected_project})

    else:
        print("Loading page")
        print(date)
        selected_tag = request.GET.get('tag_id')
        return render(request, 'hello_v2.html', {'users': users, 'date': date, 'projects': projects, 'tags': tags, 'selected_tag': selected_tag})

我通过打印它们来跟踪 POST 请求，在条目从数据库中消失的情况下，我看不到打印的 POST 请求...所以我'我真的很困惑我还有一个编辑方法，允许用户编辑一个条目，有时当用户编辑一个条目然后它消失了，所以也许我在那里有问题？但这只是一些编辑导致的，而不是全部。

Answer 1

你应该这样检查请求。

def index(request, user, created_by):
    if request<b>.method == "POST":</b>
        print(request.POST)
        selected_user = reques</pre>

为什么 Django 中的 POST 请求有时有效而其他时间无效？（这几乎是随机的）

Why would POST requests in Django work sometimes and not the other times? (It's almost random)

python

django

post

crud

为什么 Django 中的 POST 请求有时有效而其他时间无效？ （这几乎是随机的）

Why would POST requests in Django work sometimes and not the other times? (It's almost random)

python

django

post

crud

为什么 Django 中的 POST 请求有时有效而其他时间无效？（这几乎是随机的）