Question

我正在尝试创建员工列表。我可以为该员工分配用户名，密码和电子邮件，也可以更新员工信息，我可以更新用户名，密码或电子邮件。我可以创建一个员工，同时创建用户名和密码以及更新员工信息，但在更改员工的用户名或密码或电子邮件时，会创建一个新用户。

这是我试过的

def edit_employee(request, id):
    instance = get_object_or_404(Employee, id=id)
    form = EmployeeForm(request.POST or None, instance=instance)
    if request.method == "POST" and form.is_valid():
        employee = Employee.objects.get(id=id)
        prev_username = employee.username
        username = form.cleaned_data['username']
        password = form.cleaned_data['password']
        email = form.cleaned_data['email']
        office_instance = OfficeSetup.objects.get(owner=request.user)
        form = form.save(commit=False)
        form.office = office_instance
        # change username or password or email if admin has done the changes in
        # those field
        try:
            user_instance = User.objects.get(username=prev_username)
            user_instance.username = username
            user_instance.set_password(password)
            user_instance.email = email
            form.save()
            user_instance.save()
        except User.DoesNotExist:
            messages.error(request, "Following User Does Not Exist!")
        except:
            user = User.objects.create_user(
                username=username, password=password, email=email)
            form.save()
            user.save()
            messages.success(request, "Thank you")
            return redirect('employee-list')
    messages.warning(request, "Error")
    context = {
        'form': form
    }
    return render(request, 'dashboard/hrm/employee.html', context)

编辑部分

def edit_employee(request, id):
    instance = get_object_or_404(Employee, id=id)
    form = EmployeeForm(request.POST or None, instance=instance)
    if request.method == "POST" and form.is_valid():
        employee = Employee.objects.get(id=id)
        prev_username = employee.username
        username = form.cleaned_data['username']
        password = form.cleaned_data['password']
        email = form.cleaned_data['email']
        office_instance = OfficeSetup.objects.get(owner=request.user)
        form = form.save(commit=False)
        form.office = office_instance
        # change username or password or email if admin has done the changes in
        # those field
        user, created = User.objects.get_or_create(username=prev_username)
        if created:
            user.set_password(password)
            user.email = email
            form.save()
            user.save()
            return redirect('employee-list')
        user.set_password(password)
        user.email = email
        form.save()
        user.save()
        return redirect('employee-list')
    messages.warning(request, "Error")
    context = {
        'form': form
    }
    return render(request, 'dashboard/hrm/employee.html', context)

屏幕截图是为了使流程或用例清晰

更新代码

public async Task CopyDatabaseIfNotExists(string dbPath)
{
    var nExpectedFolder = IsolatedStorageFile.GetUserStoreForApplication();

            try
            {
                await ApplicationData.Current.LocalFolder.GetFileAsync(dbPath); //nExpectedFolder.GetFileAsync(dbPath);/// ApplicationData.Current.LocalFolder.GetFileAsync("preinstalledDB.db");
                // No exception means it exists
                return;
            }
            catch (System.IO.FileNotFoundException)
            {
                // The file obviously doesn't exist
            }

        (... some other stuff)

Answer 1

get_or_create方法适用于此类情况。我会重构做这样的事情：

user, created = User.objects.get_or_create(username=username)

if created:
    # Fields to only populated on creation
    user.password = password
    ...etc...

# Fields to update on creation or update
user.email = email
...etc...
user.save()

详细信息：https://docs.djangoproject.com/en/1.11/ref/models/querysets/#get-or-create

祝你好运！

创建新用户名而不是更新

1 个答案: