在 Django 中编辑表单会创建新实例

Question

我正在编辑表单，当我点击保存时它会正确加载数据，它会在数据库中创建新条目。

这里是视图函数

def create_account(request):


    if request.method == 'POST': # If the form has been submitted...
        form = AccountForm(request.POST, request.FILES) # A form bound to the POST data
        if form.is_valid(): # All validation rules pass
                form.save()
                return HttpResponseRedirect('/thanks/') # Redirect after POST
    else:
        form = AccountForm() # An unbound form

    return render_to_response('account_form.html', {
            'form': form,
    })

--

def edit_account(request, acc_id):

    f = Account.objects.get(pk=acc_id)
    if request.method == 'POST': # If the form has been submitted...
        form = AccountForm(request.POST, request.FILES) # A form bound to the POST data
        if form.is_valid(): # All validation rules pass
                form.save()
                return HttpResponseRedirect('/thanks/') # Redirect after POST
    else:
        form = AccountForm(instance=f) # An unbound form

    return render_to_response('account_form.html', {
            'form': form,
    })

我真的需要单独的编辑功能和单独的删除功能吗？我可以在一个功能中完成所有操作吗

模板

    <form action="/account/" method="post" enctype="multipart/form-data" >
    {% csrf_token %}
    {% for field in form %}
        <div class="fieldWrapper">
            {{ field.errors }}
            {{ field.label_tag }}: {{ field }}
        </div>
    {% endfor %}
    <p><input type="submit" value="Send message" /></p>
    </form>

Answer 1

你尝试过这样的事情吗？

 # Create a form to edit an existing Object.
     a = Account.objects.get(pk=1)
     f = AccountForm(instance=a)
     f.save()

# Create a form to edit an existing Article, but use
# POST data to populate the form.
    a = Article.objects.get(pk=1)
    f = ArticleForm(request.POST, instance=a)
    f.save()

Answer 2

您在POST 部分缺少instance 参数。

而不是这个：

form = AccountForm(request.POST, request.FILES) # A form bound to the POST data

你应该使用这个：

form = AccountForm(request.POST, request.FILES, instance=f) # A form bound to the POST data

将其添加到添加/编辑表单后，您将能够同时添加/编辑。

如果instance=None 将添加，如果instance 是实际帐户，则会更新。

def edit_account(request, acc_id=None):
    if acc_id:
        f = Account.objects.get(pk=acc_id)
    else:
        f = None

    if request.method == 'POST': # If the form has been submitted...
        form = AccountForm(request.POST, request.FILES, instance=f) # A form bound to the POST data
        if form.is_valid(): # All validation rules pass
            form.save()
            return HttpResponseRedirect('/thanks/') # Redirect after POST
    else:
        form = AccountForm(instance=f) # An unbound form

    return render_to_response('account_form.html', {
        'form': form,
    })