在分配前引用的Django'局部变量'形式'需要帮助'

Question

我在django有问题.我在我的应用程序中创建了一个表单,我可以在其中详细了解客户端.现在我想创建一个允许我编辑表单的表单.但是当我转到/ index/edit_client/1时遇到一些问题,我收到此错误.

local variable 'form' referenced before assignment

我不知道为什么我有这个错误的原因,但从我所看到的,它没有帮助,除非当然还有另一种方法如何创建编辑表单来编辑客户端表单.以下是一些可能有用的输出.

# urls.py
    urlpatterns = patterns('',
    (r'^index/$', login_required(direct_to_template), { 'template': 'index.html' }),
    (r'^index/clients/$', client_info),
    (r'^index/clients_details/(?P<id>\d+)/$', clients_details),
    (r'^index/edit_client/(?P<id>\d+)/$', edit_client),
)

# views.py
@login_required 
def edit_client(request, id=1):
    clients_list = Client.objects.filter(pk=id)  
    if request.method == 'POST':
        form = ClientForm(request.POST or None)
        if form.is_valid():
            form.save()
            return HttpResponseRedirect('/index/clients/')
        else: form = ClientForm()
    return render_to_response('edit_client.html', {'form': form},  context_instance=RequestContext(request))

#edit_client.html
{% extends "base.html" %}

{% block content %}
<font face="verdana,news gothic,arial,heltevica,serif">
    <h3>Edit Client</h3>
</font>
<form method= "POST" action="">
    <font face="verdana,news gothic,arial,heltevica,serif">
    <div id="form">
        <table>
            {{form.as_table}}
        </table>
        <div align="center" STYLE=" margin-right:190px">
            <input type="submit" value="Submit" STYLE="background-color:#E8E8E8; color:#181818 "/>
        </div>
    </div>
</form>
{% endblock %}

Answer 1

这将始终运行:

return render_to_response('edit_client.html', {'form': form}

但如果request.method不是POST,则没有任何内容form.

固定代码:

@login_required 
def edit_client(request, id=1):
    clients_list = Client.objects.filter(pk=id)  
    form = ClientForm()
    if request.method == 'POST':
       form = ClientForm(request.POST or None)
       if form.is_valid():
           form.save()
           return HttpResponseRedirect('/index/clients/')
    return render_to_response('edit_client.html', {'form': form},  context_instance=RequestContext(request))