Django模型表单编辑模板未填充值

Question

我有一个模型表单（ModelForm），我已经创建了一个视图和模板，用来往数据库里添加数据。现在我想扩展这个功能，让用户点击一个按钮后可以编辑数据。但是当他们点击按钮后，表单/模板页面出现了，我却看到“这个字段是必填的”这样的提示，所有的字段都是空的，而不是我传入的实例的值。虽然我在修改这些值时，数据库里的相应数据会被正确更新，但问题是，虽然主键是传递过去了，但值却没有显示出来。如果有人能告诉我我哪里做错了，我会非常感激。另外，我是以这篇帖子为基础的：Django edit form based on add form?，所以请不要只把我送到那篇帖子去。

以下是我的文件

模型表单

class CreditCardForm(forms.ModelForm):
class Meta:
    model = CreditCard
    fields = ('name_on_card','card_number','contact_number_on_card')

视图

def edit(request, id=None, template_name='article_edit_template.html'):
if id:
    print "Edit Mode"
    card = get_object_or_404(CreditCard, pk=id)
    if card.card_owner != request.user:
        raise HttpResponseForbidden()
else:
    print "Create Mode"
    card = CreditCard(card_owner=request.user)

if request.POST:
    print "request.POST"
    form = CreditCardForm(request.POST, instance=card)
    if form.is_valid():
        print "is_valid()"
        form.save()

        # If the save was successful, redirect to another page
        # redirect_url = reverse(article_save_success)
        return HttpResponseRedirect('/cards/')
else:
    print "else"
    form = CreditCardForm(instance=card)

return render_to_response(
    'create_credit.html', 
    {'form': form,},
    context_instance=RequestContext(request)
)

模板

{% include "base.html" %}

<form action="" method="post">{% csrf_token %}
<fieldset>
<legend>Required</legend>

<div class="fieldWrapper">
    {{ form.name_on_card.errors }}
    <label for="id_topic">Name as it appears on card:</label>
    {{ form.name_on_card }}
</div>
<div class="fieldWrapper">
    {{ form.card_number.errors }}
    <label for="id_topic">Last 6 digits of card number:</label>
    {{ form.card_number }}
</div>  
</fieldset>

<fieldset>
<legend>Optional</legend>
<!-- This is for Credit Card's Only -->
<div class="fieldWrapper">
    {{ form.contact_number_on_card.errors }}
    <label for="id_topic">Institution contact number: 1-</label>
    {{ form.contact_number_on_card }}
</div>
</fieldset>
<p><input type="submit" value="Save"></p>
</form>

URL

    url(r'^new/credit/$', views.edit, {}, 'crds_newCredit'),
url(r'^edit/credit/(?P<id>\d+)/$', views.edit, {}, 'crds_editCredit'),

数据库 django 表单验证模板渲染视图函数 modelform 编辑功能实例数据

Django模型表单编辑模板未填充值

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