关注ModelForm文档并使用此模型：
class ShippingLabel(models.Model):
"""Record what shipping lables were printed list"""
class Meta:
db_table = 'shipping_labels'
ordering = ('client',)
verbose_name = _('shipping label')
verbose_name_plural = _('shipping labels')
LAYOUT_LASER_2x2 = "1"
LAYOUT_TICKET = "2"
LAYOUT_LASER_1x1 = "3"
LAYOUT_CHOICES = (
( LAYOUT_LASER_1x1, _("Laser (1x1 sheet)") ),
( LAYOUT_LASER_2x2, _("Laser (2x2 sheet)") ),
( LAYOUT_TICKET, _("Ticket (3-inch wide)") ),
)
client = models.ForeignKey(Company, blank=False, null=False, unique=True, help_text=_("Which Client to ship to?"), verbose_name=_("client") )
store = models.ForeignKey(Store, blank=False, null=False, help_text=_("What store info should be used? (address, logo, phone, etc)"), verbose_name=_("store") )
packages = models.CharField(_("Packages"), max_length=30, blank=False, null=False, help_text=_("Total number of packages. One label printed per package.") )
preprinted_form = models.BooleanField(_("Pre-Printed Form"), default=False, help_text=_("Are you using pre-printed shipping label stickers?"), )
layout = models.CharField(_("Record Type"), max_length=10, blank=False, null=False, choices=LAYOUT_CHOICES, default=LAYOUT_LASER_1x1, help_text=_("Print on large labels (4 per Letter page), Laser large labels (1 per page), or ticket printer?") )
added_by = models.CharField(_("Added By"), max_length=30, blank=True, null=True, help_text=_("The User that created this order.") )
date_added = models.DateTimeField(_('Date added'), auto_now_add=True)
date_modified = models.DateTimeField(_('Date modified'), auto_now=True)
def get_absolute_url(self):
return reverse('shipping:printship', args=[str(self.id)])
def __unicode__(self):
return unicode(self.client)
我按照他们的示例（manual_label.html）创建了此表单模板：
{% extends "admin/base_site.html" %}
{% load i18n %}
{% load staticfiles %}
{% block extrahead %}
{{ block.super}}
<script src="{{ STATIC_URL }}js/jquery-1.11.1.js"></script>
{% endblock %}
{% block content %}
<form id="manual_label" method="post" action="">
{% csrf_token %}
{% for hidden in form.hidden_fields %}
{{ hidden }}
{% endfor %}
<table>
{{ form.as_table }}
</table>
<input type="submit" value="generar etiquetas autoadhesivas"/>
</form>
<p>
</p>
{% endblock %}
我的应用urls.py：
from django.conf.urls import patterns, url
from shipping.views import printship, pcustomer, manual_label
urlpatterns = patterns('',
url(r'pcust/', pcustomer, name='pcustomer'),
url(r'mlabel/([0-9]+)/$', manual_label, name='manual_label'),
url(r'printlabel/([0-9]+)/$', printship, name='printship'),
)
我的观点（包含大量诊断记录）：
@login_required()
def manual_label(request, id):
logger.debug("SHIPPING.VIEWS.manual_label")
if request.method == 'POST':
logger.debug("SHIPPING.VIEWS.manual_label: POST!")
client = get_object_or_404(Company, pk=id)
labelset = ShippingLabel.objects.filter(client=client)
if len(labelset)>0:
# Pre-existing label, update it:
logger.debug("SHIPPING.VIEWS.manual_label.POST: Update a label!")
label = labelset[0]
form = ShipLabelForm(request.POST, instance=label)
else:
# New label:
logger.debug("SHIPPING.VIEWS.manual_label.POST: Save New label!")
form = ShipLabelForm(request.POST)
if form.is_valid():
logger.debug("SHIPPING.VIEWS.manual_label.POST: form is valid")
label = form.save(commit=True)
logger.debug("SHIPPING.VIEWS.manual_label.POST: label pk: " + str(label.id) )
logger.debug("SHIPPING.VIEWS.manual_label.POST: label client name: " + str(label.client.name) )
logger.debug("SHIPPING.VIEWS.manual_label: post return")
return HttpResponseRedirect(reverse('shipping:printship', args=[str(label.id)]))
else:
logger.debug("SHIPPING.VIEWS.manual_label: GET!")
client = get_object_or_404(Company, pk=id)
labelset = ShippingLabel.objects.filter(client=client)
if len(labelset)>0:
# Pre-existing label, load it:
logger.debug("SHIPPING.VIEWS.manual_label: Pre-Existing label, load it...")
label = labelset[0]
form = ShipLabelForm(instance=label)
else:
# New label:
label = ShippingLabel(client=client,
store=request.user.employee.store,
added_by=request.user.get_username())
form = ShipLabelForm(instance=label)
logger.debug("SHIPPING.VIEWS.manual_label: get return")
return render(request, 'shipping/manual_label.html', {
'title': u"Creación de etiquetas Manual Envios",
'form': form,
})
我的forms.py定义：
class ShipLabelForm(ModelForm):
class Meta:
model = ShippingLabel
localized_fields = '__all__'
fields = '__all__'
widgets = {
'added_by': HiddenInput,
'id': HiddenInput,
}
我添加了 ＆＃39; id＆＃39;：HiddenInput， 来尝试＆＃34;强制＆＃34;记录发送到表单的ID号，理论上我的错误发生是因为没有ID号，Django将验证＆＃34; ADD＆＃34;模式肯定会触发＆＃34; unique＆＃34;我在客户身上的旗帜。
manual_label 视图由客户选择表单调用，传入客户端ID。目标是在目前没有定义此客户的运输标签时生成ADD表单 - 这有效。
如果已经存在运输标签，我会预先加载表单及其数据。我认为表单系统会自动对现有记录进行更新。
在任何一种情况下，保存的运输标签记录都用于生成所需的运输标签。
这适用于管理视图（使用网站上的视图）。但我想给用户一个更简单的系统。这适用于 ADDing 新标签。但是，当我尝试编辑现有标签时，我收到表单验证错误＆＃34; 客户端已存在＆＃34; 。< / p>
这似乎很容易做到....
那么，我错过了什么错误？
答案 0 :(得分：1)
在POST和GET块中初始化表单时，您应该使用instance参数。