大家好，我是新来的，我现在正在学习django。抱歉，如果我的问题不够精确，但是我真的不知道该怎么称呼。这是我的代码：
库存/models.py
class Category(models.Model):
name = models.CharField(max_length=40)
class Product(models.Model):
category = models.ForeignKey(Category)
sale_price = models.DecimalField(max_digits=8, decimal_places=2, default=0.00)
#...
发票/models.py
from inventory.models import Product
class Invoice(models.Model):
#...
class Row(models.Model):
invoice = models.ForeignKey(Invoice)
single_price = models.DecimalField(max_digits=8, decimal_places=2, default=0.00)
#...
class InventoryRow(Row):
product = models.ForeignKey(Product)
def __unicode__(self):
return self.product.name
发票/forms.py
class InvoiceForm(ModelForm):
class Meta:
model = Invoice
class InventoryRowForm(ModelForm):
class Meta:
model = InventoryRow
fields = ('product')
发票/view.py
def invoice(request):
TableFormSet = formset_factory(InventoryRowForm, extra=6)
if request.method == 'POST':
invoice_form = InvoiceForm(request.POST)
table_formset = TableFormSet(request.POST)
if invoice_form.is_valid() and table_formset.is_valid():
invoice = invoice_form.save(commit=False)
#...
invoice.save()
for form in table_formset.forms:
t = form.save(commit=False)
print t.product.sale_price
t.single_price = t.product.sale_price
t.invoice = invoice
#...
t.save()
#From this place code doesn't execute
return redirect('invoices:index')
else:
invoice_form = InvoiceForm()
table_formset = TableFormSet()
context = {
'invoice_form': invoice_form,
'table_formset': table_formset,
}
context.update(csrf(request))
return render(request, 'invoices/invoice.html', context)
当我填写并发送表单时，出现HTTP错误500，异常类型：DoesNotExist和异常值：InventoryRow没有产品。调试模式还为我突出显示了分配为“ t.single_price = t.product.sale_price”的行，这让我感到惊讶，我可以将t.product.sale_price的值打印到控制台，它是正确的，并且保存了我的表格。有人知道为什么会这样吗？
Environment:
Request Method: POST
Request URL: http://192.168.0.104:8000/invoices/new/invoice
Django Version: 1.6.1
Python Version: 2.7.5
Installed Applications:
('django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'bootstrap_toolkit',
'bootstrapform',
'inventory',
'invoices')
Installed Middleware:
('django.contrib.sessions.middleware.SessionMiddleware',
'django.middleware.common.CommonMiddleware',
'django.middleware.csrf.CsrfViewMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
'django.contrib.messages.middleware.MessageMiddleware',
'django.middleware.clickjacking.XFrameOptionsMiddleware')
Traceback:
File "/Users/novirael/PythonEnvs/BMSEnv/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response
114. response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/Users/novirael/PythonEnvs/BMSEnv/lib/python2.7/site-packages/django/contrib/auth/decorators.py" in _wrapped_view
22. return view_func(request, *args, **kwargs)
File "/Users/novirael/PythonEnvs/BMSEnv/bms/invoices/views.py" in invoice
74. t.single_price = t.product.sale_price
File "/Users/novirael/PythonEnvs/BMSEnv/lib/python2.7/site-packages/django/db/models/fields/related.py" in __get__
324. "%s has no %s." % (self.field.model.__name__, self.field.name))
Exception Type: DoesNotExist at /invoices/new/invoice
Exception Value: InventoryRow has no product.
您只是进入表单集中的空表单。
您认为：
TableFormSet = formset_factory(InventoryRowForm, extra=6)
每次您点击此视图时，都会创建一个包含六个额外的空表单的表单集。然后，在您的for循环的后面，对的调用form.save(commit=False)将不会返回InventoryRow带有关联Product对象的，因此DoesNotExist当您稍后尝试访问时会出现错误product.sale_price。
您应该添加一个if以检查表单是否“绑定” [1]：
for form in table_formset.forms:
if form.is_bound:
t = form.save(commit=False)
t.single_price = t.product.sale_price
t.invoice = invoice
#...
t.save()
[1]此处提供有关“绑定表单”的更多信息：https : //docs.djangoproject.com/en/dev/ref/forms/api/#bound-and-unbound-forms
本文收集自互联网，转载请注明来源。
如有侵权，请联系[email protected] 删除。
我来说两句