我在我的Django应用程序以下两个型号:Django的相关领域总是抛出生产完整性错误只
class BaseModel(models.Model):
"""
Base model
"""
uuid = models.UUIDField(default=uuid.uuid4, editable=False, primary_key=True)
created = models.DateTimeField(auto_now_add=True, null=True)
modified = models.DateTimeField(auto_now=True, null=True)
class Meta:
abstract = True
class BaseBillingModel(BaseModel):
"""
Base billing model with owner field and real_owner method (may reffer to Customer or Profile)
"""
owner = models.UUIDField() # uuid of Profile OR Customer
@property
def real_owner(self):
if self.type == 'customer':
return Customer.objects.get(uuid=self.owner)
if self.type == 'user':
return Profile.objects.get(uuid=self.owner)
class Meta:
abstract = True
class Invoice(BaseBillingModel):
type = models.CharField(_('Invoice type'), max_length=16, choices=INVOICE_PAYMENT_TYPES, default='user')
title = models.CharField(_("Title"), max_length=128, default="")
description = models.CharField(_("Description"), max_length=512, default="")
paid = models.BooleanField(_("Paid"), default=False)
cost = models.DecimalField(_("Total cost"), decimal_places=2, max_digits=10, default=Decimal("0"))
public = models.BooleanField(default=True)
def mark_paid(self):
self.paid = True
self.save()
class InvoiceItem(BaseModel):
invoice = models.ForeignKey(Invoice, null=True, blank=True)
cost = models.DecimalField(_("Cost"), decimal_places=2, max_digits=10, default=Decimal("0"))
quantity = models.IntegerField(_("Quantity"), default=1)
title = models.CharField(_("Title"), max_length=128, default="")
description = models.CharField(_("Description"), max_length=512, default="")
它基本上是有许多发票项发票模型。 我使用formset动态地添加/删除项目到发票。 当我发布Web表单时,我遍历项目并总计总成本,然后保存发票。
查看代码:
if request.method == 'POST':
invoice_form = InvoiceForm(request.POST)
formset = InvoiceItemFormset(request.POST)
total_forms = int(request.POST.get('form-TOTAL_FORMS'))
for x in range(total_forms):
identifier = "form-{x}-DELETE".format(x=x)
if identifier in request.POST:
deleted_items.append(x)
if request.POST.get('type') == 'customer':
invoice_form.fields['owner_choice'].choices = [(o.uuid.urn[9:],o.company_name) for o in Customer.objects.filter()]
if invoice_form.is_valid() and formset.is_valid():
invoice = invoice_form.save(commit=False)
invoice.owner = invoice_form.cleaned_data.get('owner_choice')
cost = Decimal(0)
for form in formset:
if form not in formset.deleted_forms:
item = form.save(commit=False)
item.invoice = invoice
item.save()
cost += item.cost * item.quantity
invoice.cost = cost
invoice.save()
它工作在我的本地环境(MariaDB的)的罚款,发票被所有项目创建的。 然而,舞台/生产服务器上它不,如果我使用MySQL的或 PostgreSQL的重要 - 我总是得到这样的错误: (PostgreSQL系统)
IntegrityError at /staff/billing/new_invoice
insert or update on table "core_invoiceitem" violates foreign key constraint "core_invoiceit_invoice_id_165c623e80fbe59c_fk_core_invoice_uuid"
DETAILS: Key (invoice_id)=(bb83ff7a-9428-458c-909f-6ab4fa24a1b3) is not present in table "core_invoice".
我不知道我该怎么解决这个问题。任何想法家伙?
但我需要先在发票上设置总成本。我在发票模型(保存后)中发出了一个信号,该信号以总成本向发票所有者发送电子邮件。我可以在不触发信号的情况下保存发票吗? 另外,为什么它在我的本地数据库上工作? – dease
您可以在将发票保存到数据库之前计算成本。听起来MariaDB可能没有检查外键约束(例如MyISAM引擎没有)。我没有MariaDB的任何经验,所以我不能告诉你为什么你没有在你的开发环境中得到错误。如果你已经吸引了一个'save()'的信号,我不认为你可以调用'save()'而不触发它。 – Alasdair