django urls：默认值的可选参数总是None

Question

我有一个视图用于在我的数据库中插入/更新一个名为 BankAccounts 的 table ... 基本上如果 info_id 被传递给它的函数 edit/update 如果不是，它的默认值是 insert 操作

def bankcreate( requset , info_id = 0 ):

    print(' -----> id is ' + str(info_id))
    errors = []
    default = None

    if info_id is not None and info_id > 0 :
        try:
            default = BankAccounts.objects.get(id=info_id , user_id=requset.user.id)
        except BankAccounts.DoesNotExist :
            default = None


    if requset.POST :
        VALIDATIONRULES = {} # some rules here 
        data , errors = validation(requset , VALIDATIONRULES)

        if not errors :

            if info_id > 0 and  default is not None:
                ba = default
            else :
                ba = BankAccounts()

            ba.bank_accnumber = data['bank_accnumber']
            ba.bank_cartnumber = data['bank_cartnumber']
            ba.bank_shabanumber = data['bank_shabanumber']
            ba.bank_title  = data['bank_title']
            ba.user_id = requset.user.id
            ba.save()

            return redirect('account-bank')
        else:
            default = data

    return render(requset , 'account/bankcreate-form.html' ,
    {'default':default , 'errors':errors} )

因此，如您所见，无论是否使用 info_id，都应该可以访问该功能这是我的 rules.py

urlpatterns = [
    url(r'^$', views.index , name='account-home'),
    url(r'^edit$', views.edit , name='account-edit'),
    url(r'^bankinfo', views.bankinfo , name='account-bank'),
    url(r'^bankcreate/(?:/(?P<info_id>[1-9]+)/)?', views.bankcreate , name='account-bankcreate'),

]

如你所见，我正在尝试在最后一行写一个可选参数

url(r'^bankcreate/(?:/(?P<info_id>[1-9]+)/)?', views.bankcreate , name='account-bankcreate'),

但它不起作用......并且在函数的控制台上我得到 info_id 因为 None 没有事件定义的默认值 0......我做错了什么？

这是我的样品url

http://localhost:8000/account/bankcreate/1/

我都试过了

 url(r'^bankcreate/(?:/(?P<info_id>[1-9]+)/)?/$'

和

 url(r'^bankcreate/(?:/(?P<info_id>[1-9]+)/)?$'

但我遇到了这个错误

Page not found (404)
Request Method:     GET
Request URL:    http://localhost:8000/account/bankcreate/1/

Using the URLconf defined in paypal.urls, Django tried these URL patterns, in this order:

        ^$
        ^admin/
        ^account/ ^$ [name='account-home']
        ^account/ ^edit$ [name='account-edit']
        ^account/ ^email [name='account-email']
        ^account/ ^bankinfo [name='account-bank']
        ^account/ ^bankcreate/(?:/(?P<info_id>[1-9]+)/)?$ [name='account-bankcreate']
        ^account/ ^password [name='account-password']
        ^gateway/
        ^auth/

    The current URL, account/bankcreate/1/, didn't match any of these.

Answer 1

您的正则表达式（第二个）中有一个额外的斜杠。

改变

url(r'^bankcreate/(?:/(?P<info_id>[1-9]+)/)?$'

至

url(r'^bankcreate/(?:(?P<info_id>[1-9]+)/)?$'

django urls：默认值的可选参数总是None

django urls : optional argument with default value is always None

python

django

url-routing