Django自动生成选择字段的选择

问题描述

我有一个表单（forms.Form）自动生成自己的选择字段的选择：

I have a form (forms.Form) that automatically generates the choices for its own choicefield as such:

class UserForm(forms.Form):
    def generate_choices():
        from vn.account.models import UserProfile
        up = UserProfile.objects.filter(user__isnull=True)
        choices = [('0','--')]
        choices += ([(s.id ,'%s %s (%s), username: %s, email: %s' % (s.first_name, s.last_name, s.company_name, s.username, s.email)) for s in up])
        return choices

    user = forms.ChoiceField(label=_('Select from interest form'), choices=generate_choices())

我的问题是，这显示为选择框（如意图），但其内容以某种方式进行缓存。在我重新启动本地PC上的dev服务器或远程服务器上的apache之前，新条目不会显示。

My problem is that this shows up as a select box (as intented) but its contents are cached somehow. New entries do not show up before i restart the dev server on my local pc, or apache on the remote server.

该代码何时被评估？我如何做到这一点，以便每次重新计算条目？

When is that piece of code evaluated? How can i make it so that it re-calculates the entries every time ?

PS。 memchached和其他类型的缓存被关闭。

PS. memchached and other sorts of caching are turned off.

推荐答案

我认为你需要通过init来做到这一点，表单被调用，像

I think you need to do this via the init so it is evaluate when form is called, something like

例如

def __init__(self, *args, **kwargs):
    super(UserForm, self).__init__(*args, **kwargs)
    from vn.account.models import UserProfile
    up = UserProfile.objects.filter(user__isnull=True)
    choices = [('0','--')]
    choices += ([(s.id ,'%s %s (%s), username: %s, email: %s' % (s.first_name, s.last_name,s.company_name, s.username, s.email)) for s in up])

    self.fields['user'].choices = choices

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