help with lambda in forms.py

I have a select box which has its options from a model called "Event". On my production server the result gets chached.

I need on every request the newest version of all Events in this select box. I asked in #django and someone said I should use lambda. I tried this with lambda but it doesn't work. Still get old values when I add a new Event only an apache restart show me the newest version.

Is there something wrong with my code?

#forms.py

events = lambda : [(e.id, e.title) for e in Event.objects.all().order_开发者_运维问答by('-date')]

class EventForm(Form):
    event_title = ChoiceField(label='Veranstaltung', choices=events())

Grrr... comment boxes give me very little room for editing. I'll try it here:

The workaround is to use the __init__ of the form, i.e.

class EventForm(Form):
    event_title = ChoiceField(label='Veranstaltung', choices=[])

    def __init__(self, *args, **kwargs):
        super(EventForm, self).__init__(*args, **kwargs)
        self.fields['events'].choices = [(e.id, e.title) for e in Event.objects.all().order_by('-date')]

By the way, did you consider using a ModelChoiceField?

THIS ANSWER WILL NOT WORK, see comments

You're evaluating the lambda, rendering it useless.

Drop the brackets like so:

event_title = ChoiceField(label='Veranstaltung', choices=events)

Good luck!