如何在django模板和表單中使用外鍵？

Question

我有一個特殊的表單代表我一個數據列表，但問題是它工作得非常慢，所以有什么類似django autocomplete_fields表單？

我的表格：

class TripSearchForm(forms.Form):
    departure = forms.ModelChoiceField(queryset=Place.objects.places_for_segment())
    destination = forms.ModelChoiceField(queryset=Place.objects.places_for_segment())

 def places_for_segment(self):
        return Place.objects.filter(Q(role=Place.CITY) | Q(role=Place.VILLAGE) | Q(role=Place.TOWN))

Answer 1

作為第一種方法，您可以嘗試使用select_related來預取外鍵

def places_for_segment(self):
    return Place.objects.filter(
        Q(role=Place.CITY) \
        | Q(role=Place.VILLAGE) \
        | Q(role=Place.TOWN)
     ).select_related('name_of_the_foreign_key', 'another_foreign_key')