将请求实例用作obj的临时容器。重写内联方法formfield_for_foreignkey来修改查询集。这至少在Django 1.2.3上有效。
class RoomInline(admin.TabularInline): model = Room def formfield_for_foreignkey(self, db_field, request=None, **kwargs): field = super(RoomInline, self).formfield_for_foreignkey(db_field, request, **kwargs) if db_field.name == 'inside_room': if request._obj_ is not None: field.queryset = field.queryset.filter(building__exact = request._obj_) else: field.queryset = field.queryset.none() return fieldclass BuildingAdmin(admin.ModelAdmin): inlines = (RoomInline,) def get_form(self, request, obj=None, **kwargs): # just save obj reference for future processing in Inline request._obj_ = obj return super(BuildingAdmin, self).get_form(request, obj, **kwargs)
