Question

我在迁移时遇到问题，当它最终运行时，它出现在主页上。其他一些页面也可以工作，它似乎只是主页。

错误消息：

Internal Server Error: /
Traceback (most recent call last):
File "C:\Users\pc\formula_zone\lib\site- 
 packages\django\core\handlers\exception.py", line 34, in inner
response = get_response(request)
File "C:\Users\pc\formula_zone\lib\site- 
packages\django\core\handlers\base.py", line 126, in _get_response
response = self.process_exception_by_middleware(e, request)
File "C:\Users\pc\formula_zone\lib\site- 
packages\django\core\handlers\base.py", line 124, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "C:\Users\pc\Downloads\formula_zone\mysite\racing\views.py", line 15, 
in racing_stats
ra = races[0]
File "C:\Users\pc\formula_zone\lib\site-packages\django\db\models\query.py", 
 line 303, in __getitem__
return qs._result_cache[0]
IndexError: list index out of range

我认为它在views.py上，所以这也是代码。

def racing_stats(request, race_id=None):
drivers = Driver.objects.all().order_by('lap_time')
races = Race.objects.all()
for racer in drivers:
    driver_controller.update_race_time(racer)

if race_id:
    ra = Race.objects.get(rac_id=race_id)
else:
    ra = races[0]

buttons = []
for r in races:
    buttons.append((r.rac_id, r.race_name))
context = {
    'drivers': drivers,
    'active_race': ra,
    'buttons': buttons
}
return render(request, 'racing/racing_stats.html', context)


def race_list(request):
races = Race.objects.all()

context = {
    'races': races,
}

return render(request, 'racing/races.html', context)


def race_detail(request, pk):
    race_ds = get_object_or_404(Race, pk=pk)
    print(race_ds)
    return render(request, 'racing/race_detail.html', 
    {'race_detail': race_ds})

Answer 1

尝试这样的事情：

ra = None
if race_id:
    ra = Race.objects.get(rac_id=race_id)
elif races:
    ra = races[0]

并且不要忘记在模板中处理None ra。

Django IndexError在/列表索引超出范围

1 个答案: