错误 AttributeError: 'str' object 在查询 model 时没有属性 'year'

Question

I get startdate and enddate, but they are passed as a string. How do I convert them to a date?

    startdate = request.POST["startdate"]
    enddate = request.POST["enddate"]
    queryset = paidparking.objects.all()
    qsstats = QuerySetStats(queryset, date_field='expirationdate')
    values = qsstats.time_series(startdate, enddate, interval='days')
    return render(request, 'index/template.html', {'values': values})

Error in: values = qsstats.time_series(startdate, enddate, interval='days')

Answer 1

startdate and enddate are strings , not datetime objects. You need to parse these, so something like:

from datetime import datetime

startdate = request.POST['startdate']
enddate = request.POST['enddate']
queryset = paidparking.objects.all()
qsstats = QuerySetStats(queryset, date_field='expirationdate')
values = qsstats.time_series(startdate, enddate, interval='days')
return render(request, 'index/template.html', {'values': values})

The format here ( '%Y-%m-%d' ) might be different, depending on how the date is formatted as string.

I would however advise to work with a Form [Djang-doc] . These forms make it convenient to parse, clean and validate input.