Question

我想根据三个用户输入过滤查询。离开城市，到达城市和日期。出发城市和到达城市位于同一个名为Route的桌子上，而TravelDate是Route中的外键。我的模特

 class TravelDate(models.Model):
    start_date = models.DateField(null = True)
    interval = models.IntegerField(null = True) 



class Route(models.Model): 
    depart_city = models.CharField(max_length=50, null=True, blank=False)
    arrive_city = models.CharField(max_length=50, null=True, blank=False)
    driver = models.ForeignKey(Driver)
    schedule = models.ForeignKey(Schedule)
    traveldate = models.ForeignKey(TravelDate)

我的观点

def newpage(request):
    if 'origin' in request.GET and request.GET['origin']:
        q = request.GET['origin']
        c = request.GET['dest']
        d = request.GET['travelDate']

        results = Route.objects.filter(depart_city=q, arrive_city=c)

        return render(request,'busapp/newpage.html', {'results': results})
    else:
        return render(request, 'busapp/newpage.html',{})

在视图中，如何根据用户输入过滤一个查询来过滤那些路线的depart_city，arrival_city和TravelDate。如果在该日期从城市A到城市B的公共汽车将通过执行类似if (d - TravelDate.start_date)% TravelDate.interval =0的操作来计算，然后将结果显示给用户。

我无法做到这一点。我是Django的新手并且正在努力学习。

Answer 1

将间隔保持为IntegerField

views.py

    from datetime import datetime, timedelta

    q = request.GET['origin']
    c = request.GET['dest']
    d = request.GET['travelDate']
    # d format is '20171122',convert str to date
    start_date = datetime.strptime(d, "%Y%m%d").date()
    results = Route.objects.filter(depart_city=q, arrive_city=c)
    routes = []
    for route in results:
        if (start_date > date) and ((start_date - route.traveldate.start_date) % timedelta(days=route.traveldate.interva)) == timedelta(days=0):
            routes.append(route)
    return render(request,'busapp/newpage.html', {'results': routes})

使用外键

1 个答案: