Question

所以我有这些模型：

Bands(models.Model):
    mgmt = models.ForeignKey(User)
    name = models.Charfield(max_length=200)

Contracts(models.Model):
    band = models.ForeignKey(Bands)
    start_date= models.DateField()

BookedGig(models.Model):
    for  = models.ForeignKey(Bands)
    under= models.ForeignKey(Contracts)
    date = models.DateField()

我如何在views.py文件中构建一些东西来捕获用户的所有BookedGigs？我的目标只是通过模板显示，标题下的各种演出联系人/条。

在views.py中的

我目前有

def Home(request):
    user = request.user
    bands = Bands.objects.filter(mgmt=user).order_by('name') 
        #This will give me the bands belonging to a user
    contracts = Contracts.filter(band=bands)
        #But here bands is not one value but a queryset.

    #if I try
    contracts = bands.booked_gig_set.all() 
    I get 'QuerySet' object has no attribute 'booked_gig_set'

模板：我知道这是错的，但这就是我要显示列表的方式。

{% for b in bands %}
    Band:{{b.name}}
    {% for c in contracts %}
        Contract Start:{{c.start_date}}
        {% for g in gigs %}
            {{g.dates}}
        {% endfor %}
    {% endfor %}
{% endfor %}

由于

Answer 1

 Contracts.objects.filter(band__in=bands)

你可能想在那里添加一个prefetch_related statement来预取演出，否则你的模板循环会在每个合约中命中一次。

 contracts = Contracts.objects.filter(band__in=bands).prefetch_related()

Django，按多个值过滤

1 个答案: