如何在基于 class 的视图中使用带有 id 参数的 get_queryset 中的每个特定外键项？

Question

首先，我对 django 非常陌生，感谢您的耐心等待，我想制作 web 网站，以展示联盟的立场并在这里展示特定球队的足球运动员我到目前为止所做的事情

模型.py

class League(models.Model):
    name = models.CharField(max_length=255)
    country = models.CharField(max_length=255)
    founded = models.DateField()

    def __str__(self):
        return self.name


class Team(models.Model):
    league = models.ForeignKey(
        League, blank=True, null=True, on_delete=models.CASCADE)
    image = models.ImageField(
        upload_to="images/", default='images/Wolves.png',  blank=True, null=True)
    name = models.CharField(max_length=255)
    win = models.IntegerField(blank=True, null=True)
    draw = models.IntegerField(blank=True, null=True)
    loss = models.IntegerField(blank=True, null=True)
    scored = models.IntegerField(blank=True, null=True)
    conceded = models.IntegerField(blank=True, null=True)
    founded = models.DateField(blank=True, null=True)

    games = models.IntegerField(blank=True, null=True)
    point = models.IntegerField(blank=True, null=True)
    average = models.IntegerField(blank=True, null=True)

    class Meta:
        ordering = [
            '-point', '-average'
        ]

    def __str__(self):
        return self.name

    def save(self, *args, **kwargs):
        self.games = self.win + self.draw + self.loss
        self.point = self.win*3 + self.draw
        self.average = self.scored - self.conceded
        super(Team, self).save(*args, **kwargs)

如果我使用 from slug item 而不是 id 那就太好了 让您轻松了解您所在的联赛

网址.py

urlpatterns = [
    path('', home, name='home'),
    path(r'^/league/(?P<id>\d+)/$', LeagueListView.as_view(), name='league'),
   

为了了解基于 class 的视图是什么，一旦在 th base.html的导航栏中单击，我应该以某种方式使用它们，它应该过滤相关联赛的球队

视图.py

class LeagueListView(ListView):
    model = Team
    template_name = "league.html"
    context_object_name = "teams_of_league"

    # def get_queryset(self, request, *args, **kwargs):
    # HERE I want to get teams of specific league and send to the league.html

底座.html

<ul class="navbar-nav me-auto">
                    <li class="nav-item active">
                    <a class="nav-link" href="{% url 'league' specific_teams %}">Premier League</a>
                    </li>
                    <li class="nav-item active">
                    <a class="nav-link" href="{% url 'league' specific_teams %}">La liga</a>
                    </li>
                    <li class="nav-item active">
                    <a class="nav-link" href="{% url 'league' specific_teams %}">League 1</a>
                    </li>
                </ul>

联赛.html

在这个文件中有对应联赛的表格，包括球队信息

先感谢您

Answer 1

网址.py

urlpatterns = [
    path('league/<id>', LeagueListView.as_view(), name='league'),
]

self.kwargs['id']获取传递给 url 的参数： https://example.com/league/2

在这种情况下，我们得到2 。

您可以查看Django 文档以获取更多参考。

这是您的代码应如下所示的示例：

class LeagueListView(ListView):
    model = Team
    template_name = "league.html"
    context_object_name = "teams_of_league"

    def get_queryset(self): 
        league_id = int(self.kwargs['id'])
        self.league = League.objects.filter(pk=league_id).first()

现在您有了self.league实例，您可以获取与该联赛相关的球队。

Answer 2

只需覆盖 get_context 方法

def get_context_data(self,**kwargs):
    context = super(LeagueListView,self).get_context_data(**kwargs)
    league = League.objects.get(slug=kwargs.get('slug')) 
    context['teams']  = Team.objects.filter(league_id=league.id) 
    return context