Question

我有一个html模板，我想在其中循环浏览模型（def main(): # Create an instance of Car my_car = Car("2008", "Honda Accord") print("my_car after instantiating:\n", my_car) my_car.setSpeed(2) print("my_car after my_car.setSpeed(2):\n", my_car) # Accelerate 5 times print ("car is accelerating: ") for i in range(5): #my_car.accelerate() print ("Current speed: ", my_car.getSpeed()) print() # Brake 7 times print ("car is braking: ") for i in range(7): #my_car.brake() print ("Current speed: ", my_car.getSpeed()) print("my_car values at program end:\n", my_car) main()）中的对象，这些对象由某个字段值（SpeciesPage）过滤并显示在列表中。筛选的结果跨越多个外键关系。最终，我希望模板循环并在单独的列表中显示多个过滤的结果，但是我无法获得任何内容来渲染一个过滤的列表的循环。我觉得我想要完成的事情应该很简单。

models.py（缩写为仅显示相关字段）

subfamily_name="Pierinae"

views.py

class Subfamily(models.Model):
    subfamily_name = models.CharField(max_length=200)

class Tribe(models.Model):
    subfamily = models.ForeignKey(Subfamily, on_delete=models.SET_NULL, null=True)
    tribe_name = models.CharField(max_length=200)

class Genus(models.Model):
    tribe = models.ForeignKey(Tribe, on_delete=models.SET_NULL, null=True)
    genus_name = models.CharField(max_length=200)

class Species(models.Model):
    genus = models.ForeignKey(Genus, on_delete=models.SET_NULL, null=True)
    species_name = models.CharField(max_length=200)
    species_page = models.OneToOneField('SpeciesPage', on_delete=models.SET_NULL, null=True)

class SpeciesPage(models.Model):
    title = models.CharField(max_length=100, primary_key=True)
    species_name = models.OneToOneField(Species, on_delete=models.SET_NULL, null=True)

speciespage_list.html

class SpeciesPageListView(generic.ListView):
    model = SpeciesPage
    template_name = 'speciespage_list.html'

def show(request):
    pierinae_pages = SpeciesPage.objects.filter(species_name__genus__tribe__subfamily__subfamily_name="Pierinae")

    context = {
        'pierinae_pages': pierinae_pages,
    }

    return render(request, 'speciespage_list.html', context=context)

为了解决我的问题，我从这里使用了以下答案：

任何帮助将不胜感激。谢谢！

Answer 1

事物的结合：

您不想将OneToOneField和Species都指向SpeciesPage。（有关详细信息，请参见https://docs.djangoproject.com/en/2.2/topics/db/examples/one_to_one/）

我认为您可以简化ListView以获得所需的输出：

class SpeciesPageListView(generic.ListView):
    model = SpeciesPage
    template_name = 'speciespage_list.html'
    queryset = SpeciesPage.objects.filter(species_name__genus__tribe__subfamily__subfamily_name="Pierinae")
    context_object_name = 'pierinae_pages'

，然后在urls.py中：

urlpatterns = [
    path('', views.SpeciesPageListView.as_view(), name='index'),
]

Django：遍历模板中的过滤列表

1 个答案: