Python 找不到变量，即找不到键；VariableDoesnotexister at/genres/“；

我无法获取模板上与mptt django模型关联的对象。查找键[类型]失败。我有一个链接到另一个模型的模型。我使用mptt-django，以便通过多对多的关系连接对象。在管理面板上一切正常，但在模板上显示对象时会出现此问题。我应该做什么最好？可能我设置的对象周期不正确

型号。py:

from django.db import models
from django.urls import reverse
from django.utils import timezone
from mptt.models import MPTTModel, TreeForeignKey, TreeManyToManyField


class Genre(MPTTModel):
    name = models.CharField(max_length=50, unique=True, verbose_name='Подкатегория')
    slug = models.SlugField(max_length=200, null=True, blank=True, unique=True, verbose_name='Nazvanie_kategorii')
    parent = TreeForeignKey('self', on_delete=models.CASCADE, null=True, blank=True, related_name='children',
                            verbose_name='Категория')
    is_active = models.BooleanField(default=False, verbose_name='Активность категории')
    created = models.DateField(blank=True, null=True, default=timezone.now, verbose_name='Дата создания записи')
    updated = models.DateField(blank=True, null=True, default=timezone.now, verbose_name='Дата ред-ия записи')

    class MPTTMeta:
        order_insertion_by = ['name']
        verbose_name = 'Тест мптт'
        verbose_name_plural = 'Тест мптт'

    class Meta:
        verbose_name = 'Дерево категорий'
        verbose_name_plural = 'Дерево категорий'

    def __str__(self):
        return '%s' % self.name

    def get_absolute_url(self):
        return reverse('test_mptt:promotion_list_by_category', args=[self.slug])

from django.shortcuts import render, get_object_or_404
from .models import Genre, Promotion, PromotionDetails
from django.core.paginator import Paginator, EmptyPage, PageNotAnInteger


def show_genres(request, category_slug=None):
    category = None
    categories = Genre.objects.all()
    promotions = Promotion.objects.filter(is_active=True)
    if category_slug:
        category = get_object_or_404(Genre, slug=category_slug)
        promotions = promotions.filter(category=category)
    return render(request, "genre/list.html", {'category': category,
                                               'categories': categories,
                                               'promotions': promotions})

视图。py:

from django.db import models
from django.urls import reverse
from django.utils import timezone
from mptt.models import MPTTModel, TreeForeignKey, TreeManyToManyField


class Genre(MPTTModel):
    name = models.CharField(max_length=50, unique=True, verbose_name='Подкатегория')
    slug = models.SlugField(max_length=200, null=True, blank=True, unique=True, verbose_name='Nazvanie_kategorii')
    parent = TreeForeignKey('self', on_delete=models.CASCADE, null=True, blank=True, related_name='children',
                            verbose_name='Категория')
    is_active = models.BooleanField(default=False, verbose_name='Активность категории')
    created = models.DateField(blank=True, null=True, default=timezone.now, verbose_name='Дата создания записи')
    updated = models.DateField(blank=True, null=True, default=timezone.now, verbose_name='Дата ред-ия записи')

    class MPTTMeta:
        order_insertion_by = ['name']
        verbose_name = 'Тест мптт'
        verbose_name_plural = 'Тест мптт'

    class Meta:
        verbose_name = 'Дерево категорий'
        verbose_name_plural = 'Дерево категорий'

    def __str__(self):
        return '%s' % self.name

    def get_absolute_url(self):
        return reverse('test_mptt:promotion_list_by_category', args=[self.slug])

from django.shortcuts import render, get_object_or_404
from .models import Genre, Promotion, PromotionDetails
from django.core.paginator import Paginator, EmptyPage, PageNotAnInteger


def show_genres(request, category_slug=None):
    category = None
    categories = Genre.objects.all()
    promotions = Promotion.objects.filter(is_active=True)
    if category_slug:
        category = get_object_or_404(Genre, slug=category_slug)
        promotions = promotions.filter(category=category)
    return render(request, "genre/list.html", {'category': category,
                                               'categories': categories,
                                               'promotions': promotions})

html模板列表.html：（我已经导入了{%load mptt\U tags%}）

{%用于促销活动中的促销%}
{%if promotion.site%}
{%else%}


{%if promotion.schedule_start和promotion.schedule_end%}

{%endfor%}
{%如果不是node.is_leaf_node%}



{%endif%}

{%endrecursetree%}

错误日志：

---

html模板包含以下行：

{% recursetree genres %}

因此，模板希望看到名为

genres

的变量

在view函数中，您有以下渲染调用：

return render(request, "genre/list.html", {'category': category,
                                           'categories': categories,
                                           'promotions': promotions})

---

您没有将名为

genres

的变量传递给模板。

html模板包含以下行：

{% recursetree genres %}

因此，模板希望看到名为

genres

的变量

在view函数中，您有以下渲染调用：

return render(request, "genre/list.html", {'category': category,
                                           'categories': categories,
                                           'promotions': promotions})

---

您没有将名为

genres

的变量传递给模板。

天啊，我真讨厌自己。非常感谢你的提示！一切都变好了！{%recursetree categories%}天哪，我真恨自己。非常感谢你的提示！一切都变好了！{%recursetree类别%}