键入对象＆＃x27; pizzamenu＆＃x27;没有属性＆＃x27; _default_manager＆＃x27;

Question

我尝试在模板上访问pizzadetailview时有以下错误：attributeError at/pizza/6/ 类型对象“ pizzamenu”没有属性'_default_manager'。

问题在哪里？

models.py

class PizzaMenu(models.Model):
    name = models.CharField(max_length=30)
    description = models.TextField()
    ingredients = models.CharField(max_length=100)
    price = models.DecimalField(max_digits=4, decimal_places=2)

    def __str__(self):
        return self.name

    class Meta:
        ordering = ["price"]

views.py

from django.views.generic import TemplateView, ListView, DetailView
from .models import PizzaMenu


class IndexView(TemplateView):
    template_name = "index.html"


class PizzaMenu(ListView):
    model = PizzaMenu
    template_name = "menu.html"
    context_object_name = "pizza_menu"

    # ordering = ["price"]


class PizzaDetailView(DetailView):
    model = PizzaMenu
    template_name = "pizza_detail.html"
    context_object_name = "pizza_detail"


class About(TemplateView):
    template_name = "about.html"

urls.py

from pizza.views import IndexView, PizzaMenu, About, PizzaDetailView

urlpatterns = [
    path("", IndexView.as_view(), name="home"),
    path("menu/", PizzaMenu.as_view(), name="menu"),
    path("about/", About.as_view(), name="about"),
    path("pizza/<int:pk>/", PizzaDetailView.as_view(), name="pizza_detail"),
    path("admin/", admin.site.urls),
]

Answer 1

不要命名您的视图pizzamenu，它将覆盖对其他视图的pizzamenu的引用。通常，基于班级的视图具有…查看后缀，因此：

class IndexView(TemplateView):
    template_name = 'index.html'


# add a View suffix to prevent collissions with the PizzaMenu model class
class PizzaMenuListView(ListView):
    model = PizzaMenu
    template_name = 'menu.html'
    context_object_name = 'pizza_menu'


class PizzaDetailView(DetailView):
    model = PizzaMenu
    template_name = 'pizza_detail.html'
    context_object_name = 'pizza_detail'


class AboutView(TemplateView):
    template_name = 'about.html'