Python Django:尝试在URL中使用Slug时出现404错误

我是一个初学者，通过构建一个名为PhoneReview的应用程序来学习Django。它将存储与最新手机相关的评论。它还将显示手机品牌，以及相关的手机型号和评论

当我转到时，我会看到以下页面：

当我点击三星时，我看到这个页面：

到现在为止还可以。 但当我点击任何型号的手机时，比如Galaxy S10，我会得到404错误。看起来是这样的：

Page not found (404)
Request Method: GET
Request URL:    http://127.0.0.1:8000/details/galaxy-s10
Raised by:  PhoneReview.views.ReviewView
No review found matching the query

You're seeing this error because you have DEBUG = True in your Django settings file. Change that to False, and Django will display a standard 404 page.

当我点击三星时，我应该会看到details.html页面，上面有对手机的评论以及新闻链接。相反，我得到的是404错误

以下是我在PhoneReview文件夹中的models.py的代码：

from django.db import models
from django.template.defaultfilters import slugify

# Create your models here.
class Brand(models.Model):
    brand_name = models.CharField(max_length=100)
    origin = models.CharField(max_length=100)
    manufacturing_since = models.CharField(max_length=100, null=True, blank=True)
    slug = models.SlugField(max_length=150, null=True, blank=True)

    def __str__(self):
        return self.brand_name

    def save(self, *args, **kwargs):
        self.slug = slugify(self.brand_name)
        super().save(*args, **kwargs)

class PhoneModel(models.Model):
    brand = models.ForeignKey(Brand, on_delete=models.CASCADE)
    model_name = models.CharField(max_length=100)
    launch_date = models.CharField(max_length=100)
    platform = models.CharField(max_length=100)
    slug = models.SlugField(max_length=150, null=True, blank=True)

    def __str__(self):
        return self.model_name

    def save(self, *args, **kwargs):
        self.slug = slugify(self.model_name)
        super().save(*args, **kwargs)

class Review(models.Model):
    phone_model = models.ManyToManyField(PhoneModel, related_name='reviews')
    review_article = models.TextField()
    date_published = models.DateField(auto_now=True)
    slug = models.SlugField(max_length=150, null=True, blank=True)
    link = models.TextField(max_length=150, null=True, blank=True)

    def __str__(self):
        return self.review_article

    def save(self, *args, **kwargs):
        self.slug = slugify(self.phone_model)
        super().save(*args, **kwargs)

from . import views
from django.urls import path

app_name = 'PhoneReview'

urlpatterns = [
    path('index', views.BrandListView.as_view(), name='brandlist'),
    path('phonemodel/<slug:slug>', views.ModelView.as_view(), name='modellist'),
    path('details/<slug:slug>', views.ReviewView.as_view(), name='details'),
]

from django.shortcuts import render, get_object_or_404
from django.views import generic
from .models import Brand, PhoneModel, Review


class BrandListView(generic.ListView):
    template_name = 'PhoneReview/index.html'
    context_object_name = 'all_brands'

    def get_queryset(self):
        return Brand.objects.all()


class ModelView(generic.ListView):
    template_name = 'PhoneReview/phonemodel.html'
    context_object_name = 'all_model_name'

    def get_queryset(self):
        self.brand = get_object_or_404(Brand, slug=self.kwargs['slug'])
        return PhoneModel.objects.filter(brand=self.brand)

class ReviewView(generic.DetailView):
    model = Review
    template_name = 'PhoneReview/details.html'

from django.apps import AppConfig


class PhonereviewConfig(AppConfig):
    name = 'PhoneReview'

以下是我在PhoneReview文件夹中的url.py的代码：

from django.db import models
from django.template.defaultfilters import slugify

# Create your models here.
class Brand(models.Model):
    brand_name = models.CharField(max_length=100)
    origin = models.CharField(max_length=100)
    manufacturing_since = models.CharField(max_length=100, null=True, blank=True)
    slug = models.SlugField(max_length=150, null=True, blank=True)

    def __str__(self):
        return self.brand_name

    def save(self, *args, **kwargs):
        self.slug = slugify(self.brand_name)
        super().save(*args, **kwargs)

class PhoneModel(models.Model):
    brand = models.ForeignKey(Brand, on_delete=models.CASCADE)
    model_name = models.CharField(max_length=100)
    launch_date = models.CharField(max_length=100)
    platform = models.CharField(max_length=100)
    slug = models.SlugField(max_length=150, null=True, blank=True)

    def __str__(self):
        return self.model_name

    def save(self, *args, **kwargs):
        self.slug = slugify(self.model_name)
        super().save(*args, **kwargs)

class Review(models.Model):
    phone_model = models.ManyToManyField(PhoneModel, related_name='reviews')
    review_article = models.TextField()
    date_published = models.DateField(auto_now=True)
    slug = models.SlugField(max_length=150, null=True, blank=True)
    link = models.TextField(max_length=150, null=True, blank=True)

    def __str__(self):
        return self.review_article

    def save(self, *args, **kwargs):
        self.slug = slugify(self.phone_model)
        super().save(*args, **kwargs)

from . import views
from django.urls import path

app_name = 'PhoneReview'

urlpatterns = [
    path('index', views.BrandListView.as_view(), name='brandlist'),
    path('phonemodel/<slug:slug>', views.ModelView.as_view(), name='modellist'),
    path('details/<slug:slug>', views.ReviewView.as_view(), name='details'),
]

from django.shortcuts import render, get_object_or_404
from django.views import generic
from .models import Brand, PhoneModel, Review


class BrandListView(generic.ListView):
    template_name = 'PhoneReview/index.html'
    context_object_name = 'all_brands'

    def get_queryset(self):
        return Brand.objects.all()


class ModelView(generic.ListView):
    template_name = 'PhoneReview/phonemodel.html'
    context_object_name = 'all_model_name'

    def get_queryset(self):
        self.brand = get_object_or_404(Brand, slug=self.kwargs['slug'])
        return PhoneModel.objects.filter(brand=self.brand)

class ReviewView(generic.DetailView):
    model = Review
    template_name = 'PhoneReview/details.html'

from django.apps import AppConfig


class PhonereviewConfig(AppConfig):
    name = 'PhoneReview'

以下是我在PhoneReview文件夹中的apps.py的代码：

from django.db import models
from django.template.defaultfilters import slugify

# Create your models here.
class Brand(models.Model):
    brand_name = models.CharField(max_length=100)
    origin = models.CharField(max_length=100)
    manufacturing_since = models.CharField(max_length=100, null=True, blank=True)
    slug = models.SlugField(max_length=150, null=True, blank=True)

    def __str__(self):
        return self.brand_name

    def save(self, *args, **kwargs):
        self.slug = slugify(self.brand_name)
        super().save(*args, **kwargs)

class PhoneModel(models.Model):
    brand = models.ForeignKey(Brand, on_delete=models.CASCADE)
    model_name = models.CharField(max_length=100)
    launch_date = models.CharField(max_length=100)
    platform = models.CharField(max_length=100)
    slug = models.SlugField(max_length=150, null=True, blank=True)

    def __str__(self):
        return self.model_name

    def save(self, *args, **kwargs):
        self.slug = slugify(self.model_name)
        super().save(*args, **kwargs)

class Review(models.Model):
    phone_model = models.ManyToManyField(PhoneModel, related_name='reviews')
    review_article = models.TextField()
    date_published = models.DateField(auto_now=True)
    slug = models.SlugField(max_length=150, null=True, blank=True)
    link = models.TextField(max_length=150, null=True, blank=True)

    def __str__(self):
        return self.review_article

    def save(self, *args, **kwargs):
        self.slug = slugify(self.phone_model)
        super().save(*args, **kwargs)

from . import views
from django.urls import path

app_name = 'PhoneReview'

urlpatterns = [
    path('index', views.BrandListView.as_view(), name='brandlist'),
    path('phonemodel/<slug:slug>', views.ModelView.as_view(), name='modellist'),
    path('details/<slug:slug>', views.ReviewView.as_view(), name='details'),
]

from django.shortcuts import render, get_object_or_404
from django.views import generic
from .models import Brand, PhoneModel, Review


class BrandListView(generic.ListView):
    template_name = 'PhoneReview/index.html'
    context_object_name = 'all_brands'

    def get_queryset(self):
        return Brand.objects.all()


class ModelView(generic.ListView):
    template_name = 'PhoneReview/phonemodel.html'
    context_object_name = 'all_model_name'

    def get_queryset(self):
        self.brand = get_object_or_404(Brand, slug=self.kwargs['slug'])
        return PhoneModel.objects.filter(brand=self.brand)

class ReviewView(generic.DetailView):
    model = Review
    template_name = 'PhoneReview/details.html'

from django.apps import AppConfig


class PhonereviewConfig(AppConfig):
    name = 'PhoneReview'

以下是我在templates文件夹中的index.html代码：

{% extends 'PhoneReview/base.html' %}

{% load static %}

{% block title%}
Brand List
{% endblock %}

{% block content %}
<!--Page content-->
<h1>This is Brand List Page</h1>
<h2>Here is the list of the brands</h2>
    <ul>
        {% for brand in all_brands %}
<!--            <li>{{ brand.brand_name }}</li>-->
            <li><a href = "{% url 'PhoneReview:modellist' brand.slug %}">{{ brand.brand_name }}</a></li>
        {% endfor %}
    </ul>
<img src="{% static "images/brandlist.jpg" %}" alt="Super Mario Odyssey" /> <!-- New line -->
{% endblock %}

{% extends 'PhoneReview/base.html' %}

{% load static %}

{% block title%}
Phone Model Page
{% endblock %}

{% block content %}
<!--Page content-->
<h1>This is Phone Model Page</h1>
<h2>Here is the phone model</h2>
    <ul>
        {% for phonemodel in all_model_name %}
            <li><a href = "{% url 'PhoneReview:details' phonemodel.slug %}">{{ phonemodel.model_name }}</a></li>
        {% endfor %}
    </ul>
<img src="{% static "images/brandlist.jpg" %}" alt="Super Mario Odyssey" /> <!-- New line -->
{% endblock %}

{% extends 'PhoneReview/base.html' %}
{% load static %}

<html>

<link rel="stylesheet" type="text/css" href="{% static "css/style.css" %}">


<html lang="en">

{% block title%}Details{% endblock %}

{% block content %}

<h1>This is the Details Page</h1>

<h2>Review:</h2>
<p>{{ review.review_article }}</p>

<h2>News Link:</h2>
<p>{{ review.link }}</p>
{% endblock %}
</html>

{%extends'PhoneReview/base.html%}
{%load static%}
{%block title%}
品牌列表
{%endblock%}
{%block content%}
这是品牌列表页面
这是品牌清单

{所有品牌中品牌的百分比%}

{%endfor%}

{%endblock%}

以下是我在templates文件夹中的phonemodel.html代码：

{% extends 'PhoneReview/base.html' %}

{% load static %}

{% block title%}
Brand List
{% endblock %}

{% block content %}
<!--Page content-->
<h1>This is Brand List Page</h1>
<h2>Here is the list of the brands</h2>
    <ul>
        {% for brand in all_brands %}
<!--            <li>{{ brand.brand_name }}</li>-->
            <li><a href = "{% url 'PhoneReview:modellist' brand.slug %}">{{ brand.brand_name }}</a></li>
        {% endfor %}
    </ul>
<img src="{% static "images/brandlist.jpg" %}" alt="Super Mario Odyssey" /> <!-- New line -->
{% endblock %}

{% extends 'PhoneReview/base.html' %}

{% load static %}

{% block title%}
Phone Model Page
{% endblock %}

{% block content %}
<!--Page content-->
<h1>This is Phone Model Page</h1>
<h2>Here is the phone model</h2>
    <ul>
        {% for phonemodel in all_model_name %}
            <li><a href = "{% url 'PhoneReview:details' phonemodel.slug %}">{{ phonemodel.model_name }}</a></li>
        {% endfor %}
    </ul>
<img src="{% static "images/brandlist.jpg" %}" alt="Super Mario Odyssey" /> <!-- New line -->
{% endblock %}

{% extends 'PhoneReview/base.html' %}
{% load static %}

<html>

<link rel="stylesheet" type="text/css" href="{% static "css/style.css" %}">


<html lang="en">

{% block title%}Details{% endblock %}

{% block content %}

<h1>This is the Details Page</h1>

<h2>Review:</h2>
<p>{{ review.review_article }}</p>

<h2>News Link:</h2>
<p>{{ review.link }}</p>
{% endblock %}
</html>

{%extends'PhoneReview/base.html%}
{%load static%}
{%block title%}
电话型号页
{%endblock%}
{%block content%}
这是手机型号页
这是电话型号

{所有\u model\u name%中的phonemodel的百分比}

{%endfor%}

{%endblock%}

以下是我在templates文件夹中的details.html代码：

{% extends 'PhoneReview/base.html' %}

{% load static %}

{% block title%}
Brand List
{% endblock %}

{% block content %}
<!--Page content-->
<h1>This is Brand List Page</h1>
<h2>Here is the list of the brands</h2>
    <ul>
        {% for brand in all_brands %}
<!--            <li>{{ brand.brand_name }}</li>-->
            <li><a href = "{% url 'PhoneReview:modellist' brand.slug %}">{{ brand.brand_name }}</a></li>
        {% endfor %}
    </ul>
<img src="{% static "images/brandlist.jpg" %}" alt="Super Mario Odyssey" /> <!-- New line -->
{% endblock %}

{% extends 'PhoneReview/base.html' %}

{% load static %}

{% block title%}
Phone Model Page
{% endblock %}

{% block content %}
<!--Page content-->
<h1>This is Phone Model Page</h1>
<h2>Here is the phone model</h2>
    <ul>
        {% for phonemodel in all_model_name %}
            <li><a href = "{% url 'PhoneReview:details' phonemodel.slug %}">{{ phonemodel.model_name }}</a></li>
        {% endfor %}
    </ul>
<img src="{% static "images/brandlist.jpg" %}" alt="Super Mario Odyssey" /> <!-- New line -->
{% endblock %}

{% extends 'PhoneReview/base.html' %}
{% load static %}

<html>

<link rel="stylesheet" type="text/css" href="{% static "css/style.css" %}">


<html lang="en">

{% block title%}Details{% endblock %}

{% block content %}

<h1>This is the Details Page</h1>

<h2>Review:</h2>
<p>{{ review.review_article }}</p>

<h2>News Link:</h2>
<p>{{ review.link }}</p>
{% endblock %}
</html>

{%extends'PhoneReview/base.html%}
{%load static%}
{%block title%}详细信息{%endblock%}
{%block content%}
这是详细信息页面
审查：
{{review.review{u article}}

新闻链接：
{{review.link}

{%endblock%}

我对details.html做了什么错误吗？当我在url.py中使用

而不是

时，它工作得非常好

更新1：当我试图通过Django admin添加对手机型号的评论时，出现以下错误：

“”需要为字段“id”设置一个值才能使用此多对多关系。

更新2：我已通过删除

models.py上
课堂回顾
中的这些行修复了上述问题：

def保存（self，*args，**kwargs）：
self.slug=slugify（self.phone\u型号）
super（）.save（*args，**kwargs）
我帮助您使用了
获取对象或404
方法，我猜您最初没有该字段，您可能后来添加了该字段，我猜模型没有该段塞。请确认该模型是否具有该段塞。如果没有该段塞或具有其他段塞，请重新保存该模型，以便可以保存段塞。
class ModelView
具有
get\u object\u或\u 404
。但是
class ReviewView
没有它。你是要我把它添加到
课堂复习视图中吗？
课堂复习有
slug
。我用以下代码保存了slug:
def save（self，*args，**kwargs）：self.slug=slagify（self.phone_model）super（）.save（*args，**kwargs）
。请查看我在
models.py
@FaisalManzer上的代码请查看我以前的评论。