ValueError at /<user-slug>/<blog-slug> 字段 'id' 需要一个数字，但在 django 中得到了 '<user-slug>'

Question

现在我正在开发一个博客应用程序，该应用程序是在不使用 django 管理站点的情况下制作的，并且我已经添加了博客文章功能。我已经使用两个外键到单个 User 模型，该模型是使用自定义用户模型定制的.

现在，问题是我不能在一个 url 中连续分配两个 slug。我附上了视图和 url 的代码以便更好地理解。

我曾尝试删除所有迁移并重新迁移所有东西，但它对我不起作用。有没有解决这个问题的方法。

这是我的代码，

views.py

from django.shortcuts import render,redirect
from .models import languages,BlogData
from django.conf import settings
from login.models import BaseUserManager,AbstractUser,User
from login.views import register_user
from django.shortcuts import get_object_or_404
from django.utils.text import slugify

# Create your views here.
def index(request):
    blogs = BlogData.objects.order_by('-publish_date')
    return render(request,"index.html",{'languages':languages, 'blogs':blogs})

def login(request):
    return render(request,"login.html")

def about(request,user_slug):
    return render(request,"about.html")

def sample(request):
    return  render(request, "sample.html")

def register(request):
    return render(request,"register.html")

"""-------------The main function below from which I am getting error---------"""

def blog_details(request,user_slug,blog_slug):
    blog = get_object_or_404(BlogData,user_slug = user_slug,blog_slug = blog_slug)
    return render(request,"sample.html",{'blog':blog})

def post(request):
    return render(request,"contact.html")

def submit_post(request):
    if request.method == 'POST':
        blg_tt = request.POST['blog_title']
        blg_stt = request.POST['blog_subtitle']
        blg_cnt = request.POST['blog_content']
        blg_img = request.POST['blog_img']
        blg_slg = slugify(blg_tt)

        print(User.user_slug)

        data = BlogData.objects.create(blogger_name=request.user,blog_title=blg_tt,blog_subtitle=blg_stt,blog_body=blg_cnt,blog_baseimg=blg_img,blog_slug=blg_slg,user_slug=request.user)
        data.save()

        return redirect("index")

urls.py

from django.urls import path,include
from . import views

urlpatterns = [
    path("",views.index, name = "index"),
    path("login/",views.login, name = "login"),
    path("about",views.about,name = "about"),
    path("sample",views.sample, name = "sample"),
    path("register",views.register,name = "register"),
    path("contact",views.post,name = "post"),
    path("post_blog",views.submit_post,name = "post_blog"),
    path("<slug:user_slug>/",views.about,name = "about"),

    # Here's the path below from I want to call the view function 

    path("<slug:user_slug>/<slug:blog_slug>/",views.blog_details,name = "blog_details"),
]

models.py

from django.db import models
from django.conf import settings
from django.urls import reverse
from login.models import User
from django.utils.text import slugify

# Create your models here.
languages = ['eng','fra','spa','hin']

class BlogData(models.Model):
    blogger_name = models.ForeignKey(User,on_delete=models.CASCADE,related_name='blogger_name')
    publish_date = models.DateTimeField(auto_now=True)
    blog_title = models.TextField()
    blog_subtitle = models.TextField()
    blog_body = models.TextField()
    blog_baseimg = models.ImageField(upload_to='pics',null=True)
    blog_slug = models.SlugField(max_length=200,db_index=True,unique=False)
    user_slug = models.ForeignKey(User,on_delete=models.CASCADE,related_name='users_slug')

    def get_absolute_url(self):
       
        #Here I had given the views function args

        return reverse('blog_details',args=[self.user_slug.user_slug,self.blog_slug])

    def __str__(self):
        return self.blog_title

models.py（自定义用户模型）

from django.db import models
from django.contrib.auth.models import AbstractUser,BaseUserManager

# Create your models here.
class UserManager(BaseUserManager):
    use_in_migrations = True
    def _create_user(self,email,password,**kwargs):
        email = self.normalize_email(email=email)
        user = self.model(email=email,**kwargs)
        user.set_password(password)
        user.save(using = self._db)
        return user

    def create_user(self,email,password = None,**kwargs):
        kwargs.setdefault('is_staff',False)
        kwargs.setdefault('is_superuser',False)
        return self._create_user(email,password,**kwargs)

class User(AbstractUser):

    username = None
    email = models.EmailField(unique = True)
    user_slug = models.SlugField(max_length=200,unique=False)

    USERNAME_FIELD = 'email'
    REQUIRED_FIELDS = []

    objects = UserManager()

Answer 1

试试这个：

def blog_details(request,user_slug,blog_slug):
    blog = get_object_or_404(BlogData, user_slug__user_slug=user_slug, blog_slug=blog_slug)
    return render(request,"sample.html",{'blog':blog})