找不到带有参数“（''，）”的“ note_detail”。尝试了1个模式：['notes \\ /（？P <slug> [-\\ w] +）/ $']

Question

/ notes /处的NoReverseMatch 找不到带有参数“（''，）”的“ note_detail”。尝试了1种模式：['notes \ /（？P [-\ w] +）/ $'] 请求方法：GET 要求网址： Django版本：2.0.3 异常类型：NoReverseMatch 异常值：
找不到带有参数“（''，）”的“ note_detail”。尝试了1种模式：['notes \ /（？P [-\ w] +）/ $'] 例外位置：_reverse_with_prefix，第632行中的C：\ Users \ auwwa \ Desktop \ notes \ lib \ site-packages \ django \ urls \ resolvers.py Python可执行文件：C：\ Users \ auwwa \ Desktop \ notes \ Scripts \ python.exe 的Python版本：3.6.4 Python路径：
['C：\ Users \ auwwa \ Desktop \ notes \ src \ notes'，  'C：\ Users \ auwwa \ Desktop \ notes \ Scripts \ python36.zip'，  'C：\ Users \ auwwa \ Desktop \ notes \ DLLs'，  'C：\ Users \ auwwa \ Desktop \ notes \ lib'，  'C：\ Users \ auwwa \ Desktop \ notes \ Scripts'，  'C：\ Users \ auwwa \ AppData \ Local \ Programs \ Python \ Python36 \ Lib'，  'C：\ Users \ auwwa \ AppData \ Local \ Programs \ Python \ Python36 \ DLLs'，  'C：\ Users \ auwwa \ Desktop \ notes'，  'C：\ Users \ auwwa \ Desktop \ notes \ lib \ site-packages'] 服务器时间：2018年10月24日，星期三21:18:57 +0000

我对'note_detail'有反向问题，但找不到参数'（''，）'。尝试了1种模式：['notes \ /（？P [-\ w] +）/ $']

这是viewes：

from django.shortcuts import render
from .models import Note
from django.contrib.auth.models import User
from .forms import NoteForm
# Create your views here.

def all_notes(request):
    all_notes = Note.objects.all()
    context = {
        'all_notes':all_notes,

    }
    return render(request, 'all_notes.html',context)



def detail(request, slug):
    note = Note.objects.get(slug=slug)
    context = {
        'note':note
    }
    return render(request, 'note_details.html', context)

def note_add(request):

    if request.method == 'POST':
        form = NoteForm(request.POST)
        if form.is_valid():
            new_form = form.save(commit=False)
            new_form.user = request.user
            new_form.save()
    else:
        form = NoteForm()
    context={ 
        'form':form
    }
    return render(request, 'add.html',context)

和网址nots_app：

from django.conf.urls import url
from . import views

app_name = "notes_app"
urlpatterns = [
    url(r'^$', views.all_notes, name='all_notes'),
    url(r'^(?P<slug>[-\w]+)/$', views.detail , name='note_detail'),
    url(r'^Add$', views.note_add, name='add_note'),
]

forms.py ::

from django import forms
from .models import Note

class NoteForm(forms.ModelForm):    
    class Meta:
        model = Note
        fields = ['title', 'content', 'tags']

all-notes.html ::

<h1>Welcome in my notes</h1>

<h3>All The Available Notes</h3>
<a href="{% url 'notes:add_note' %}">Add New Notes</a>

<br>
<hr>
{% for note in all_notes %}
<a href="{% url 'notes:note_detail' note.slug %}">{{note}}</a>
<br>
{% endfor %}

notes_detail.html ::

<h1>welcome</h1>

{{note}}<br>
{{note.content}}<br>
{{note.created}}<br>
{{note.tags}} <br>

models.py :::

from django.db import models
from django.contrib.auth.models import User
import datetime
from django.utils.text import slugify


# Create your models here.
class Note(models.Model):
    user = models.ForeignKey(User, on_delete=models.CASCADE)
    title = models.CharField(max_length=50)
    slug = models.SlugField(null=True,blank=True)
    content = models.TextField(blank=True)
    created = models.DateTimeField(blank=True, default=datetime.datetime.now)
    active = models.BooleanField(default=True)
    tags = models.CharField(blank=True, max_length=100)

    def save(self, *args, **kwargs ):
        if not self.slug:
            self.slug = slugify(self.title)
        super(Note, self).save(*args, **kwargs )

    def __str__(self):
        return self.title

Answer 1

此行中的note.slug没有返回值。上下文值all_notes中没有对象，或者没有子对象，则上下文对象名称不正确，等等。如果您知道现有子对象的值，只需对其进行硬核以查看其是否有效，例如