Django博客编辑后重定向至文章页及NoReverseMatch问题解决

Ah, that NoReverseMatch error is a classic gotcha when working with Django's reverse function! Let's break down what's going wrong and fix it step by step.

The Core Issue #

Your current code is passing the view_post function directly to reverse(), which isn't how the function works by default. reverse() expects either the name of your URL pattern (from urls.py) or a model's get_absolute_url() method—it doesn't accept view functions as the primary argument in most cases.

Step 1: Ensure Your URL Pattern Has a Name #

First, check your urls.py and make sure you've assigned a name to your view_post route. This is how Django maps names to actual URLs:

# urls.py
from django.urls import path
from . import views

urlpatterns = [
    # ... other routes ...
    # Add the 'name' parameter to your view_post URL
    path('post/<int:post_id>/', views.view_post, name='view_post'),
    path('post/edit_post/<int:post_id>/', views.edit_post, name='edit_post'),
]

Step 2: Fix the Redirect in edit_post #

Now update your edit_post view to use the URL name instead of the view function. Here's the corrected code:

# views.py
from django.http import HttpResponseRedirect
from django.urls import reverse
from .models import Post

def edit_post(request, post_id):
    post = Post.objects.get(id=post_id)
    
    if request.method == 'POST':
        # ... your form handling and save logic here ...
        post.save()
        
        # Use the URL name 'view_post' and pass the post_id as an argument
        return HttpResponseRedirect(reverse('view_post', args=[post_id]))
    
    # ... your GET request handling (render edit form) ...

Bonus: Use get_absolute_url (Django Best Practice) #

For a cleaner, more maintainable approach, add a get_absolute_url method to your Post model. This lets you reference the post's detail page directly from the model instance:

# models.py
from django.db import models
from django.urls import reverse

class Post(models.Model):
    title = models.CharField(max_length=200)
    content = models.TextField()
    # ... other fields ...

    def get_absolute_url(self):
        # Returns the URL for this post's detail page
        return reverse('view_post', args=[self.id])

Then in your edit_post view, you can simplify the redirect to:

return HttpResponseRedirect(post.get_absolute_url())

Quick Checks to Rule Out Other Issues #

• Double-check that post_id is a valid integer corresponding to an existing Post object.
• Ensure your URL pattern for view_post uses the same parameter name (post_id) as the one you're passing to reverse() (mismatched names will also cause NoReverseMatch).

内容的提问来源于stack exchange，提问作者pyknight202