Blog app Error: NoReverseMatch at /post/14/

[Robert CR]

I am making a blog app for my django website. Right now i'm making a comment feature, but when i try to view a post and the posts comments i get an error.

The Error

[Robert CR]

I think it has something to do with my urls.py and views.py

urls.py

from django.urls import path
from .views import (
    PostListView,
    PostDetailView,
    PostCreateView,
    PostUpdateView,
    PostDeleteView,
    UserPostListView,
    UserProfileListView,
    UserProfilePostListView
)
from . import views


urlpatterns = [
    path('', PostListView.as_view(), name='blog-home'),
    path('user/<str:username>/', UserProfileListView.as_view(), name='user-profile' ),
    path('user/<str:username>/posts/', UserPostListView.as_view(), name='user-posts'),
    path('user/<str:username>/posts/view/', UserProfilePostListView.as_view(), name='user-posts-view'),
    path('post/<int:pk>/', PostDetailView.as_view(), name='post-detail'),
    path('post/<int:pk>/comment/', views.add_comment, name='add-comment'),
    path('post/new', PostCreateView.as_view(), name='post-create'),
    path('post/<int:pk>/edit/', PostUpdateView.as_view(), name='post-update'),
    path('post/<int:pk>/delete/', PostDeleteView.as_view(), name='post-delete'),
    path('about/', views.about, name='blog-about')
]

views.py

from django.shortcuts import render, get_object_or_404

from django.contrib.auth.mixins import LoginRequiredMixin, UserPassesTestMixin

from django.contrib.auth.models import User

from django.views.generic import ListView, DetailView, CreateView, UpdateView, DeleteView

from .models import Post

def home(request):

    context = {

        'posts': Post.objects.all()

    }

    return render(request, 'blog/home.html', context)

def upsite(request):

    context = {

        'uposts': UPost.objects.all()

    }

class PostListView(ListView):

    model = Post

    template_name = 'blog/home.html'

    context_object_name = 'posts'

    ordering =['-date_posted']

    paginate_by = 5

class UserPostListView(ListView):

    model = Post

    template_name = 'blog/user_posts.html'

    context_object_name = 'posts'

    paginate_by = 5

    def get_queryset(self):

        user = get_object_or_404(User, username=self.kwargs.get('username'))

        return Post.objects.filter(author=user).order_by('-date_posted')

class UserProfileListView(ListView):

    model = Post

    template_name = 'blog/user_profile.html'

    context_object_name = 'posts'

    paginate_by = 5

    def get_queryset(self):

        user = get_object_or_404(User, username=self.kwargs.get('username'))

        return Post.objects.filter(author=user).order_by('-date_posted')

class UserProfilePostListView(ListView):

    model = Post

    template_name = 'blog/user_profile_posts.html'

    context_object_name = 'posts'

    paginate_by = 5

    def get_queryset(self):

        user = get_object_or_404(User, username=self.kwargs.get('username'))

        return Post.objects.filter(author=user).order_by('-date_posted')

class PostDetailView(DetailView):

    model = Post

class PostCreateView(LoginRequiredMixin, CreateView):

    model = Post

    fields = ['title', 'content']

    def form_valid(self, form):

        form.instance.author = self.request.user

        return super().form_valid(form)

class PostUpdateView(LoginRequiredMixin, UserPassesTestMixin, UpdateView):

    model = Post

    fields = ['title', 'content']

    def form_valid(self, form):

        form.instance.author = self.request.user

        return super().form_valid(form)

    def test_func(self):

        post = self.get_object()

        if self.request.user == post.author:

            return True

        else:

            return False

class PostDeleteView(LoginRequiredMixin, UserPassesTestMixin, DeleteView):

    model = Post

    success_url = '/'

    def test_func(self):

        post = self.get_object()

        if self.request.user == post.author:

            return True

        else:

            return False

def about(request):

    return render(request, 'blog/about.html', {'title': 'About'})

def add_comment(request, slug):

    post = get_object_or_404(Post, slug=slug)

    if request.method == 'POST':

        form = CommentForm(request.POST)

        if form.is_valid():

            comment = form.save(commit=False)

            comment.post = post

            comment.save()

            return redirect('blog:post_detail', slug=post.slug)

    else:

        form = CommentForm()

    template = 'blog/add-comment.html'

    context = {

        'form': form

    }

    return render(request, template, context)

[Manjunath]

Please provide snapshot of your template file as well as project's urls.py file.

[Robert CR]

here is the template file.

add_comment.html

{% extends "blog/base.html" %}

{% load crispy_forms_tags %}

{% block content %}

  <div class="content-section">

    <form method="POST">

      {% csrf_token %}

        <fieldset class="form-group">

          <legend class="border-bottom mb-4">Comment</legend>

          {{ form|crispy }}

        </fieldset>

        <div class="form-group">

          <button class="btn btn-outline-warning" type="submit">Post Comment!</button>

        </div>

    </form>

  </div>

{% endblock content %}

[Manjunath]

Try adding for action to your add_comment url  then submit the form.

I guess currently form is getting submitted in the same page.

[Glen D souza]

Hi,

Try after name-spacing url patterns i.e 

app_name = 'blog'

urlpatterns = [
    path('', PostListView.as_view(), name='blog-home'),
    path('user/<str:username>/', UserProfileListView.as_view(), name='user-profile' ),
    path('user/<str:username>/posts/', UserPostListView.as_view(), name='user-posts'),
    path('user/<str:username>/posts/view/', UserProfilePostListView.as_view(), name='user-posts-view'),
    path('post/<int:pk>/', PostDetailView.as_view(), name='post-detail'),
    path('post/<int:pk>/comment/', views.add_comment, name='add-comment'),
    path('post/new', PostCreateView.as_view(), name='post-create'),
    path('post/<int:pk>/edit/', PostUpdateView.as_view(), name='post-update'),
    path('post/<int:pk>/delete/', PostDeleteView.as_view(), name='post-delete'),
    path('about/', views.about, name='blog-about')
]

https://docs.djangoproject.com/en/2.1/topics/http/urls/#naming-url-patterns

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[daniel main]

Hello, 

Have you tried adding an app_name = 'your_app_name' in the URLs.py file?

Thanks

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[Robert CR]

i fixed the error, thanks. But there is already a new one when i try to add a comment. D:

[Glen D souza]

try renaming path('post/<int:pk>/comment/', views.add_comment, name='add-comment'),

to path('post/<int:slug>/comment/', views.add_comment, name='add-comment'),

On Fri, 12 Oct 2018 at 12:36, Robert CR <robert...@gmail.com> wrote:

i fixed the error, thanks. But there is already a new one when i try to add a comment. D:

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[Robert CR]

If i do that i get another error:

[Glen D souza]

def add_comment(request, slug):

    post = get_object_or_404(Post, slug=slug)

    if request.method == 'POST':

        form = CommentForm(request.POST)

        if form.is_valid():

            comment = form.save(commit=False)

            comment.post = post

            comment.save()

            return redirect('blog:post_detail', slug=post.slug)

    else:

        form = CommentForm()

    template = 'blog/add-comment.html'

    context = {

        'form': form

    }

    return render(request, template, context)

Check this view, it has an argument called slug and from your url you are passing parameter to that slug argument i.e path('post/<int:slug>/comment/', views.add_comment, name='add-comment')

In this case slug field will contain the id of the post i believe,

If you check this post = get_object_or_404(Post, slug=slug), slug field contains the id but your post model does not an attribute called slug so what you should really do is

post = get_object_or_404(Post, id=slug) or you can rename the url as path('post/<int:id>/comment/', views.add_comment, name='add-comment') and your view as 

def add_comment(request, id):

    post = get_object_or_404(Post, id=id)

    if request.method == 'POST':

        form = CommentForm(request.POST)

        if form.is_valid():

            comment = form.save(commit=False)

            comment.post = post

            comment.save()

            return redirect('blog:post_detail', slug=post.slug)

    else:

        form = CommentForm()

    template = 'blog/add-comment.html'

    context = {

        'form': form

    }

    return render(request, template, context)

On Fri, 12 Oct 2018 at 12:56, Robert CR <robert...@gmail.com> wrote:

If i do that i get another error:

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[daniel main]

Use id instead of pk

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[Robert CR]

then a new error pops up:

[Robert CR]

is it because i have forgotten to import CommentForm?