Develop Reference

Not redirecting from createView form to Home

I am learning fresh django development. Working on a blog project I am facing a issue that, while publishing a new blog, that doesn't redirects to home/blogs page. I tried to manually to go home It says,
OperationalError at /blog/
no such column: App_Blog_blog.author_id
I tried to debug several times, searched in documentation can't get away with this author_id. These are my codes:
Views.py
class CreateBlog(LoginRequiredMixin, CreateView):
model = Blog
template_name = 'App_Blog/create_blog.html'
fields = ('blog_title', 'blog_content', 'blog_image',)
def form_valid(self, form):
blog_obj = form.save(commit=False)
blog_obj.author = self.request.user
title = blog_obj.blog_title
blog_obj.slug = title.replace(" ", "-") + "-" + str(uuid.uuid4())
blog_obj.save()
return HttpResponseRedirect(reverse('index'))
class BlogList(ListView):
context_object_name = 'blogs'
model = Blog
template_name = 'App_Blog/blog_list.html'
Views.py of main project file
def index(request):
return HttpResponseRedirect(reverse('App_Blog:blog_list'))
urls.py
from django.urls import path
from App_Blog import views
app_name = 'App_Blog'
urlpatterns = [
path('', views.BlogList.as_view(), name='blog_list'),
path('write/', views.CreateBlog.as_view(), name='create_blog'),
]
models.py
from django.db import models
from django.contrib.auth.models import User
# Create your models here.
class Blog(models.Model):
author = models.ForeignKey(
User, on_delete=models.CASCADE, related_name='post_author')
blog_title = models.CharField(max_length=264, verbose_name="Put a Title")
slug = models.SlugField(max_length=264, unique=True)
blog_content = models.TextField(verbose_name="What is on your mind?")
blog_image = models.ImageField(
upload_to='blog_images', verbose_name="Image")
publish_date = models.DateTimeField(auto_now_add=True)
update_date = models.DateTimeField(auto_now=True)
def __str__(self):
return self.blog_title
create_blog.html
{% extends 'base.html' %}
{% load crispy_forms_tags %}
{% block title_block %}
Write a Blog
{% endblock title_block %}
{% block body_block %}
<h2>Start Writing:</h2>
<form method="POST">
{{ form | crispy }}
{% csrf_token %}
<br>
<button type="button" class="btn btn-success btn-sm">Publish</button>
</form>
{% endblock body_block %}
blog_list.html
{% extends 'base.html' %}
{% block title_block %} Home {% endblock %}
{% block body_block %}
{% for blog in blogs %}
<h3>{{blog.blog_title}}</h3>
<h6>{{blog.publish_date}}</h6>
{% endfor %}
{% endblock %}
Create Blog form:
Error showing on site:

Django: 404 Error Appears While Trying to Use Slug in URLs

I am a beginner in Django. Right now, I am learning the framework by building an app, called PhoneReview. It will store reviews related to the latest mobile phone. It will also display phone brands, along with the associated phone models and their reviews.
Right now, I am trying to use slug in URLs. I have successfully used slug in two of my templates, which are index.html and phonemodel.html. However, I am facing issues with the third template, which is details.html.
When I go to http://127.0.0.1:8000/index, I see this page:
When I click on Samsung, I see this page:
Up to this is fine.
But when I click on any phone model, like Galaxy S10, I get 404 error. It looks like this:
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.
When I click on Samsung, I am supposed to see the details.html page, which has the review of the phone, along with the news link. Instead, I am getting the 404 error.
Here are my codes of models.py located inside PhoneReview folder:
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
Here are my codes of urls.py located inside PhoneReview folder:
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'),
]
Here are my codes of views.py located inside PhoneReview folder:
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'
Here are my codes of apps.py located inside PhoneReview folder:
from django.apps import AppConfig
class PhonereviewConfig(AppConfig):
name = 'PhoneReview'
Here are my codes of index.html located inside templates folder:
{% 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>{{ brand.brand_name }}</li>
{% endfor %}
</ul>
<img src="{% static "images/brandlist.jpg" %}" alt="Super Mario Odyssey" /> <!-- New line -->
{% endblock %}
Here are my codes of phonemodel.html located inside templates folder:
{% 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>{{ phonemodel.model_name }}</li>
{% endfor %}
</ul>
<img src="{% static "images/brandlist.jpg" %}" alt="Super Mario Odyssey" /> <!-- New line -->
{% endblock %}
Here are my codes of details.html located inside templates folder:
{% 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>
<a href={{ review.link }}>{{ review.link }}</a>
{% endblock %}
</html>
Have I made any mistake in models.py or details.html?

I don't think there is an error in the code here. open Django shell by python3 manage.py shell then run the following query
I guess this will probably give NotFound error because there is no model with slug galaxy-s10
from your_app.models import Review
samsung_s10 = Review.objects.get(slug='galaxy-s10')
print(smasung_s10.slug)

Django: Getting an Error Saying "needs to have a value for field "id" before this many-to-many relationship can be used"

I am a beginner in Django. Right now, I am learning the framework by uilding an app, called PhoneReview. It will store reviews related to the latest mobile phone. It will also display phone brands, along with the associated phone models and their reviews.
When I go to http://127.0.0.1:8000/index, I see this page:
When I click on Samsung, I see this page:
Up to this is fine.
But when I click on any phone model, like Galaxy S10, I get 404 error. It looks like this:
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.
When I click on Samsung, I am supposed to see the details.html page, which has the review of the phone, along with the news link. Instead, I am getting the 404 error.
I thought that performing migration and adding a new review about any phone model, like Galaxy S10, through Django admin would fix the issue. But when I try to add a review for the Galaxy S10 through Django admin, I get this error:
"<Review: The Galaxy S10 is a fitting 10th anniversary phone for Samsung and its storied S series. It delivers on change with a novel-looking Infinity-O screen so large it displaces the front camera, and a triple-lens rear camera that takes ultra-wide photos. Its in-screen fingerprint sensor tech should serve you well, while its Wireless PowerShare could serve your friends well. That’s a lot of change – just know that it comes at a high price and the Galaxy S10e and S10 Plus flank it from both sides of the coin as better options.>" needs to have a value for field "id" before this many-to-many relationship can be used.
Here are my codes of models.py located inside PhoneReview folder:
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)
Here are my codes of urls.py located inside PhoneReview folder:
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'),
]
Here are my codes of views.py located inside PhoneReview folder:
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'
Here are my codes of apps.py located inside PhoneReview folder:
from django.apps import AppConfig
class PhonereviewConfig(AppConfig):
name = 'PhoneReview'
Here are my codes of index.html located inside templates folder:
{% 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>{{ brand.brand_name }}</li>
{% endfor %}
</ul>
<img src="{% static "images/brandlist.jpg" %}" alt="Super Mario Odyssey" /> <!-- New line -->
{% endblock %}
Here are my codes of phonemodel.html located inside templates folder:
{% 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>{{ phonemodel.model_name }}</li>
{% endfor %}
</ul>
<img src="{% static "images/brandlist.jpg" %}" alt="Super Mario Odyssey" /> <!-- New line -->
{% endblock %}
Here are my codes of details.html located inside templates folder:
{% 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>
<a href={{ review.link }}>{{ review.link }}</a>
{% endblock %}
</html>
Is there any problem in details.html?

Your review model save method is the issue. because slugify(self.phone_model) is executed before many to many field adding the value.
try
by commenting out save method for Review model

Django: Cannot Add Clickable Link in the Template

I am a beginner in Django. I am building a Django app, named PhoneReview. It will store reviews related to the latest mobile phone. It will also display phone brands, along with the associated phone models. I have already created models for:
Brand – details on brand, such as, name, origin, manufacturing since, etc
Model – details on model, such as, model name, launch date, platform, etc
Review – review article on the mobile phone and date published, etc
Many-to-many relationship between Review and Model.
I also have created views for the following:
a. An index page that display all Brands available for mobile phone in the database
b. A phone model page that display model when a brand is selected.
c. A detail page when a model is selected that contain reviews and newslink
Now, I am facing a problem. I cannot put any clickable link that will redirect the phone brands, like Apple and Samsung, of brandlist.html web page, to their respective phone model page (phonemodel.html). Here is the screenshot:
Here are the codes of models.py inside "PhoneReview" folder.
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)
def __str__(self):
return self.brand_name
def save(self, *args, **kwargs):
self.slug = slugify(self.title)
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)
def __str__(self):
return self.model_name
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)
def __str__(self):
return self.review_article
Here are the codes of urls.py inside "PhoneReview" folder.
from . import views
from django.urls import path
urlpatterns = [
path('index', views.BrandListView.as_view(), name='brandlist'),
path('phonemodel/<int:pk>/', views.ModelView.as_view(), name='modellist'),
path('details/<int:pk>/', views.ReviewView.as_view(), name='details'),
]
Here are the codes of views.py inside "PhoneReview" folder:
from django.views import generic
from .models import Brand, PhoneModel, Review
class BrandListView(generic.ListView):
template_name = 'PhoneReview/brandlist.html'
context_object_name = 'all_brands'
def get_queryset(self):
return Brand.objects.all()
class ModelView(generic.DetailView):
model = PhoneModel
template_name = 'PhoneReview/phonemodel.html'
class ReviewView(generic.DetailView):
model = Review
template_name = 'PhoneReview/details.html'
Here are the codes of apps.py inside "PhoneReview" folder:
from django.apps import AppConfig
class PhonereviewConfig(AppConfig):
name = 'PhoneReview'
Here are the codes of phonemodel.html. The page can be accessed by going through http://127.0.0.1:8000/phonemodel/1/ in the browser.
{% 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>
<li>{{ phonemodel.model_name }}</li>
</ul>
<img src="{% static "images/brandlist.jpg" %}" alt="Super Mario Odyssey" /> <!-- New line -->
{% endblock %}
Here are the codes of brandlist.html. The web page can be accessed by going to http://127.0.0.1:8000/index in the browser.
{% 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>
{% endfor %}
</ul>
<img src="{% static "images/brandlist.jpg" %}" alt="Super Mario Odyssey" /> <!-- New line -->
{% endblock %}
I tried modifying <li>{{ brand.brand_name }}</li>to <li>{{ phonemodel.model_name }}</li> . But the code doesn't work.
What should I do?
Update 1: I can't view the brandlist.html page when I add <li>{{ phonemodel.model_name }}</li>. I get an error on http://127.0.0.1:8000/index. It says 'phonemodel' is not a registered namespace
Update 2: I have managed to fix the issue. I changed the code to <li>{{ brand.brand_name }}</li>. Thanks to #LinhNguyen for giving me the idea.

You forgot to close your a tag and since you already declared your url name in urls.py so no need to add the app name before the url
{{ brand.brand_name }}

Block in django doesnt show the another views

I'am begginer in Django so please try to understand me.
I have a problem with the blocks in my django project. I created the base.html like this
{% include 'firmy/header.html' %}
<html>
<body>
<h4>Ostatnio dodane</h4>
{% block firmy %}
{% endblock %}
<h4>Kategorie</h4>
{% block kategorie %}
{% endblock %}
</body>
{% include 'firmy/footer.html' %}
</html>
and {%block firmy%} showing me every records what I want from another file but the {%block kategorie%} showing nothing.
in views.py I have the code:
from django.shortcuts import render
from .models import Witryna, Kategorie
from django.utils import timezone
def widok_strony(request):
firmy = Witryna.objects.filter(data_publikacji__lte=timezone.now()).order_by('data_publikacji')
return render(request, 'firmy/widok_strony.html', {'firmy': firmy})
def widok_kategorii(request):
kategorie = Kategorie.objects.all().order_by('glowna')
return render(request, 'firmy/widok_kategorii.html', {'kategorie': kategorie})
and in urls.py i have the code :
from django.conf.urls import url
from . import views
urlpatterns = [
url(r'^$', views.widok_strony, name='widok_strony'),
url(r'^$', views.widok_kategorii, name='widok_kategorii'),
]
and on the end models.py
from django.db import models
from django.utils import timezone
class Kategorie(models.Model):
glowna = models.CharField(max_length=150, verbose_name='Kategoria')
class Meta:
verbose_name='Kategoria'
verbose_name_plural='Kategorie'
def __str__(self):
return self.glowna
class Witryna(models.Model):
nazwa = models.CharField(default="", max_length=150, verbose_name = 'Nazwa strony')
adres_www = models.CharField(max_length=70, verbose_name='Adres www')
slug = models.SlugField(max_length=250, verbose_name='Przyjazny adres url')
email = models.CharField(max_length=100, verbose_name='Adres e-mail')
text = models.TextField(max_length=3000, verbose_name='Opis strony')
kategoria = models.ForeignKey(Kategorie, verbose_name='Kategoria')
data_publikacji = models.DateTimeField(blank=True, null=True, verbose_name='Data publikacji')
class Meta:
verbose_name='Strona www'
verbose_name_plural = 'Strony www'
def publikacja(self):
self.data_publikacji=timezone.now()
self.save()
def __str__(self):
return self.nazwa
and widok_kategorii.html
{% extends 'firmy/base.html' %}
{% block kategorie %}
{% for kategoria in kategorie %}
<p>{{ kategoria.glowna }}</p>
{% endfor %}
{% endblock kategorie %}
Really I don't know where is the problem but when I open the browser on localhost:8000 the I can't see the details from class Kategorie.

You have a huge misconception about how views and URLs work.
A URL can only be served by one view. That view will be entirely responsible for creating the response, which it usually does by rendering a single template. You need to pass all the information for your template from that view.