Hello!
I’m beginner in Django. I do Django Tutorial from Mozilla.
I get TemplateDoesNotExist at /catalog/books/ . Could you help me?. I don’t
understand how to resolve it.
*/catalog/urls*
from django.urls import path
from . import views
urlpatterns = [
path('', views.index, name='index'),
path('books/', views.BookListView.as_view(), name='books'),
path('book/<int:pk>', views.BookDetailView.as_view(),
name='book-detail'),
]
*catalog/models*
# Used to generate URLs by reversing the URL patterns
from django.urls import reverse
from django.db import models
from django.urls import reverse
import uuid
# Create your models here
class Genre(models.Model):
"""Model representing a book genre (e.g. Science Fiction, Non
Fiction)."""
name = models.CharField(
max_length=200,
help_text="Enter a book genre (e.g. Science Fiction, French Poetry
etc.)"
)
def __str__(self):
"""String for representing the Model object (in Admin site etc.)"""
return self.name
class Book(models.Model):
"""Model representing a book (but not a specific copy of a book)."""
title = models.CharField(max_length=200)
author = models.ForeignKey('Author', on_delete=models.SET_NULL,
null=True)
# Foreign Key used because book can only have one author, but authors
can have multiple books
# Author as a string rather than object because it hasn't been declared
yet in file.
summary = models.TextField(
max_length=1000, help_text="Enter a brief description of the book")
isbn = models.CharField('ISBN', max_length=13,
unique=True,
help_text='13 Character <a
href="https://www.isbn-international.org/content/what-isbn'
'">ISBN number</a>')
genre = models.ManyToManyField(
Genre, help_text="Select a genre for this book")
# ManyToManyField used because a genre can contain many books and a
Book can cover many genres.
# Genre class has already been defined so we can specify the object
above.
language = models.ForeignKey(
'Language', on_delete=models.SET_NULL, null=True)
class Meta:
ordering = ['title', 'author']
def display_genre(self):
"""Creates a string for the Genre. This is required to display
genre in Admin."""
return ', '.join([genre.name for genre in self.genre.all()[:3]])
display_genre.short_description = 'Genre'
def get_absolute_url(self):
"""Returns the url to access a particular book instance."""
return reverse('book-detail', args=[str(self.id)])
def __str__(self):
"""String for representing the Model object."""
return self.title
class Language(models.Model):
name = models.CharField(
max_length=50, help_text="Enter the book's natural language (e.g.
English, French, Japanese etc.)")
def __str__(self):
return self.name
class BookInstance(models.Model):
id = models.UUIDField(primary_key=True, default=uuid.uuid4,
help_text="Unique ID for this particular book
across whole library")
book = models.ForeignKey('Book', on_delete=models.SET_NULL, null=True)
imprint = models.CharField(max_length=200)
due_back = models.DateField(null=True, blank=True)
LOAN_STATUS = (
('m', 'Maintenance'),
('o', 'On loan'),
('a', 'Available'),
('r', 'Reserved'),
)
status = models.CharField(max_length=1, choices=LOAN_STATUS,
blank=True, default='m', help_text='Book
availability')
class Meta:
ordering = ["due_back"]
def __str__(self):
"""
String for representing the Model object
"""
return '%s (%s)' % (self.id, self.book.title)
class Author(models.Model):
"""
Model representing an author.
"""
first_name = models.CharField(max_length=100)
last_name = models.CharField(max_length=100)
date_of_birth = models.DateField(null=True, blank=True)
date_of_death = models.DateField('Died', null=True, blank=True)
def get_absolute_url(self):
"""
Returns the url to access a particular author instance.
"""
return reverse('author-detail', args=[str(self.id)])
def __str__(self):
"""
String for representing the Model object.
"""
return '%s, %s' % (self.last_name, self.first_name)
*catalog/views*
from django.views import generic
from django.shortcuts import render
# Create your views here.
from .models import Book, Author, BookInstance, Genre
def index(request):
"""View function for home page of site."""
# Generate counts of some of the main objects
num_books = Book.objects.all().count()
num_instances = BookInstance.objects.all().count()
# Available books (status = 'a')
num_instances_available = BookInstance.objects.filter(
status__exact='a').count()
# The 'all()' is implied by default.
num_authors = Author.objects.count()
context = {
'num_books': num_books,
'num_instances': num_instances,
'num_instances_available': num_instances_available,
'num_authors': num_authors,
}
# Render the HTML template index.html with the data in the context
variable
return render(request, 'catalog/index.html', context=context)
class BookListView(generic.ListView):
"""Generic class-based view for a list of books."""
model = Book
paginate_by = 10
class BookDetailView(generic.DetailView):
"""Generic class-based detail view for a book."""
model = Book
*locallibrary/settings.py*
"""
Django settings for locallibrary project.
Generated by 'django-admin startproject' using Django 3.2.7.
For more information on this file, see
https://docs.djangoproject.com/en/3.2/topics/settings/
For the full list of settings and their values, see
https://docs.djangoproject.com/en/3.2/ref/settings/
"""
import os
from pathlib import Path
# Build paths inside the project like this: BASE_DIR / 'subdir'.
BASE_DIR = Path(__file__).resolve().parent.parent
# Quick-start development settings - unsuitable for production
# See https://docs.djangoproject.com/en/3.2/howto/deployment/checklist/
# SECURITY WARNING: keep the secret key used in production secret!
SECRET_KEY =
'django-insecure-k6nhe44hm-a90^cs6**sre$8ajn7u!e735ou4c(1iqk-ga&g!9'
# SECURITY WARNING: don't run with debug turned on in production!
DEBUG = os.environ.get('DJANGO_DEBUG', '') != 'False'
ALLOWED_HOSTS = []
# Application definition
INSTALLED_APPS = [
'django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'catalog.apps.CatalogConfig',
]
MIDDLEWARE = [
'django.middleware.security.SecurityMiddleware',
'django.contrib.sessions.middleware.SessionMiddleware',
'django.middleware.common.CommonMiddleware',
'django.middleware.csrf.CsrfViewMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
'django.contrib.messages.middleware.MessageMiddleware',
'django.middleware.clickjacking.XFrameOptionsMiddleware',
]
ROOT_URLCONF = 'locallibrary.urls'
TEMPLATES = [
{
'BACKEND': 'django.template.backends.django.DjangoTemplates',
'DIRS': [os.path.join(BASE_DIR, 'templates')],
'APP_DIRS': True,
'OPTIONS': {
'context_processors': [
'django.template.context_processors.debug',
'django.template.context_processors.request',
'django.contrib.auth.context_processors.auth',
'django.contrib.messages.context_processors.messages',
],
},
},
]
WSGI_APPLICATION = 'locallibrary.wsgi.application'
# Database
# https://docs.djangoproject.com/en/3.2/ref/settings/#databases
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.sqlite3',
'NAME': BASE_DIR / 'db.sqlite3',
}
}
# Password validation
#
https://docs.djangoproject.com/en/3.2/ref/settings/#auth-password-validators
AUTH_PASSWORD_VALIDATORS = [
{
'NAME':
'django.contrib.auth.password_validation.UserAttributeSimilarityValidator',
},
{
'NAME':
'django.contrib.auth.password_validation.MinimumLengthValidator',
},
{
'NAME':
'django.contrib.auth.password_validation.CommonPasswordValidator',
},
{
'NAME':
'django.contrib.auth.password_validation.NumericPasswordValidator',
},
]
# Internationalization
# https://docs.djangoproject.com/en/3.2/topics/i18n/
LANGUAGE_CODE = 'en-us'
TIME_ZONE = 'Europe/London'
USE_I18N = True
USE_L10N = True
USE_TZ = True
# Static files (CSS, JavaScript, Images)
# https://docs.djangoproject.com/en/3.2/howto/static-files/
STATIC_URL = '/static/'
# Default primary key field type
# https://docs.djangoproject.com/en/3.2/ref/settings/#default-auto-field
DEFAULT_AUTO_FIELD = 'django.db.models.BigAutoField'
*Path templates*
locallibrary
-----catalog
------ templates
------ base_generis.html
-------book_detail.html
----------catalog
----------book_list.html
----------index.html
*book_list.html*
{% extends "base_generic.html" %}
{% block content %}
<h1>Book List</h1>
{% if book_list %}
<ul>
{% for book in book_list %}
<li>
<a href="{{ book.get_absolute_url }}">{{ book.title }}</a>
({{book.author}})
</li>
{% endfor %}
</ul>
{% else %}
<p>There are no books in the library.</p>
{% endif %}
{% endblock %}
*index.html*
{% extends "base_generic.html" %}
{% block title %}
<title>Стартовая страница</title>
{% endblock %}
{% block content %}
<h1>Local Library Home</h1>
<p>Welcome to <em>LocalLibrary</em>, a very basic Django website developed
as a tutorial example on the Mozilla
Developer Network.</p>
<h2>Dynamic content</h2>
<p>The library has the following record counts:</p>
<ul>
<li><strong>Books:</strong> {{ num_books }}</li>
<li><strong>Copies:</strong> {{ num_instances }}</li>
<li><strong>Copies available:</strong> {{ num_instances_available }}</li>
<li><strong>Authors:</strong> {{ num_authors }}</li>
</ul>
{% endblock %}
*traceback message*
Environment:
Request Method: GET
Request URL: http://127.0.0.1:8000/catalog/books/
Django Version: 3.2.7
Python Version: 3.9.7
Installed Applications:
[‘django.contrib.admin’,
‘django.contrib.auth’,
‘django.contrib.contenttypes’,
‘django.contrib.sessions’,
‘django.contrib.messages’,
‘django.contrib.staticfiles’,
‘catalog.apps.CatalogConfig’]
Installed Middleware:
[‘django.middleware.security.SecurityMiddleware’,
‘django.contrib.sessions.middleware.SessionMiddleware’,
‘django.middleware.common.CommonMiddleware’,
‘django.middleware.csrf.CsrfViewMiddleware’,
‘django.contrib.auth.middleware.AuthenticationMiddleware’,
‘django.contrib.messages.middleware.MessageMiddleware’,
‘django.middleware.clickjacking.XFrameOptionsMiddleware’]
Template loader postmortem
Django tried loading these templates, in this order:
Using engine django:
* django.template.loaders.filesystem.Loader:
/Users/nikita/Documents/Github/devsearch/hello-world/locallibrary/templates/catalog/book_list.html
(Source does not exist)
* django.template.loaders.app_directories.Loader:
/Users/nikita/Documents/Github/devsearch/hello-world/myproject_env/lib/python3.9/site-packages/django/contrib/admin/templates/catalog/book_list.html
(Source does not exist)
* django.template.loaders.app_directories.Loader:
/Users/nikita/Documents/Github/devsearch/hello-world/myproject_env/lib/python3.9/site-packages/django/contrib/auth/templates/catalog/book_list.html
(Source does not exist)
* django.template.loaders.app_directories.Loader:
/Users/nikita/Documents/Github/devsearch/hello-world/locallibrary/catalog/templates/catalog/book_list.html
(Source does not exist)
Traceback (most recent call last):
File
“/Users/nikita/Documents/Github/devsearch/hello-world/myproject_env/lib/python3.9/site-packages/django/core/handlers/exception.py”,
line 47, in inner
response = get_response(request)
File
“/Users/nikita/Documents/Github/devsearch/hello-world/myproject_env/lib/python3.9/site-packages/django/core/handlers/base.py”,
line 204, in _get_response
response = response.render()
File
“/Users/nikita/Documents/Github/devsearch/hello-world/myproject_env/lib/python3.9/site-packages/django/template/response.py”,
line 105, in render
self.content = self.rendered_content
File
“/Users/nikita/Documents/Github/devsearch/hello-world/myproject_env/lib/python3.9/site-packages/django/template/response.py”,
line 81, in rendered_content
template = self.resolve_template(self.template_name)
File
“/Users/nikita/Documents/Github/devsearch/hello-world/myproject_env/lib/python3.9/site-packages/django/template/response.py”,
line 63, in resolve_template
return select_template(template, using=self.using)
File
“/Users/nikita/Documents/Github/devsearch/hello-world/myproject_env/lib/python3.9/site-packages/django/template/loader.py”,
line 47, in select_template
raise TemplateDoesNotExist(’, '.join(template_name_list), chain=chain)
Exception Type: TemplateDoesNotExist at /catalog/books/
Exception Value: catalog/book_list.html
--
You received this message because you are subscribed to the Google Groups
"Django users" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to django-users+unsubscr...@googlegroups.com.
To view this discussion on the web visit
https://groups.google.com/d/msgid/django-users/a9d26893-9cd6-4021-9e3e-1c10012bd0a9n%40googlegroups.com.
