It doesn't seem to work. I wrote your example in views.py.
Or I might make mistakes. Could you see?
views. py
from .models import Book, Author, BookInstance, Genre
from django.views import generic
from django.shortcuts import render
from django.views.generic.base import TemplateView
# Create your views here.
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(TemplateView):
template_name = "catalog/book_list.html"
class BookDetailView(TemplateView):
template_name = "catalog/book_detail.html"
urls.py
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'),
]
ср, 6 окт. 2021 г. в 12:45, Adeyemi Deji <[email protected]>:
> for example.
>
> class AboutView(TemplateView):
> template_name = "about.html"
>
>
> On Wed, Oct 6, 2021 at 11:32 AM Никита Назаров <[email protected]>
> wrote:
>
>> Hello!
>> Thank you!
>> I'm sorry. How could I do this?
>>
>> среда, 6 октября 2021 г. в 11:20:19 UTC+3, [email protected]:
>>
>>> Hi, I observed that you didn't specify the template name attribute for
>>> the BookListView and BookDetailView, that should solve you problem.
>>>
>>> On Tuesday, October 5, 2021 at 10:37:19 PM UTC+2 [email protected]
>>> wrote:
>>>
>>>> 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
>>>>
>>> --
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