Django 3 by Example (3rd Edition) published by Packt
Home Page: https://djangobyexample.com/
License: MIT License
This is the code repository for Django 3 by Example, written by Antonio Melé and published by Packt. It contains all the supporting project files necessary to work through the book from start to finish.
Check out the source code for the latest edition of this book: Django 4 by Example
If you have already purchased a print or Kindle version of this book, you can get a DRM-free PDF version at no cost.
Simply click on the link to claim your free PDF.
Image from bookmarklet is not downloaded and the image attribute of Image model remains empty giving value error on image detail page. I have already checked all the code but everything seems to be correct yet error is still there.
Any help will be appreciated !
127.0.0.1:8000 shows :
Page not found (404)
| Request Method: | GET |
|---|---|
| http://127.0.0.1:8000/ | |
| courses.views.CourseListView |
Any suggestions?
Hi everybody,
I'm not sure whether this is normal or whether I messed something up: I select an image from the bookmarklet, the "bookmark an image" page opens, I click on "bookmark it", and it takes roughly a minute until the image_detail view opens. There are no error messages, and I see only return codes 200 and 302 in the server console.
Any idea what could be going wrong, or how to find out what the error is?
Thanks,
jrdjango
Hi
thanks for this amazing book.
while following along, I found that django-parler==2.0.1 has some problem
both of these are incorrect reference. those should be
but django-parler==2.2 has fixed it.
So I think, using this version will be proper
Thanks
I want to Fix that ... Please let me know how to do that . Because a User can Comment same many times if he just reloading the same which on which he commented.
Thank You
Tried using the bookmarklet in several sites but it always throws the same issue and does nothing. The console displays net::ERR_CERT_AUTHORITY_INVALID every time I try to use it. Any solution for this?
When i run
sudo bash
su postgres
createuser -dP blog
createdb -E utf8 -U blog blogget error createdb: could not connect to database template1: FATAL: Peer authentication failed for user "blog"
the following command fix the problem
createdb -E utf8 -U blog -h 127.0.0.1 blogand the database setting become
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.postgresql',
'NAME': 'blog',
'USER':'blog',
'PASSWORD':'123456',
'HOST':'127.0.0.1'
}
}i run:
python manage.py migrate
on Windows 10, postgresql12 and get this error
Traceback (most recent call last):
File "C:\Users\Splendor\Envs\World\lib\site-packages\django\db\backends\base\base.py", line 220, in ensure_connection
self.connect()
File "C:\Users\Splendor\Envs\World\lib\site-packages\django\utils\asyncio.py", line 26, in inner
return func(*args, **kwargs)
File "C:\Users\Splendor\Envs\World\lib\site-packages\django\db\backends\base\base.py", line 197, in connect
self.connection = self.get_new_connection(conn_params)
File "C:\Users\Splendor\Envs\World\lib\site-packages\django\utils\asyncio.py", line 26, in inner
return func(*args, **kwargs)
File "C:\Users\Splendor\Envs\World\lib\site-packages\django\db\backends\postgresql\base.py", line 185, in get_new_connection
connection = Database.connect(**conn_params)
File "C:\Users\Splendor\Envs\World\lib\site-packages\psycopg2_init_.py", line 127, in connect
conn = _connect(dsn, connection_factory=connection_factory, **kwasync)
psycopg2.OperationalError
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "manage.py", line 21, in
main()
File "manage.py", line 17, in main
execute_from_command_line(sys.argv)
File "C:\Users\Splendor\Envs\World\lib\site-packages\django\core\management_init_.py", line 401, in execute_from_command_line
utility.execute()
File "C:\Users\Splendor\Envs\World\lib\site-packages\django\core\management_init_.py", line 395, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "C:\Users\Splendor\Envs\World\lib\site-packages\django\core\management\base.py", line 328, in run_from_argv
self.execute(*args, **cmd_options)
File "C:\Users\Splendor\Envs\World\lib\site-packages\django\core\management\base.py", line 369, in execute
output = self.handle(*args, **options)
File "C:\Users\Splendor\Envs\World\lib\site-packages\django\core\management\base.py", line 83, in wrapped
res = handle_func(*args, **kwargs)
File "C:\Users\Splendor\Envs\World\lib\site-packages\django\core\management\commands\migrate.py", line 86, in handle
executor = MigrationExecutor(connection, self.migration_progress_callback)
File "C:\Users\Splendor\Envs\World\lib\site-packages\django\db\migrations\executor.py", line 18, in init
self.loader = MigrationLoader(self.connection)
File "C:\Users\Splendor\Envs\World\lib\site-packages\django\db\migrations\loader.py", line 49, in init
self.build_graph()
File "C:\Users\Splendor\Envs\World\lib\site-packages\django\db\migrations\loader.py", line 212, in build_graph
self.applied_migrations = recorder.applied_migrations()
File "C:\Users\Splendor\Envs\World\lib\site-packages\django\db\migrations\recorder.py", line 76, in applied_migrations
if self.has_table():
File "C:\Users\Splendor\Envs\World\lib\site-packages\django\db\migrations\recorder.py", line 56, in has_table
return self.Migration._meta.db_table in self.connection.introspection.table_names(self.connection.cursor())
File "C:\Users\Splendor\Envs\World\lib\site-packages\django\utils\asyncio.py", line 26, in inner
return func(*args, **kwargs)
File "C:\Users\Splendor\Envs\World\lib\site-packages\django\db\backends\base\base.py", line 260, in cursor
return self._cursor()
File "C:\Users\Splendor\Envs\World\lib\site-packages\django\db\backends\base\base.py", line 236, in cursor
self.ensure_connection()
File "C:\Users\Splendor\Envs\World\lib\site-packages\django\utils\asyncio.py", line 26, in inner
return func(*args, **kwargs)
File "C:\Users\Splendor\Envs\World\lib\site-packages\django\db\backends\base\base.py", line 220, in ensure_connection
self.connect()
File "C:\Users\Splendor\Envs\World\lib\site-packages\django\db\utils.py", line 90, in exit
raise dj_exc_value.with_traceback(traceback) from exc_value
File "C:\Users\Splendor\Envs\World\lib\site-packages\django\db\backends\base\base.py", line 220, in ensure_connection
self.connect()
File "C:\Users\Splendor\Envs\World\lib\site-packages\django\utils\asyncio.py", line 26, in inner
return func(*args, **kwargs)
File "C:\Users\Splendor\Envs\World\lib\site-packages\django\db\backends\base\base.py", line 197, in connect
self.connection = self.get_new_connection(conn_params)
File "C:\Users\Splendor\Envs\World\lib\site-packages\django\utils\asyncio.py", line 26, in inner
return func(*args, **kwargs)
File "C:\Users\Splendor\Envs\World\lib\site-packages\django\db\backends\postgresql\base.py", line 185, in get_new_connection
connection = Database.connect(**conn_params)
File "C:\Users\Splendor\Envs\World\lib\site-packages\psycopg2_init.py", line 127, in connect
conn = _connect(dsn, connection_factory=connection_factory, **kwasync)
django.db.utils.OperationalError
hi.
I've done Building a follow system and run the server and try following a user but it gets me this error:
Not Found: /account/users/follow/
[26/May/2020 17:24:58] "POST /account/users/follow/ HTTP/1.1" 404 1757
I copied domready block, url path and views.user_follow from github but have problem yet
After following the instructions by installing the third-party packages, and also added the cert file to my Trusted root certificates, I still don't have a secure connection
hello,I have one problem
when I use class base view , It can't render page object. and in my template it goes like this:
Page of .
It doesn't work..
I checked my view It was the same with the book.
In my base.html the {% if section... class='selected' i the li tags has no effect and the item doesn't get highlighted. However, it seems that my editor has an issue with the logic being placed inside of li particularly each of the == has different syntax highlighting. I changed quotes to single to see if that made a difference and I copied the code in the source code and again, no difference.
I have implemented the settings email etc. And the task for sending email. It is visible in the celery console. but I don't see the email in my real inbox. Out outbox from the sending email. Have down the google security softener and get in console:[2020-09-12 06:57:01,691: INFO/ForkPoolWorker-16] Task payment.tasks.payment_completed[8176d113-a447-4bf4-b7f4-ea0cf1d4d3c4] succeeded in 0.2296765129999585s: None
What do I miss in sending the email? So it arrives in my inbox with the pdf?
links doesn't work in markdown. Text renders normally with no problem only anchors does not work. I think it's a chrome based web browser issue or maybe a security fix.
Has anybody encountered the same issue?
base.css provided is not the same as the one in the book. Please update it.
Hello,
howI followed all instructions in Chapter 4 for FB login. When I check the url: https://mysite.com:8000/account/login/social-auth/complete/facebook/, how can I fix this.
The base.css file does not match the one in the book
in chapter 13 I implement the chatbox. The chat box does work in the console. But does not show code in chat screen in frontend. Cloned the example and did the installment of packages. There the chat box doesn't seem to work either. How to fix this? in cloned code and the project?
Well, I understood the type of search although it seems to be not working.
I tried to execute the command: CREATE EXTENSION pg_trgm;, but the database responded the extension already exists.
A piece of code I typed should be correct. I hope so.
If the word typed correctly - the engine won't find it. If the word is long enough as 'everything' - the engine will find it. Nonetheless if it contains a typo - the search won't find it.
It more or less works as a simple search function. I wonder why....
I am currently working on the ecommerce application and i'm stuck with the error below. I have been googling for the past 3 days looking for a solution all to no avail...👇🏿👇🏿👇🏿. The initial error i was having need i install GTk and after i successfully doing that then i began have this new error and its been driving me crazy.. would really appreciate the urgent help as i am working on a deadline..
OSError: cannot load library 'gobject-2.0': error 0x7e. Additionally, ctypes.util.find_library() did not manage to locate a library called 'gobject-2.0'
Thanks
I was trying to add the RSS feed to my blog.
The error message indicates PATH-to-my-Project/lib/python3.8/site-packages/django/db/models/query.py in get, line 415
| Request Method: | GET |
|---|---|
| http://127.0.0.1:8000/blog/feed/ | |
| 3.0.10 | |
| DoesNotExist | |
| Site matching query does not exist. |
I tried to add path to the blog url.y and it did not work.
Is there anything we have to add to models , setting or view?
Viewing an empty cart gives this error:
redis.exceptions.ResponseError: wrong number of arguments for 'zunionstore' command
how and where can I fix this?
Thanks.
ResponseError at /en/cart/
wrong number of arguments for 'zunionstore' command
recommended_products = r.suggest_products_for(cart_products, max_results=4)
r.zunionstore(tmp_key, keys)
When a product is added to the cart its fine, but when there are no products in the cart or when we remove all the products from the cart it throws this error
MultipleObjectsReturned at /account/login/
get() returned more than one User -- it returned 2!
If login with common registered email will have this error because email in User model provided by Django is not unique.
pg267
OS: Windows 10
When running celery from the shell using the provided command...
celery -A myshop worker -l info
the shell will fail once an order is placed.
ValueError: not enough values to unpack (expected 3, got 0)
According to StackOverflow, Celery 4+ is not fully supported on Windows. However, there was a solution.
pip install gevent
celery -A myshop worker -l info -P gevent
I have 2 issues :
If I split the template tag onto 2 lines then the endwith tag is seen as an error and the with tag is not recognised.
Then next issue is when clicking on the like button on the image detail nothing happens; has anyone experienced the same? Are they related?
EDIT
This is what i see in the network tab of the console
so I will probably find the problem soon and will update.
Thanks in advance
File "/Users/sueholder/.local/share/virtualenvs/bookmarks-4AItjxlP/lib/python3.8/site-packages/django/template/base.py", line 469, in parse
compile_func = self.tags[command]
KeyError: 'endwith'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/Users/sueholder/.local/share/virtualenvs/bookmarks-4AItjxlP/lib/python3.8/site-packages/django/contrib/staticfiles/handlers.py", line 68, in __call__
return self.application(environ, start_response)
File "/Users/sueholder/.local/share/virtualenvs/bookmarks-4AItjxlP/lib/python3.8/site-packages/django/core/handlers/wsgi.py", line 133, in __call__
response = self.get_response(request)
File "/Users/sueholder/.local/share/virtualenvs/bookmarks-4AItjxlP/lib/python3.8/site-packages/django/core/handlers/base.py", line 75, in get_response
response = self._middleware_chain(request)
File "/Users/sueholder/.local/share/virtualenvs/bookmarks-4AItjxlP/lib/python3.8/site-packages/django/core/handlers/exception.py", line 36, in inner
response = response_for_exception(request, exc)
File "/Users/sueholder/.local/share/virtualenvs/bookmarks-4AItjxlP/lib/python3.8/site-packages/django/core/handlers/exception.py", line 90, in response_for_exception
response = handle_uncaught_exception(request, get_resolver(get_urlconf()), sys.exc_info())
File "/Users/sueholder/.local/share/virtualenvs/bookmarks-4AItjxlP/lib/python3.8/site-packages/django/core/handlers/exception.py", line 125, in handle_uncaught_exception
return debug.technical_500_response(request, *exc_info)
File "/Users/sueholder/.local/share/virtualenvs/bookmarks-4AItjxlP/lib/python3.8/site-packages/django_extensions/management/technical_response.py", line 37, in null_technical_500_response
six.reraise(exc_type, exc_value, tb)
File "/Users/sueholder/.local/share/virtualenvs/bookmarks-4AItjxlP/lib/python3.8/site-packages/six.py", line 702, in reraise
raise value.with_traceback(tb)
File "/Users/sueholder/.local/share/virtualenvs/bookmarks-4AItjxlP/lib/python3.8/site-packages/django/core/handlers/exception.py", line 34, in inner
response = get_response(request)
File "/Users/sueholder/.local/share/virtualenvs/bookmarks-4AItjxlP/lib/python3.8/site-packages/django/core/handlers/base.py", line 115, in _get_response
response = self.process_exception_by_middleware(e, request)
File "/Users/sueholder/.local/share/virtualenvs/bookmarks-4AItjxlP/lib/python3.8/site-packages/django/core/handlers/base.py", line 113, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/Users/sueholder/Desktop/code/bookmarks/src/images/views.py", line 36, in image_detail
return render(request,
File "/Users/sueholder/.local/share/virtualenvs/bookmarks-4AItjxlP/lib/python3.8/site-packages/django/shortcuts.py", line 19, in render
content = loader.render_to_string(template_name, context, request, using=using)
File "/Users/sueholder/.local/share/virtualenvs/bookmarks-4AItjxlP/lib/python3.8/site-packages/django/template/loader.py", line 61, in render_to_string
template = get_template(template_name, using=using)
File "/Users/sueholder/.local/share/virtualenvs/bookmarks-4AItjxlP/lib/python3.8/site-packages/django/template/loader.py", line 15, in get_template
return engine.get_template(template_name)
File "/Users/sueholder/.local/share/virtualenvs/bookmarks-4AItjxlP/lib/python3.8/site-packages/django/template/backends/django.py", line 34, in get_template
return Template(self.engine.get_template(template_name), self)
File "/Users/sueholder/.local/share/virtualenvs/bookmarks-4AItjxlP/lib/python3.8/site-packages/django/template/engine.py", line 143, in get_template
template, origin = self.find_template(template_name)
File "/Users/sueholder/.local/share/virtualenvs/bookmarks-4AItjxlP/lib/python3.8/site-packages/django/template/engine.py", line 125, in find_template
template = loader.get_template(name, skip=skip)
File "/Users/sueholder/.local/share/virtualenvs/bookmarks-4AItjxlP/lib/python3.8/site-packages/django/template/loaders/base.py", line 29, in get_template
return Template(
File "/Users/sueholder/.local/share/virtualenvs/bookmarks-4AItjxlP/lib/python3.8/site-packages/django/template/base.py", line 156, in __init__
self.nodelist = self.compile_nodelist()
File "/Users/sueholder/.local/share/virtualenvs/bookmarks-4AItjxlP/lib/python3.8/site-packages/django/template/base.py", line 194, in compile_nodelist
return parser.parse()
File "/Users/sueholder/.local/share/virtualenvs/bookmarks-4AItjxlP/lib/python3.8/site-packages/django/template/base.py", line 477, in parse
raise self.error(token, e)
File "/Users/sueholder/.local/share/virtualenvs/bookmarks-4AItjxlP/lib/python3.8/site-packages/django/template/base.py", line 475, in parse
compiled_result = compile_func(self, token)
File "/Users/sueholder/.local/share/virtualenvs/bookmarks-4AItjxlP/lib/python3.8/site-packages/django/template/loader_tags.py", line 266, in do_extends
nodelist = parser.parse()
File "/Users/sueholder/.local/share/virtualenvs/bookmarks-4AItjxlP/lib/python3.8/site-packages/django/template/base.py", line 477, in parse
raise self.error(token, e)
File "/Users/sueholder/.local/share/virtualenvs/bookmarks-4AItjxlP/lib/python3.8/site-packages/django/template/base.py", line 475, in parse
compiled_result = compile_func(self, token)
File "/Users/sueholder/.local/share/virtualenvs/bookmarks-4AItjxlP/lib/python3.8/site-packages/django/template/loader_tags.py", line 209, in do_block
nodelist = parser.parse(('endblock',))
File "/Users/sueholder/.local/share/virtualenvs/bookmarks-4AItjxlP/lib/python3.8/site-packages/django/template/base.py", line 471, in parse
self.invalid_block_tag(token, command, parse_until)
File "/Users/sueholder/.local/share/virtualenvs/bookmarks-4AItjxlP/lib/python3.8/site-packages/django/template/base.py", line 521, in invalid_block_tag
raise self.error(
django.template.exceptions.TemplateSyntaxError: Invalid block tag on line 40: 'endwith', expected 'endblock'. Did you forget to register or load this tag?```
Chapter 5: Added a description and click on the BOOKMARK IT! button.
I am stuck here
urllib.error.URLError: <urlopen error [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:777)>
do_open h.set_tunnel(req._tunnel_host, headers=tunnel_headers)
 try:
 try:
 h.request(req.get_method(), req.selector, req.data, headers,
 encode_chunked=req.has_header('Transfer-encoding'))
 except OSError as err: # timeout error
 raise URLError(err)
 r = h.getresponse()
 except:
 h.close()
request self._send_output(message_body, encode_chunked=encode_chunked)
 def request(self, method, url, body=None, headers={}, *,
 encode_chunked=False):
 """Send a complete request to the server."""
 self._send_request(method, url, body, headers, encode_chunked)
 def _send_request(self, method, url, body, headers, encode_chunked):
 # Honor explicitly requested Host: and Accept-Encoding: headers.
 header_names = frozenset(k.lower() for k in headers)
 skips = {}
_send_request self.putheader(hdr, value)
 if isinstance(body, str):
 # RFC 2616 Section 3.7.1 says that text default has a
 # default charset of iso-8859-1.
 body = _encode(body, 'body')
 self.endheaders(body, encode_chunked=encode_chunked)
 def getresponse(self):
 """Get the response from the server.
 If the HTTPConnection is in the correct state, returns an
endheaders """
 if self.__state == _CS_REQ_STARTED:
 self.__state = _CS_REQ_SENT
 else:
 raise CannotSendHeader()
 self._send_output(message_body, encode_chunked=encode_chunked)
 def request(self, method, url, body=None, headers={}, *,
 encode_chunked=False):
 """Send a complete request to the server."""
 self._send_request(method, url, body, headers, encode_chunked)
_send_output A message_body may be specified, to be appended to the request.
 """
 self._buffer.extend((b"", b""))
 msg = b"\r\n".join(self._buffer)
 del self._buffer[:]
 self.send(msg)
 if message_body is not None:
 # create a consistent interface to message_body
 if hasattr(message_body, 'read'):
send file-like object that supports a .read() method, or an iterable object.
 """
 if self.sock is None:
 if self.auto_open:
 self.connect()
 else:
 raise NotConnected()
 if self.debuglevel > 0:
 print("send:", repr(data))
connect server_hostname = self._tunnel_host
 else:
 server_hostname = self.host
 self.sock = self._context.wrap_socket(self.sock,
 server_hostname=server_hostname)
 if not self._context.check_hostname and self._check_hostname:
 try:
 ssl.match_hostname(self.sock.getpeercert(), server_hostname)
 except Exception:
 self.sock.shutdown(socket.SHUT_RDWR)
wrap_socket server_hostname=None, session=None):
 return SSLSocket(sock=sock, server_side=server_side,
 do_handshake_on_connect=do_handshake_on_connect,
 suppress_ragged_eofs=suppress_ragged_eofs,
 server_hostname=server_hostname,
 _context=self, _session=session)
 def wrap_bio(self, incoming, outgoing, server_side=False,
 server_hostname=None, session=None):
 sslobj = self._wrap_bio(incoming, outgoing, server_side=server_side,
 server_hostname=server_hostname)
__init__ if do_handshake_on_connect:
 timeout = self.gettimeout()
 if timeout == 0.0:
 # non-blocking
 raise ValueError("do_handshake_on_connect should not be specified for non-blocking sockets")
 self.do_handshake()
 except (OSError, ValueError):
 self.close()
 raise
do_handshake self._check_connected()
 timeout = self.gettimeout()
 try:
 if timeout == 0.0 and block:
 self.settimeout(None)
 self._sslobj.do_handshake()
 finally:
 self.settimeout(timeout)
 def _real_connect(self, addr, connect_ex):
 if self.server_side:
do_handshake """Return the number of bytes that can be read immediately."""
 return self._sslobj.pending()
 def do_handshake(self):
 """Start the SSL/TLS handshake."""
 self._sslobj.do_handshake()
 if self.context.check_hostname:
 if not self.server_hostname:
 raise ValueError("check_hostname needs server_hostname "
 "argument")
 match_hostname(self.getpeercert(), self.server_hostname)
__call__ self.base_url = urlparse(self.get_base_url())
 super().__init__()
 def __call__(self, environ, start_response):
 if not self._should_handle(get_path_info(environ)):
 return self.application(environ, start_response)
 return super().__call__(environ, start_response)
class ASGIStaticFilesHandler(StaticFilesHandlerMixin, ASGIHandler):
 """
__call__
 def __call__(self, environ, start_response):
 set_script_prefix(get_script_name(environ))
 signals.request_started.send(sender=self.__class__, environ=environ)
 request = self.request_class(environ)
 response = self.get_response(request)
 response._handler_class = self.__class__
 status = '%d %s' % (response.status_code, response.reason_phrase)
 response_headers = [
get_response
 def get_response(self, request):
 """Return an HttpResponse object for the given HttpRequest."""
 # Setup default url resolver for this thread
 set_urlconf(settings.ROOT_URLCONF)
 response = self._middleware_chain(request)
 response._resource_closers.append(request.close)
 if response.status_code >= 400:
 log_response(
 '%s: %s', response.reason_phrase, request.path,
 response=response,
inner @wraps(get_response)
 def inner(request):
 try:
 response = get_response(request)
 except Exception as exc:
 response = response_for_exception(request, exc)
 return response
 return inner
def response_for_exception(request, exc):
response_for_exception # Allow sys.exit() to actually exit. See tickets #1023 and #4701
 raise
 else:
 signals.got_request_exception.send(sender=None, request=request)
 response = handle_uncaught_exception(request, get_resolver(get_urlconf()), sys.exc_info())
 log_response(
 '%s: %s', response.reason_phrase, request.path,
 response=response,
 request=request,
 exc_info=sys.exc_info(),
handle_uncaught_exception """
 if settings.DEBUG_PROPAGATE_EXCEPTIONS:
 raise
 if settings.DEBUG:
 return debug.technical_500_response(request, *exc_info)
 # Return an HttpResponse that displays a friendly error message.
 callback, param_dict = resolver.resolve_error_handler(500)
 return callback(request, **param_dict)
null_technical_500_response elif tld.wsgi_tb:
 tb = tld.wsgi_tb
 except AttributeError:
 pass
 six.reraise(exc_type, exc_value, tb)
reraise def reraise(tp, value, tb=None):
 try:
 if value is None:
 value = tp()
 if value.__traceback__ is not tb:
 raise value.with_traceback(tb)
 raise value
 finally:
 value = None
 tb = None
inner can rely on getting a response instead of an exception.
 """
 @wraps(get_response)
 def inner(request):
 try:
 response = get_response(request)
 except Exception as exc:
 response = response_for_exception(request, exc)
 return response
 return inner
_get_response if response is None:
 wrapped_callback = self.make_view_atomic(callback)
 try:
 response = wrapped_callback(request, *callback_args, **callback_kwargs)
 except Exception as e:
 response = self.process_exception_by_middleware(e, request)
 # Complain if the view returned None (a common error).
 if response is None:
 if isinstance(callback, types.FunctionType): # FBV
 view_name = callback.__name__
_get_response break
 if response is None:
 wrapped_callback = self.make_view_atomic(callback)
 try:
 response = wrapped_callback(request, *callback_args, **callback_kwargs)
 except Exception as e:
 response = self.process_exception_by_middleware(e, request)
 # Complain if the view returned None (a common error).
 if response is None:
_wrapped_view
 def decorator(view_func):
 @wraps(view_func)
 def _wrapped_view(request, *args, **kwargs):
 if test_func(request.user):
 return view_func(request, *args, **kwargs)
 path = request.build_absolute_uri()
 resolved_login_url = resolve_url(login_url or settings.LOGIN_URL)
 # If the login url is the same scheme and net location then just
 # use the path as the "next" url.
 login_scheme, login_netloc = urlparse(resolved_login_url)[:2]
image_create # form is sent
 form = ImageCreateForm(data=request.POST)
 if form.is_valid():
 # form data is valid
 cd = form.cleaned_data
 new_item = form.save(commit=False)
 # assign current user to the item
 new_item.user = request.user
 new_item.save()
 messages.success(request, 'Image added successfully')
save name = slugify(image.title)
 extension = image_url.rsplit('.', 1)[1].lower()
 image_name = f'{name}.{extension}'
 # download image from the given URL
 response = request.urlopen(image_url)
 image.image.save(image_name,
 ContentFile(response.read()),
 save=False)
 if commit:
 image.save()
urlopen opener = build_opener(https_handler)
 elif _opener is None:
 _opener = opener = build_opener()
 else:
 opener = _opener
 return opener.open(url, data, timeout)
def install_opener(opener):
 global _opener
 _opener = opener
open meth_name = protocol+"_request"
 for processor in self.process_request.get(protocol, []):
 meth = getattr(processor, meth_name)
 req = meth(req)
 response = self._open(req, data)
 # post-process response
 meth_name = protocol+"_response"
 for processor in self.process_response.get(protocol, []):
 meth = getattr(processor, meth_name)
_open if result:
 return result
 protocol = req.type
 result = self._call_chain(self.handle_open, protocol, protocol +
 '_open', req)
 if result:
 return result
 return self._call_chain(self.handle_open, 'unknown',
 'unknown_open', req)
_call_chain # the request, or return None if they can't but another handler
 # could. Otherwise, they return the response.
 handlers = chain.get(kind, ())
 for handler in handlers:
 func = getattr(handler, meth_name)
 result = func(*args)
 if result is not None:
 return result
 def open(self, fullurl, data=None, timeout=socket._GLOBAL_DEFAULT_TIMEOUT):
 # accept a URL or a Request object
https_open self._context = context
 self._check_hostname = check_hostname
 def https_open(self, req):
 return self.do_open(http.client.HTTPSConnection, req,
 context=self._context, check_hostname=self._check_hostname)
 https_request = AbstractHTTPHandler.do_request_
 __all__.append('HTTPSHandler')
do_open try:
 try:
 h.request(req.get_method(), req.selector, req.data, headers,
 encode_chunked=req.has_header('Transfer-encoding'))
 except OSError as err: # timeout error
 raise URLError(err)
 r = h.getresponse()
 except:
 h.close()
 raise
urllib.error.URLError: <urlopen error [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:777)>
This is the Copy/Paste friendly version of the traceback. You can also paste this traceback into a gist:
Traceback (most recent call last):
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/urllib/request.py", line 1318, in do_open
encode_chunked=req.has_header('Transfer-encoding'))
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/http/client.py", line 1239, in request
self._send_request(method, url, body, headers, encode_chunked)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/http/client.py", line 1285, in _send_request
self.endheaders(body, encode_chunked=encode_chunked)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/http/client.py", line 1234, in endheaders
self._send_output(message_body, encode_chunked=encode_chunked)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/http/client.py", line 1026, in _send_output
self.send(msg)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/http/client.py", line 964, in send
self.connect()
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/http/client.py", line 1400, in connect
server_hostname=server_hostname)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/ssl.py", line 407, in wrap_socket
_context=self, _session=session)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/ssl.py", line 814, in __init__
self.do_handshake()
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/ssl.py", line 1068, in do_handshake
self._sslobj.do_handshake()
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/ssl.py", line 689, in do_handshake
self._sslobj.do_handshake()
ssl.SSLError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:777)
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/Users/dpthegrey/PROJECTS/django3_social_website/env/bookmarks/lib/python3.6/site-packages/django/contrib/staticfiles/handlers.py", line 68, in __call__
return self.application(environ, start_response)
File "/Users/dpthegrey/PROJECTS/django3_social_website/env/bookmarks/lib/python3.6/site-packages/django/core/handlers/wsgi.py", line 133, in __call__
response = self.get_response(request)
File "/Users/dpthegrey/PROJECTS/django3_social_website/env/bookmarks/lib/python3.6/site-packages/django/core/handlers/base.py", line 75, in get_response
response = self._middleware_chain(request)
File "/Users/dpthegrey/PROJECTS/django3_social_website/env/bookmarks/lib/python3.6/site-packages/django/core/handlers/exception.py", line 36, in inner
response = response_for_exception(request, exc)
File "/Users/dpthegrey/PROJECTS/django3_social_website/env/bookmarks/lib/python3.6/site-packages/django/core/handlers/exception.py", line 90, in response_for_exception
response = handle_uncaught_exception(request, get_resolver(get_urlconf()), sys.exc_info())
File "/Users/dpthegrey/PROJECTS/django3_social_website/env/bookmarks/lib/python3.6/site-packages/django/core/handlers/exception.py", line 125, in handle_uncaught_exception
return debug.technical_500_response(request, *exc_info)
File "/Users/dpthegrey/PROJECTS/django3_social_website/env/bookmarks/lib/python3.6/site-packages/django_extensions/management/technical_response.py", line 37, in null_technical_500_response
six.reraise(exc_type, exc_value, tb)
File "/Users/dpthegrey/PROJECTS/django3_social_website/env/bookmarks/lib/python3.6/site-packages/six.py", line 702, in reraise
raise value.with_traceback(tb)
File "/Users/dpthegrey/PROJECTS/django3_social_website/env/bookmarks/lib/python3.6/site-packages/django/core/handlers/exception.py", line 34, in inner
response = get_response(request)
File "/Users/dpthegrey/PROJECTS/django3_social_website/env/bookmarks/lib/python3.6/site-packages/django/core/handlers/base.py", line 115, in _get_response
response = self.process_exception_by_middleware(e, request)
File "/Users/dpthegrey/PROJECTS/django3_social_website/env/bookmarks/lib/python3.6/site-packages/django/core/handlers/base.py", line 113, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/Users/dpthegrey/PROJECTS/django3_social_website/env/bookmarks/lib/python3.6/site-packages/django/contrib/auth/decorators.py", line 21, in _wrapped_view
return view_func(request, *args, **kwargs)
File "/Users/dpthegrey/PROJECTS/django3_social_website/bookmarks/images/views.py", line 15, in image_create
new_item = form.save(commit=False)
File "/Users/dpthegrey/PROJECTS/django3_social_website/bookmarks/images/forms.py", line 38, in save
response = request.urlopen(image_url)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/urllib/request.py", line 223, in urlopen
return opener.open(url, data, timeout)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/urllib/request.py", line 526, in open
response = self._open(req, data)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/urllib/request.py", line 544, in _open
'_open', req)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/urllib/request.py", line 504, in _call_chain
result = func(*args)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/urllib/request.py", line 1361, in https_open
context=self._context, check_hostname=self._check_hostname)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/urllib/request.py", line 1320, in do_open
raise URLError(err)
urllib.error.URLError:
To switch between the interactive traceback and the plaintext one, you can click on the "Traceback" headline. From the text traceback you can also create a paste of it. For code execution mouse-over the frame you want to debug and click on the console icon on the right side.
You can execute arbitrary Python code in the stack frames and there are some extra helpers available for introspection:
dump() shows all variables in the framedump(obj) dumps all that's known about the objectThe console is locked and needs to be unlocked by entering the PIN. You can find the PIN printed out on the standard output of your shell that runs the server.
PIN:
Added bookmarklet to bookmark toolbar. opened amazon.com clicked on an image. clicked on bookmarklet nothing happens.
I can't load my templates
Wow! I've reached the chapter 3 and there was a problem I couldn't have dealt with.
The author asks readers to run the following commands:
su postgres
createuser -dP blog
I wonder.... if he tried to run the commands himself? I spent many hours trying to understand how it works.
I found the same issue in stackoverflow
https://stackoverflow.com/questions/53672593/using-postgres-shell-to-createuser
many other tutorials like..... change your password in .pgpass or pgpass.conf which is located at %APPDATA%\postgresql\ - actually it isn't! Then I read a dozen other tutorials how to create a user .... bla-bla-bla-bla! Nothing has work!
Eventually, I did as I'd done when I was reading Django for Professionals by William S. Vincent.
Once you clicked on PostgreSQL's install it will ask you for a password. Type: postgres
When it finishes installing the database go to settings.py of your project, comment out the older one
# DATABASES = {
# 'default': {
# 'ENGINE': 'django.db.backends.sqlite3',
# 'NAME': os.path.join(BASE_DIR, 'db.sqlite3'),
# }
# }
and paste the text:
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.postgresql',
'NAME': 'postgres',
'USER': 'postgres',
'PASSWORD': 'postgres',
'HOST': '127.0.0.1',
'PORT': '5432',
}
}
That's it! I've saved your time! Now you owe me!
Chapter 9 Suggestion:
products_bought method from recommender.py is nowhere being called.
Suggestion to add in tasks.py the following code:
order = Order.objects.get(id=order_id)
order_items = order.items.all()
products = []
for oi in order_items:
products.append(oi.product)
recommender = Recommender()
recommender.products_bought(products)
The author asks his readers to add some lines into base.html when we use a build-in Django authentication log in and log out views:
Here's the snippet of code in base.html, basically, you have to change:
Hello {{ request.user.first_name}}, to Hello {{ request.user.username}},
<span class="user">
{% if request.user.is_authenticated %}
#Hello {{ request.user.first_name}}, # Typo.
Hello {{ request.user.username}},
<a href="{% url 'logout' %}">Logout</a>
{% else %}
<a href="{% url 'login' %}">Login</a>
{% endif %}
</span>
One won't get an error however it would be displayed "Hello, Logout".
p.s. #page 107, typo in the following text: You display the user's first name and a link to log out if the user is authenticated, or a link to log in otherwise
I have found that when a user without a profile photo likes an image the following error occurs "photo attribute has no file associated with it"
Anyone else?
There is a cd variable assigned in bookmarks/images/views.py but never used. Is there any reason for it???
I am working on t chapter 4 section Extending the user model. I do not have any idea where profile from profile_form = ProfileEditForm(instance=request.user.profile, data=request.POST, files=request.FILES) is coming from. Moreover, when I tried to run it I am getting error User has no profile. I have followed each and every steps according to section Extending the user model.Please help. Thanks
Chapter 9 throws an error if all the products from the cart are removed.
The following should be added to recommender.py
def suggest_products_for(self, products, max_results=6):
product_ids = [p.id for p in products]
if len(products) == 0:
return []
I am on 4th chapter the book Django 3 by example and I noticed one thing that we are only creating views from Django's authentication framework but we are not telling those views which template to render when.
For example, how does my application would know that it needs to only render the logged_out.html template when we try to access the logout view? If I try to change the name of the file from logged_out.html to loggedout.html then it takes me to the Django's admin logout page.
Why?
The CSS files included in chapter 7 in this code don't conform to the ones shown in the images examples from the book. The CSS files present in the code for Chapter 7 are the same used in Chapters 5 and 6.
Could I have the CSS files for Chapter 7?
Wat could cause this?
Traceback Switch to copy-and-paste view
t/Software_project/educa/venv/lib/python3.8/site-packages/django/core/handlers/exception.py, line 47, in inner
response = get_response(request) …
▶ Local vars
Software_project/educa/venv/lib/python3.8/site-packages/django/core/handlers/base.py, line 179, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs) …
▶ Local vars
/Software_project/educa/venv/lib/python3.8/site-packages/django/views/generic/base.py, line 73, in view
return self.dispatch(request, *args, **kwargs) …
▶ Local vars
oftware_project/educa/courses/views.py, line 110, in dispatch
self.model = self.get_model(model_name) …
▶ Local vars
t/Software_project/educa/courses/views.py, line 95, in get_model
return apps.get_model(app_label='courses', …
▶ Local vars
On pg433 "Installing Memcached", it directs the user to install Memcached, but only provides instructions for Mac/Linux.
After some research, I found that Memcached is not officialy supported on Windows. My first thought was that as a windows user, I wouldn't be able to participate in this part of the book. However, there are work-arounds, and the one that I found was to use the same WSL (Windows Subsystem Linux) that I used during the Redis portion of the book to also install and run memcached (Another alternative is using a memcached binary file, but the terminal method just seemed more appropriate). This also made me realize that I can use WSL as a tool to run various linux services as well as familiarize myself with the terminal as a whole.
sudo apt-get updatesudo apt-get install memcachedmemcached -l 127.0.0.1:11211-d flag to the command.memcached -d -l 127.0.0.1:11211pos aux and then enter kill idThe only issue I had with it was that once you add memcached monitoring to the to the admin site, the bar graph is always red (which means full) however the stats below it prove otherwise.
Looks like this is a problem with the django-memcache-status package. However, Antonio has already made a pull-request to fix it. Editing the file manually works until the request can be merged and a new release is made.
P.S
Almost done with the book and its been AMAZING! Gracias Antonio, aprendí bastante y voy a seguir usando el libro para referencia!
everything is working fine in chapter 7 but the quantity variable is not working, i mean except quantity option/field every other field (name, category, price, description) is visible on the detail page. Please help!
I went through the building a social site chapter. Facebook, Twitter, Goolge will let me create Bookmark user accounts but since it bypasses registration a user profile doesn't get made. Where do we create the user profile when social auth is used?
I'm getting a 404 error when accessing the homepage at URL http://127.0.0.1/. The only way I can get to the post list is by going to http://127.0.0.1/blog. The code is identical to the code in this GitHub repository. I tried the code on Window 10 and Ubuntu Linux 18.04 and got the same results. I am using Python 3.8.5 and Django 3.0.10.
This is a screenshot of the error message:
mysite/urls.py
"""mysite URL Configuration
The `urlpatterns` list routes URLs to views. For more information please see:
https://docs.djangoproject.com/en/3.0/topics/http/urls/
Examples:
Function views
1. Add an import: from my_app import views
2. Add a URL to urlpatterns: path('', views.home, name='home')
Class-based views
1. Add an import: from other_app.views import Home
2. Add a URL to urlpatterns: path('', Home.as_view(), name='home')
Including another URLconf
1. Import the include() function: from django.urls import include, path
2. Add a URL to urlpatterns: path('blog/', include('blog.urls'))
"""
from django.contrib import admin
from django.urls import path, include
from django.contrib.sitemaps.views import sitemap
from blog.sitemaps import PostSitemap
sitemaps = {
'posts': PostSitemap,
}
urlpatterns = [
path('admin/', admin.site.urls),
path('blog/', include('blog.urls', namespace='blog')),
path('sitemap.xml', sitemap, {'sitemaps': sitemaps},
name='django.contrib.sitemaps.views.sitemap')
]
blog/urls.py
from django.urls import path
from . import views
from .feeds import LatestPostsFeed
app_name = 'blog'
urlpatterns = [
# post views
path('', views.post_list, name='post_list'),
path('tag/<slug:tag_slug>/', views.post_list, name='post_list_by_tag'),
# path('', views.PostListView.as_view(), name='post_list'),
path('<int:year>/<int:month>/<int:day>/<slug:post>/', views.post_detail, name='post_detail'),
path('<int:post_id>/share/', views.post_share, name='post_share'),
path('feed/', LatestPostsFeed(), name='post_feed'),
path('search/', views.post_search, name='post_search'),
]
blog/views.py
from django.db.models import Count
from django.shortcuts import render, get_object_or_404
from django.core.paginator import Paginator, EmptyPage,\
PageNotAnInteger
from django.core.mail import send_mail
from django.views.generic import ListView
from django.contrib.postgres.search import SearchVector, SearchQuery, SearchRank
from django.contrib.postgres.search import TrigramSimilarity
from .models import Post, Comment
from .forms import EmailPostForm, CommentForm, SearchForm
from taggit.models import Tag
def post_list(request, tag_slug=None):
object_list = Post.published.all()
tag = None
if tag_slug:
tag = get_object_or_404(Tag, slug=tag_slug)
object_list = object_list.filter(tags__in=[tag])
paginator = Paginator(object_list, 3) # 3 posts in each page
page = request.GET.get('page')
try:
posts = paginator.page(page)
except PageNotAnInteger:
# If page is not an integer deliver the first page
posts = paginator.page(1)
except EmptyPage:
# If page is out of range deliver last page of results
posts = paginator.page(paginator.num_pages)
return render(request,
'blog/post/list.html',
{'page': page,
'posts': posts,
'tag': tag})
def post_detail(request, year, month, day, post):
post = get_object_or_404(Post, slug=post,
status='published',
publish__year=year,
publish__month=month,
publish__day=day)
# List of active comments for this post
comments = post.comments.filter(active=True)
new_comment = None
if request.method == 'POST':
# A comment was posted
comment_form = CommentForm(data=request.POST)
if comment_form.is_valid():
# Create Comment object but don't save to database yet
new_comment = comment_form.save(commit=False)
# Assign the current post to the comment
new_comment.post = post
# Save the comment to the database
new_comment.save()
else:
comment_form = CommentForm()
# List of similar posts
post_tags_ids = post.tags.values_list('id', flat=True)
similar_posts = Post.published.filter(tags__in=post_tags_ids)\
.exclude(id=post.id)
similar_posts = similar_posts.annotate(same_tags=Count('tags'))\
.order_by('-same_tags','-publish')[:4]
return render(request,
'blog/post/detail.html',
{'post': post,
'comments': comments,
'new_comment': new_comment,
'comment_form': comment_form,
'similar_posts': similar_posts})
class PostListView(ListView):
queryset = Post.published.all()
context_object_name = 'posts'
paginate_by = 3
template_name = 'blog/post/list.html'
def post_share(request, post_id):
# Retrieve post by id
post = get_object_or_404(Post, id=post_id, status='published')
sent = False
if request.method == 'POST':
# Form was submitted
form = EmailPostForm(request.POST)
if form.is_valid():
# Form fields passed validation
cd = form.cleaned_data
post_url = request.build_absolute_uri(post.get_absolute_url())
subject = f"{cd['name']} recommends you read {post.title}"
message = f"Read {post.title} at {post_url}\n\n" \
f"{cd['name']}\'s comments: {cd['comments']}"
send_mail(subject, message, '[email protected]', [cd['to']])
sent = True
else:
form = EmailPostForm()
return render(request, 'blog/post/share.html', {'post': post,
'form': form,
'sent': sent})
def post_search(request):
form = SearchForm()
query = None
results = []
if 'query' in request.GET:
form = SearchForm(request.GET)
if form.is_valid():
query = form.cleaned_data['query']
results = Post.published.annotate(
similarity=TrigramSimilarity('title', query),
).filter(similarity__gt=0.1).order_by('-similarity')
return render(request,
'blog/post/search.html',
{'form': form,
'query': query,
'results': results})
Let me know if you need additional information. Thanks
Hello,
get_absolute_url generates the link as "2020/12/9slug" not "2020/12/9/slug".
How to add the missing "/"?
So... I am having this problem where whenever I try to add a Module to a Course, I get an attribute error: "Module' object has no attribute 'courses'".
For the life of me, I cannot figure out what I did wrong. I looked through all my views in courses/views.py and everything seems right...Where is this problem stemming from?
File "C:\Users\tilli\Desktop\projects\educa\courses\fields.py", line 19, in pre_save for field in self.for_fields}
File "C:\Users\tilli\Desktop\projects\educa\courses\fields.py", line 19, in <dictcomp> for field in self.for_fields}
AttributeError: 'Module' object has no attribute 'courses'
I am, however, able to add new Modules through Django Admin
Even after adding template name in my urls.py, I still don't get any improvement
from django.urls import path
from .views import UserRegisterView, AddProductView, CategoryView, UserEditView, PasswordsChangeView
from django.contrib.auth import views as auth_views
from . import views
from .views import *
app_name = 'members'
urlpatterns = [
# path('signup/', UserRegisterView.as_view(), name='signup'),
# path('account/', UserEditView.as_view(), name='edit_account'),
path('account/', views.edit, name='edit_account'),
path('signup/', views.signup, name='signup'),
path('activate/<slug:uidb64>/<slug:token>/', views.activate, name='activate'),
# path('password/', auth_views.PasswordChangeView.as_view(template_name='registration/change_password.html')),
path('password/', PasswordsChangeView.as_view(template_name='registration/change_password.html'), name='password'),
path('add_product/', AddProductView.as_view(), name='add_product'),
path('add_category/', CategoryView.as_view(), name='add_category'),
path('password_reset/', auth_views.PasswordResetView.as_view(template_name='registration/password_reset.html'),
name='password_reset'),
path('password_reset/done/',
auth_views.PasswordResetDoneView.as_view(template_name='registration/password_reset_done.html'),
name='password_reset_done'),
path('reset/<uidb64>/<token>/',
auth_views.PasswordResetConfirmView.as_view(template_name='registration/password_reset_confirm.html'),
name='password_reset_confirm'),
path('reset/done/',
auth_views.PasswordResetCompleteView.as_view(template_name='registration/password_reset_complete.html'),
name='password_reset_complete'),
]
It only works for this path('password_reset/', auth_views.PasswordResetView.as_view(template_name='registration/password_reset.html'), name='password_reset'),
Thanks for your help
I am in the section Registering customer orders and when I run the command python manage.py startapp orders I get the error: CommandError: 'orders' conflicts with the name of an existing Python module and cannot be used as an app name. Please try another name.
Someone with the same problem? How can I solve that? Thanks.
In chapter 4 your add
AUTHENTICATION_BACKENDS = [
'django.contrib.auth.backends.ModelBackend',
'account.authentication.EmailAuthBackend',
]
this gives me the following error
ModuleNotFoundError: No module named 'account.authentication'
When I remove AUTHENTICATION_BACKENDS = [
'django.contrib.auth.backends.ModelBackend',
'account.authentication.EmailAuthBackend',
] I can login with password and username
this workes
AUTHENTICATION_BACKENDS = [
'django.contrib.auth.backends.ModelBackend',
]
this does not
AUTHENTICATION_BACKENDS = [
'django.contrib.auth.backends.ModelBackend',
'account.authentication.EmailAuthBackend',
]
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