Exception has occurred: Variabledoesnotexist - Django

Question

Exception has occurred: Variabledoesnotexist - Django

Asked 5 years, 3 months ago

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Hey, guys, I got a mistake I can’t figure out why. I am creating a simple web client registration app with Django, I am using vscode with text editor.

When I start the application the error described in the question description occurs, only this error happens only when I start using the dupurador of vscode for Django, the error comes from the index.html file where the code line below is:

{% if error_message %}  
    <div class="alert alert-danger alert-dismissible show" role="alert">
    {{ error_message }}
    <button type="button" class="close" style="color:white" data-dismiss="alert" aria-label="Close">
        <span aria-hidden="true">&times;</span>
    </button>
    </div>>
{% endif %}

py views.

def index(request):
    clients = service_client.get_all() #service_client é uma variavel global que instancia minha classe de serviço
    context_view = {'clients':clients}

    if 'messages' in request.session:
        messages = request.session.pop('messages')
        context_view.update(messages)

    return render(request, 'core/index.html', context= context_view)

adding messages through the Section

request.session['messages'] = {'success_message':'minha mensagem'}

When I run normally with the remote python Manage.py runserver works normally

Complete error:

Exception has occurred: VariableDoesNotExist
Failed lookup for key [error_message] in [{'True': True, 'False': False, 'None': None}, {'csrf_token': <SimpleLazyObject: <function csrf.<locals>._get_val at 0x07BAD858>>, 'request': <WSGIRequest: GET '/'>, 'user': <SimpleLazyObject: <function AuthenticationMiddleware.process_request.<locals>.<lambda> at 0x07AF9A08>>, 'perms': <django.contrib.auth.context_processors.PermWrapper object at 0x07BD7830>, 'messages': <django.contrib.messages.storage.fallback.FallbackStorage object at 0x07B896D0>, 'DEFAULT_MESSAGE_LEVELS': {'DEBUG': 10, 'INFO': 20, 'SUCCESS': 25, 'WARNING': 30, 'ERROR': 40}}, {}, {'clients': <QuerySet [<Client: Pai Do Pai>, <Client: Pai Do Robson>, <Client: Lucas Moraes Da Silva>]>}, {'block': <Block Node: content. Contents: [<TextNode: '\n\n'>, <IfNode>, <TextNode: '\n\n'>, <IfNode>, <TextNode: '\n    <div class="row">\n  '>, <ForNode: for c in clients, tail_len: 17>, <TextNode: '\n                    </tb'>, <django.template.defaulttags.URLNode object at 0x07BA9F90>, <TextNode: '" class="btn btn-success"'>]>}]
  File "C:\Users\robso\ambientes_virtuais\Painel_administrativo\Lib\site-packages\django\template\base.py", line 850, in _resolve_lookup
    (bit, current))  # missing attribute
  File "C:\Users\robso\ambientes_virtuais\Painel_administrativo\Lib\site-packages\django\template\base.py", line 796, in resolve
    value = self._resolve_lookup(context)
  File "C:\Users\robso\ambientes_virtuais\Painel_administrativo\Lib\site-packages\django\template\base.py", line 671, in resolve
    obj = self.var.resolve(context)
  File "C:\Users\robso\ambientes_virtuais\Painel_administrativo\Lib\site-packages\django\template\defaulttags.py", line 875, in eval
    return self.value.resolve(context, ignore_failures=True)
  File "C:\Users\robso\ambientes_virtuais\Painel_administrativo\Lib\site-packages\django\template\defaulttags.py", line 302, in render
    match = condition.eval(context)
  File "C:\Users\robso\ambientes_virtuais\Painel_administrativo\Lib\site-packages\django\template\base.py", line 904, in render_annotated
    return self.render(context)
  File "C:\Users\robso\ambientes_virtuais\Painel_administrativo\Lib\site-packages\django\template\base.py", line 937, in render
    bit = node.render_annotated(context)
  File "C:\Users\robso\ambientes_virtuais\Painel_administrativo\Lib\site-packages\django\template\loader_tags.py", line 62, in render
    result = block.nodelist.render(context)
  File "C:\Users\robso\ambientes_virtuais\Painel_administrativo\Lib\site-packages\django\template\base.py", line 904, in render_annotated
    return self.render(context)
  File "C:\Users\robso\ambientes_virtuais\Painel_administrativo\Lib\site-packages\django\template\base.py", line 937, in render
    bit = node.render_annotated(context)
  File "C:\Users\robso\ambientes_virtuais\Painel_administrativo\Lib\site-packages\django\template\base.py", line 163, in _render
    return self.nodelist.render(context)
  File "C:\Users\robso\ambientes_virtuais\Painel_administrativo\Lib\site-packages\django\template\loader_tags.py", line 150, in render
    return compiled_parent._render(context)
  File "C:\Users\robso\ambientes_virtuais\Painel_administrativo\Lib\site-packages\django\template\base.py", line 904, in render_annotated
    return self.render(context)
  File "C:\Users\robso\ambientes_virtuais\Painel_administrativo\Lib\site-packages\django\template\base.py", line 937, in render
    bit = node.render_annotated(context)
  File "C:\Users\robso\ambientes_virtuais\Painel_administrativo\Lib\site-packages\django\template\base.py", line 163, in _render
    return self.nodelist.render(context)
  File "C:\Users\robso\ambientes_virtuais\Painel_administrativo\Lib\site-packages\django\template\base.py", line 171, in render
    return self._render(context)
  File "C:\Users\robso\ambientes_virtuais\Painel_administrativo\Lib\site-packages\django\template\backends\django.py", line 61, in render
    return self.template.render(context)
  File "C:\Users\robso\ambientes_virtuais\Painel_administrativo\Lib\site-packages\django\template\loader.py", line 62, in render_to_string
    return template.render(context, request)
  File "C:\Users\robso\ambientes_virtuais\Painel_administrativo\Lib\site-packages\django\shortcuts.py", line 36, in render
    content = loader.render_to_string(template_name, context, request, using=using)
  File "C:\Users\robso\ambientes_virtuais\PainelAdministrativo\cadcli\core\views.py", line 21, in index
    return render(request, 'core/index.html', context= context_view)
  File "C:\Users\robso\ambientes_virtuais\Painel_administrativo\Lib\site-packages\django\views\decorators\http.py", line 40, in inner
    return func(request, *args, **kwargs)
  File "C:\Users\robso\ambientes_virtuais\Painel_administrativo\Lib\site-packages\django\core\handlers\base.py", line 124, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "C:\Users\robso\ambientes_virtuais\Painel_administrativo\Lib\site-packages\django\core\handlers\exception.py", line 34, in inner
    response = get_response(request)
  File "C:\Users\robso\ambientes_virtuais\Painel_administrativo\Lib\site-packages\django\utils\deprecation.py", line 91, in __call__
    response = response or self.get_response(request)
  File "C:\Users\robso\ambientes_virtuais\Painel_administrativo\Lib\site-packages\django\core\handlers\exception.py", line 34, in inner
    response = get_response(request)
  File "C:\Users\robso\ambientes_virtuais\Painel_administrativo\Lib\site-packages\django\utils\deprecation.py", line 91, in __call__
    response = response or self.get_response(request)
  File "C:\Users\robso\ambientes_virtuais\Painel_administrativo\Lib\site-packages\django\core\handlers\exception.py", line 34, in inner
    response = get_response(request)
  File "C:\Users\robso\ambientes_virtuais\Painel_administrativo\Lib\site-packages\django\utils\deprecation.py", line 91, in __call__
    response = response or self.get_response(request)
  File "C:\Users\robso\ambientes_virtuais\Painel_administrativo\Lib\site-packages\django\core\handlers\exception.py", line 34, in inner
    response = get_response(request)
  File "C:\Users\robso\ambientes_virtuais\Painel_administrativo\Lib\site-packages\django\utils\deprecation.py", line 91, in __call__
    response = response or self.get_response(request)
  File "C:\Users\robso\ambientes_virtuais\Painel_administrativo\Lib\site-packages\django\core\handlers\exception.py", line 34, in inner
    response = get_response(request)
  File "C:\Users\robso\ambientes_virtuais\Painel_administrativo\Lib\site-packages\django\utils\deprecation.py", line 91, in __call__
    response = response or self.get_response(request)
  File "C:\Users\robso\ambientes_virtuais\Painel_administrativo\Lib\site-packages\django\core\handlers\exception.py", line 34, in inner
    response = get_response(request)
  File "C:\Users\robso\ambientes_virtuais\Painel_administrativo\Lib\site-packages\django\utils\deprecation.py", line 91, in __call__
    response = response or self.get_response(request)
  File "C:\Users\robso\ambientes_virtuais\Painel_administrativo\Lib\site-packages\django\core\handlers\exception.py", line 34, in inner
    response = get_response(request)
  File "C:\Users\robso\ambientes_virtuais\Painel_administrativo\Lib\site-packages\django\utils\deprecation.py", line 91, in __call__
    response = response or self.get_response(request)
  File "C:\Users\robso\ambientes_virtuais\Painel_administrativo\Lib\site-packages\django\core\handlers\exception.py", line 34, in inner
    response = get_response(request)
  File "C:\Users\robso\ambientes_virtuais\Painel_administrativo\Lib\site-packages\django\core\handlers\base.py", line 78, in get_response
    response = self._middleware_chain(request)
  File "C:\Users\robso\ambientes_virtuais\Painel_administrativo\Lib\site-packages\django\core\handlers\wsgi.py", line 142, in __call__
    response = self.get_response(request)
  File "C:\Users\robso\ambientes_virtuais\Painel_administrativo\Lib\site-packages\django\contrib\staticfiles\handlers.py", line 65, in __call__
    return self.application(environ, start_response)
  File "C:\Users\robso\AppData\Local\Programs\Python\Python37-32\Lib\wsgiref\handlers.py", line 137, in run
    self.result = application(self.environ, self.start_response)
  File "C:\Users\robso\ambientes_virtuais\Painel_administrativo\Lib\site-packages\django\core\servers\basehttp.py", line 194, in handle_one_request
    handler.run(self.server.get_app())
  File "C:\Users\robso\ambientes_virtuais\Painel_administrativo\Lib\site-packages\django\core\servers\basehttp.py", line 169, in handle
    self.handle_one_request()
  File "C:\Users\robso\AppData\Local\Programs\Python\Python37-32\Lib\socketserver.py", line 720, in __init__
    self.handle()
  File "C:\Users\robso\AppData\Local\Programs\Python\Python37-32\Lib\socketserver.py", line 360, in finish_request
    self.RequestHandlerClass(request, client_address, self)
  File "C:\Users\robso\AppData\Local\Programs\Python\Python37-32\Lib\socketserver.py", line 347, in process_request
    self.finish_request(request, client_address)
  File "C:\Users\robso\AppData\Local\Programs\Python\Python37-32\Lib\socketserver.py", line 316, in _handle_request_noblock
    self.process_request(request, client_address)
  File "C:\Users\robso\AppData\Local\Programs\Python\Python37-32\Lib\socketserver.py", line 237, in serve_forever
    self._handle_request_noblock()
  File "C:\Users\robso\ambientes_virtuais\Painel_administrativo\Lib\site-packages\django\core\servers\basehttp.py", line 213, in run
    httpd.serve_forever()
  File "C:\Users\robso\ambientes_virtuais\Painel_administrativo\Lib\site-packages\django\core\management\commands\runserver.py", line 139, in inner_run
    ipv6=self.use_ipv6, threading=threading, server_cls=self.server_cls)
  File "C:\Users\robso\ambientes_virtuais\Painel_administrativo\Lib\site-packages\django\core\management\commands\runserver.py", line 104, in run
    self.inner_run(None, **options)
  File "C:\Users\robso\ambientes_virtuais\Painel_administrativo\Lib\site-packages\django\core\management\commands\runserver.py", line 95, in handle
    self.run(**options)
  File "C:\Users\robso\ambientes_virtuais\Painel_administrativo\Lib\site-packages\django\core\management\base.py", line 353, in execute
    output = self.handle(*args, **options)
  File "C:\Users\robso\ambientes_virtuais\Painel_administrativo\Lib\site-packages\django\core\management\commands\runserver.py", line 60, in execute
    super().execute(*args, **options)
  File "C:\Users\robso\ambientes_virtuais\Painel_administrativo\Lib\site-packages\django\core\management\base.py", line 316, in run_from_argv
    self.execute(*args, **cmd_options)
  File "C:\Users\robso\ambientes_virtuais\Painel_administrativo\Lib\site-packages\django\core\management\__init__.py", line 375, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "C:\Users\robso\ambientes_virtuais\Painel_administrativo\Lib\site-packages\django\core\management\__init__.py", line 381, in execute_from_command_line
    utility.execute()
  File "C:\Users\robso\ambientes_virtuais\PainelAdministrativo\cadcli\manage.py", line 15, in <module>
    execute_from_command_line(sys.argv)
  File "C:\Users\robso\AppData\Local\Programs\Python\Python37-32\Lib\runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "C:\Users\robso\AppData\Local\Programs\Python\Python37-32\Lib\runpy.py", line 96, in _run_module_code
    mod_name, mod_spec, pkg_name, script_name)
  File "C:\Users\robso\AppData\Local\Programs\Python\Python37-32\Lib\runpy.py", line 263, in run_path
    pkg_name=pkg_name, script_name=fname)

Dude.. I’m not going to try to answer because although I really like the vscode, I did not answer on Jango. For me there is no way to use another editor/ide for python projects other than pycharm, even in the community version.

– Sidon

2019/03/27 at 19:37
So Sidon, I’m starting now in python, and I’m seeing the best options also of editors and everything, I have vscode and I really like programming in C# por la, and I saw that you have the option of using in python so I’m saving, but in pycharm it is difficult to have these types of configuration error, because it already comes preconfigured for python projects. Well let’s see if there’s any solution to this in case I don’t have to continue with pycharm anyway.

– Robson Silva

2019/03/27 at 19:55
The cool of vscode is that in Django projects it manages to debug, in pycharm only in the professional version.

– Robson Silva

2019/03/27 at 20:15
1

The debug of Django is in the browser itself, just turn on the variable DEBUG in settings.py, it makes no sense to want to debug by IDE (I remember q used only once), if you want an even more powerful debug, install the Django debug Toolbar

– Sidon

2019/03/27 at 20:34
See if you can’t solve the vscode problem by following this tutorial, if you haven’t already done it

– Sidon

2019/03/27 at 20:44

No answers

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