I am working on a tutorial by Dave Gray. Everything was working fine up till when I did the Challenge in chapter 8. When I now run the development server I get an error saying Error during template rendering. In template C:\Users\ZACKAMATA\Documents\Learn Python\Django\Dave Gray\Lesson01\myproject\templates\layout.html
, error at line 19
‘set’ object is not reversible
This is the layout.html file
Environment:
Request Method: GET
Request URL: http://127.0.0.1:8000/
Django Version: 5.1.4
Python Version: 3.12.3
Installed Applications:
['django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'posts',
'users']
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 error:
In template C:\Users\ZACKAMATA\Documents\Learn Python\Django\Dave Gray\Lesson01\myproject\templates\layout.html, error at line 19
'set' object is not reversible
9 : Django App
10 : {% endblock title %}
11 : </title>
12 : <link rel="stylesheet" href="{% static 'css/style.css' %}">
13 : <script src="{% static 'js/main.js' %}" defer></script>
14 : </head>
15 : <body>
16 : <nav>
17 : <a href="/">Home</a>
18 : <a href="/about">About</a>
19 : <a href=" {% url 'posts:list' %} ">Posts</a>
20 : </nav>
21 : <main>
22 : {% block content %}
23 : {% endblock content %}
24 : </main>
25 : </body>
26 : </html>
Traceback (most recent call last):
File "C:\Users\ZACKAMATA\Documents\Learn Python\Django\Dave Gray\Lesson01\.venv\Lib\site-packages\django\core\handlers\exception.py", line 55, in inner
response = get_response(request)
^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\ZACKAMATA\Documents\Learn Python\Django\Dave Gray\Lesson01\.venv\Lib\site-packages\django\core\handlers\base.py", line 197, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\ZACKAMATA\Documents\Learn Python\Django\Dave Gray\Lesson01\myproject\myproject\views.py", line 7, in homepage
return render(request, "home.html")
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\ZACKAMATA\Documents\Learn Python\Django\Dave Gray\Lesson01\.venv\Lib\site-packages\django\shortcuts.py", line 25, in render
content = loader.render_to_string(template_name, context, request, using=using)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\ZACKAMATA\Documents\Learn Python\Django\Dave Gray\Lesson01\.venv\Lib\site-packages\django\template\loader.py", line 62, in render_to_string
return template.render(context, request)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\ZACKAMATA\Documents\Learn Python\Django\Dave Gray\Lesson01\.venv\Lib\site-packages\django\template\backends\django.py", line 107, in render
return self.template.render(context)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\ZACKAMATA\Documents\Learn Python\Django\Dave Gray\Lesson01\.venv\Lib\site-packages\django\template\base.py", line 171, in render
return self._render(context)
^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\ZACKAMATA\Documents\Learn Python\Django\Dave Gray\Lesson01\.venv\Lib\site-packages\django\template\base.py", line 163, in _render
return self.nodelist.render(context)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\ZACKAMATA\Documents\Learn Python\Django\Dave Gray\Lesson01\.venv\Lib\site-packages\django\template\base.py", line 1008, in render
return SafeString("".join([node.render_annotated(context) for node in self]))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\ZACKAMATA\Documents\Learn Python\Django\Dave Gray\Lesson01\.venv\Lib\site-packages\django\template\base.py", line 969, in render_annotated
return self.render(context)
^^^^^^^^^^^^^^^^^^^^
File "C:\Users\ZACKAMATA\Documents\Learn Python\Django\Dave Gray\Lesson01\.venv\Lib\site-packages\django\template\loader_tags.py", line 159, in render
return compiled_parent._render(context)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\ZACKAMATA\Documents\Learn Python\Django\Dave Gray\Lesson01\.venv\Lib\site-packages\django\template\base.py", line 163, in _render
return self.nodelist.render(context)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\ZACKAMATA\Documents\Learn Python\Django\Dave Gray\Lesson01\.venv\Lib\site-packages\django\template\base.py", line 1008, in render
return SafeString("".join([node.render_annotated(context) for node in self]))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\ZACKAMATA\Documents\Learn Python\Django\Dave Gray\Lesson01\.venv\Lib\site-packages\django\template\base.py", line 969, in render_annotated
return self.render(context)
^^^^^^^^^^^^^^^^^^^^
File "C:\Users\ZACKAMATA\Documents\Learn Python\Django\Dave Gray\Lesson01\.venv\Lib\site-packages\django\template\defaulttags.py", line 480, in render
url = reverse(view_name, args=args, kwargs=kwargs, current_app=current_app)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\ZACKAMATA\Documents\Learn Python\Django\Dave Gray\Lesson01\.venv\Lib\site-packages\django\urls\base.py", line 54, in reverse
app_list = resolver.app_dict[ns]
^^^^^^^^^^^^^^^^^
File "C:\Users\ZACKAMATA\Documents\Learn Python\Django\Dave Gray\Lesson01\.venv\Lib\site-packages\django\urls\resolvers.py", line 637, in app_dict
self._populate()
^^^^^^^^^^^^^^^^
File "C:\Users\ZACKAMATA\Documents\Learn Python\Django\Dave Gray\Lesson01\.venv\Lib\site-packages\django\urls\resolvers.py", line 574, in _populate
url_pattern._populate()
^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\ZACKAMATA\Documents\Learn Python\Django\Dave Gray\Lesson01\.venv\Lib\site-packages\django\urls\resolvers.py", line 548, in _populate
for url_pattern in reversed(self.url_patterns):
^^^^^^^^^^^^^^^^^^^^^^^^^^^
Exception Type: TypeError at /
Exception Value: 'set' object is not reversible