NoReverseMatch--Seems that Django doesn't detect the app url

[Michael Starr]

I have a pet memorial project, and some urls in pet_memorial

pet memorial urls.py

from django.contrib import admin

from django.urls import path, include

from . import views

urlpatterns = [

    path('admin/', admin.site.urls),

    path('home/', views.HomeView.as_view(), name='home_view'),

    path('', include('pet_profile.urls')),

]

and some urls in the pet_profile app

pet profile app urls.py

from django.contrib import admin

from django.urls import path

from pet_profile import views

urlpatterns = [

    path("pet/<slug:slug>/", views.PetDetailView.as_view(), name = "pet_profile"),

    path("owner/<slug:slug>/", views.PetOwnerProfileView.as_view(), name = "owner_profile"),

]

As you can see, pet memorial urls has an include call which includes the pet profile urls, so theoretically it should be checking for all urls whether they are in the project or in the app.

Now, I am trying to use the owner_profile url name to create a template-tagg'd anchor url link to the pet_owner_profile.html template.

home.html

{% extends "base.html" %}

{% block header %}

   

{% endblock %}

{% block content %}

    <a href="{% url 'owner_profile' %}">test</a>

{% endblock %}

In the views file I previously had template_name set to home.html, but now it is pet_owner_profile.html. I think that makes more sense? Otherwise the link would point back to itself.

views.py

from django.shortcuts import render

from django.views.generic import (TemplateView,ListView,

                                  DetailView,CreateView,

                                  UpdateView,DeleteView)

from pet_profile.models import PetOwner, Pet, PetPhoto, PetStory

class PetOwnerListView(ListView):

    model = PetOwner

    context_object_name = "owner_list"

    template_name = "home.html"

class PetOwnerProfileView(DetailView):

    model = PetOwner

    context_object_name = "owner"

    template_name = "pet_owner_profile.html"

class PetListView(ListView):

    model = Pet

    context_object_name = "pet_list"

class PetDetailView(DetailView):

    model = Pet

    context_object_name = "pet"

class PetPhotoListView(ListView):

    model = PetPhoto

    context_object_name = "pet_photo_list"

class PetPhotoDetailView(DetailView):

    model = PetPhoto

    context_object_name = "pet_photo"

class PetStoryListView(ListView):

    model = PetStory

    context_object_name = "pet_story_list"

class PetStoryDetailView(DetailView):

    model = PetStory

    context_object_name = "pet_story"

In either case, I get a noreversematch error when trying to render the home html page that includes the url template tag with owner_profile as the template tag name. It is a valid url name so I don't understand why it doesn't detect it. I don't know quite what's going on.

error:

NoReverseMatch at /home/ Reverse for 'owner_profile' with no arguments not found. 1 pattern(s) tried: ['owner/(?P<slug>[-a-zA-Z0-9_]+)/\\Z']
Request Method:
GET
Request URL:
http://127.0.0.1:8000/home/
Django Version:
4.1.7
Exception Type:
NoReverseMatch
Exception Value:
Reverse for 'owner_profile' with no arguments not found. 1 pattern(s) tried: ['owner/(?P<slug>[-a-zA-Z0-9_]+)/\\Z']
Exception Location:
C:\Users\starr\Code\pet_memorial\.venv\Lib\site-packages\django\urls\resolvers.py, line 828, in _reverse_with_prefix
Raised during:
pet_memorial.views.HomeView
Python Executable:
C:\Users\starr\Code\pet_memorial\.venv\Scripts\python.exe
Python Version:
3.11.2
Python Path:
['C:\\Users\\starr\\Code\\pet_memorial', 'C:\\Program Files\\Python311\\python311.zip', 'C:\\Program Files\\Python311\\DLLs', 'C:\\Program Files\\Python311\\Lib', 'C:\\Program Files\\Python311', 'C:\\Users\\starr\\Code\\pet_memorial\\.venv', 'C:\\Users\\starr\\Code\\pet_memorial\\.venv\\Lib\\site-packages']
Server time:
Sat, 25 Feb 2023 20:15:57 +0000

Error during template rendering

In template C:\Users\starr\Code\pet_memorial\pet_memorial\templates\pet_memorial\home.html, error at line 6

Reverse for 'owner_profile' with no arguments not found. 1 pattern(s) tried: ['owner/(?P<slug>[-a-zA-Z0-9_]+)/\\Z']
1
{% extends "base.html" %}
2
{% block header %}
3

4
{% endblock %}
5
{% block content %}
6
<a href="{% url 'owner_profile' %}">test</a>
7

8
{% endblock %}

Traceback Switch to copy-and-paste view

• C:\Users\starr\Code\pet_memorial\.venv\Lib\site-packages\django\core\handlers\exception.py, line 56, in inner
  56. response = get_response(request) …
  Local vars
• C:\Users\starr\Code\pet_memorial\.venv\Lib\site-packages\django\core\handlers\base.py, line 220, in _get_response
  220. response = response.render() …
  Local vars
• C:\Users\starr\Code\pet_memorial\.venv\Lib\site-packages\django\template\response.py, line 114, in render
  114. self.content = self.rendered_content …
  Local vars
• C:\Users\starr\Code\pet_memorial\.venv\Lib\site-packages\django\template\response.py, line 92, in rendered_content
  92. return template.render(context, self._request) …
  Local vars
• C:\Users\starr\Code\pet_memorial\.venv\Lib\site-packages\django\template\backends\django.py, line 61, in render
  61. return self.template.render(context) …
  Local vars
• C:\Users\starr\Code\pet_memorial\.venv\Lib\site-packages\django\template\base.py, line 175, in render
  175. return self._render(context) …
  Local vars
• C:\Users\starr\Code\pet_memorial\.venv\Lib\site-packages\django\template\base.py, line 167, in _render
  167. return self.nodelist.render(context) …
  Local vars
• C:\Users\starr\Code\pet_memorial\.venv\Lib\site-packages\django\template\base.py, line 1005, in render
  1005. return SafeString("".join([node.render_annotated(context) for node in self])) …
  Local vars
• C:\Users\starr\Code\pet_memorial\.venv\Lib\site-packages\django\template\base.py, line 1005, in <listcomp>
  1005. return SafeString("".join([node.render_annotated(context) for node in self])) …
  Local vars
• C:\Users\starr\Code\pet_memorial\.venv\Lib\site-packages\django\template\base.py, line 966, in render_annotated
  966. return self.render(context) …
  Local vars
• C:\Users\starr\Code\pet_memorial\.venv\Lib\site-packages\django\template\loader_tags.py, line 157, in render
  157. return compiled_parent._render(context) …
  Local vars
• C:\Users\starr\Code\pet_memorial\.venv\Lib\site-packages\django\template\base.py, line 167, in _render
  167. return self.nodelist.render(context) …
  Local vars
• C:\Users\starr\Code\pet_memorial\.venv\Lib\site-packages\django\template\base.py, line 1005, in render
  1005. return SafeString("".join([node.render_annotated(context) for node in self])) …
  Local vars
• C:\Users\starr\Code\pet_memorial\.venv\Lib\site-packages\django\template\base.py, line 1005, in <listcomp>
  1005. return SafeString("".join([node.render_annotated(context) for node in self])) …
  Local vars
• C:\Users\starr\Code\pet_memorial\.venv\Lib\site-packages\django\template\base.py, line 966, in render_annotated
  966. return self.render(context) …
  Local vars
• C:\Users\starr\Code\pet_memorial\.venv\Lib\site-packages\django\template\loader_tags.py, line 63, in render
  63. result = block.nodelist.render(context) …
  Local vars
• C:\Users\starr\Code\pet_memorial\.venv\Lib\site-packages\django\template\base.py, line 1005, in render
  1005. return SafeString("".join([node.render_annotated(context) for node in self])) …
  Local vars
• C:\Users\starr\Code\pet_memorial\.venv\Lib\site-packages\django\template\base.py, line 1005, in <listcomp>
  1005. return SafeString("".join([node.render_annotated(context) for node in self])) …
  Local vars
• C:\Users\starr\Code\pet_memorial\.venv\Lib\site-packages\django\template\base.py, line 966, in render_annotated
  966. return self.render(context) …
  Local vars
• C:\Users\starr\Code\pet_memorial\.venv\Lib\site-packages\django\template\defaulttags.py, line 471, in render
  471. url = reverse(view_name, args=args, kwargs=kwargs, current_app=current_app) …
  Local vars
• C:\Users\starr\Code\pet_memorial\.venv\Lib\site-packages\django\urls\base.py, line 88, in reverse
  88. return resolver._reverse_with_prefix(view, prefix, *args, **kwargs) …
  Local vars
• C:\Users\starr\Code\pet_memorial\.venv\Lib\site-packages\django\urls\resolvers.py, line 828, in _reverse_with_prefix
  828. raise NoReverseMatch(msg) …
  Local vars

Request information USER

starr

GET

No GET data

POST

No POST data

FILES

No FILES data

COOKIES
Variable
Value
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'vyMGMPTzLclJ6K3awA182THxQiX4RFO8'
sessionid
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COMMONPROGRAMFILES(X86)
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COMMONPROGRAMW6432
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HTTP_ACCEPT_LANGUAGE
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HTTP_CONNECTION
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HTTP_COOKIE
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wsgi.version
(1, 0) Settings Using settings module pet_memorial.settings
Setting
Value
ABSOLUTE_URL_OVERRIDES
{}
ADMINS
[]
ALLOWED_HOSTS
[]
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True
AUTHENTICATION_BACKENDS
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2621440
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100
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'N j, Y, P'
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['%Y-%m-%d %H:%M:%S', '%Y-%m-%d %H:%M:%S.%f', '%Y-%m-%d %H:%M', '%m/%d/%Y %H:%M:%S', '%m/%d/%Y %H:%M:%S.%f', '%m/%d/%Y %H:%M', '%m/%d/%y %H:%M:%S', '%m/%d/%y %H:%M:%S.%f', '%m/%d/%y %H:%M']
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'django.views.debug.SafeExceptionReporterFilter'
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'django.core.files.storage.FileSystemStorage'
DEFAULT_FROM_EMAIL
'webmaster@localhost'
DEFAULT_INDEX_TABLESPACE
''
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''
DISALLOWED_USER_AGENTS
[]
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'django.core.mail.backends.smtp.EmailBackend'
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''
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25
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'********************'
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'[Django] '
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2621440
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420
FILE_UPLOAD_TEMP_DIR
None
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0
FIXTURE_DIRS
[]
FORCE_SCRIPT_NAME
None
FORMAT_MODULE_PATH
None
FORM_RENDERER
'django.forms.renderers.DjangoTemplates'
IGNORABLE_404_URLS
[]
INSTALLED_APPS
['django.contrib.admin', 'django.contrib.auth', 'django.contrib.contenttypes', 'django.contrib.sessions', 'django.contrib.messages', 'django.contrib.staticfiles', 'pet_profile']
INTERNAL_IPS
[]
LANGUAGES
[('af', 'Afrikaans'), ('ar', 'Arabic'), ('ar-dz', 'Algerian Arabic'), ('ast', 'Asturian'), ('az', 'Azerbaijani'), ('bg', 'Bulgarian'), ('be', 'Belarusian'), ('bn', 'Bengali'), ('br', 'Breton'), ('bs', 'Bosnian'), ('ca', 'Catalan'), ('cs', 'Czech'), ('cy', 'Welsh'), ('da', 'Danish'), ('de', 'German'), ('dsb', 'Lower Sorbian'), ('el', 'Greek'), ('en', 'English'), ('en-au', 'Australian English'), ('en-gb', 'British English'), ('eo', 'Esperanto'), ('es', 'Spanish'), ('es-ar', 'Argentinian Spanish'), ('es-co', 'Colombian Spanish'), ('es-mx', 'Mexican Spanish'), ('es-ni', 'Nicaraguan Spanish'), ('es-ve', 'Venezuelan Spanish'), ('et', 'Estonian'), ('eu', 'Basque'), ('fa', 'Persian'), ('fi', 'Finnish'), ('fr', 'French'), ('fy', 'Frisian'), ('ga', 'Irish'), ('gd', 'Scottish Gaelic'), ('gl', 'Galician'), ('he', 'Hebrew'), ('hi', 'Hindi'), ('hr', 'Croatian'), ('hsb', 'Upper Sorbian'), ('hu', 'Hungarian'), ('hy', 'Armenian'), ('ia', 'Interlingua'), ('id', 'Indonesian'), ('ig', 'Igbo'), ('io', 'Ido'), ('is', 'Icelandic'), ('it', 'Italian'), ('ja', 'Japanese'), ('ka', 'Georgian'), ('kab', 'Kabyle'), ('kk', 'Kazakh'), ('km', 'Khmer'), ('kn', 'Kannada'), ('ko', 'Korean'), ('ky', 'Kyrgyz'), ('lb', 'Luxembourgish'), ('lt', 'Lithuanian'), ('lv', 'Latvian'), ('mk', 'Macedonian'), ('ml', 'Malayalam'), ('mn', 'Mongolian'), ('mr', 'Marathi'), ('ms', 'Malay'), ('my', 'Burmese'), ('nb', 'Norwegian Bokmål'), ('ne', 'Nepali'), ('nl', 'Dutch'), ('nn', 'Norwegian Nynorsk'), ('os', 'Ossetic'), ('pa', 'Punjabi'), ('pl', 'Polish'), ('pt', 'Portuguese'), ('pt-br', 'Brazilian Portuguese'), ('ro', 'Romanian'), ('ru', 'Russian'), ('sk', 'Slovak'), ('sl', 'Slovenian'), ('sq', 'Albanian'), ('sr', 'Serbian'), ('sr-latn', 'Serbian Latin'), ('sv', 'Swedish'), ('sw', 'Swahili'), ('ta', 'Tamil'), ('te', 'Telugu'), ('tg', 'Tajik'), ('th', 'Thai'), ('tk', 'Turkmen'), ('tr', 'Turkish'), ('tt', 'Tatar'), ('udm', 'Udmurt'), ('uk', 'Ukrainian'), ('ur', 'Urdu'), ('uz', 'Uzbek'), ('vi', 'Vietnamese'), ('zh-hans', 'Simplified Chinese'), ('zh-hant', 'Traditional Chinese')]
LANGUAGES_BIDI
['he', 'ar', 'ar-dz', 'fa', 'ur']
LANGUAGE_CODE
'en-us'
LANGUAGE_COOKIE_AGE
None
LANGUAGE_COOKIE_DOMAIN
None
LANGUAGE_COOKIE_HTTPONLY
False
LANGUAGE_COOKIE_NAME
'django_language'
LANGUAGE_COOKIE_PATH
'/'
LANGUAGE_COOKIE_SAMESITE
None
LANGUAGE_COOKIE_SECURE
False
LOCALE_PATHS
[]
LOGGING
{}
LOGGING_CONFIG
'logging.config.dictConfig'
LOGIN_REDIRECT_URL
'/accounts/profile/'
LOGIN_URL
'/accounts/login/'
LOGOUT_REDIRECT_URL
None
MANAGERS
[]
MEDIA_ROOT
''
MEDIA_URL
'/'
MESSAGE_STORAGE
'django.contrib.messages.storage.fallback.FallbackStorage'
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']
MIGRATION_MODULES
{}
MONTH_DAY_FORMAT
'F j'
NUMBER_GROUPING
0
PASSWORD_HASHERS
'********************'
PASSWORD_RESET_TIMEOUT
'********************'
PREPEND_WWW
False
ROOT_URLCONF
'pet_memorial.urls'
SECRET_KEY
'********************'
SECRET_KEY_FALLBACKS
'********************'
SECURE_CONTENT_TYPE_NOSNIFF
True
SECURE_CROSS_ORIGIN_OPENER_POLICY
'same-origin'
SECURE_HSTS_INCLUDE_SUBDOMAINS
False
SECURE_HSTS_PRELOAD
False
SECURE_HSTS_SECONDS
0
SECURE_PROXY_SSL_HEADER
None
SECURE_REDIRECT_EXEMPT
[]
SECURE_REFERRER_POLICY
'same-origin'
SECURE_SSL_HOST
None
SECURE_SSL_REDIRECT
False
SERVER_EMAIL
'root@localhost'
SESSION_CACHE_ALIAS
'default'
SESSION_COOKIE_AGE
1209600
SESSION_COOKIE_DOMAIN
None
SESSION_COOKIE_HTTPONLY
True
SESSION_COOKIE_NAME
'sessionid'
SESSION_COOKIE_PATH
'/'
SESSION_COOKIE_SAMESITE
'Lax'
SESSION_COOKIE_SECURE
False
SESSION_ENGINE
'django.contrib.sessions.backends.db'
SESSION_EXPIRE_AT_BROWSER_CLOSE
False
SESSION_FILE_PATH
None
SESSION_SAVE_EVERY_REQUEST
False
SESSION_SERIALIZER
'django.contrib.sessions.serializers.JSONSerializer'
SETTINGS_MODULE
'pet_memorial.settings'
SHORT_DATETIME_FORMAT
'm/d/Y P'
SHORT_DATE_FORMAT
'm/d/Y'
SIGNING_BACKEND
'django.core.signing.TimestampSigner'
SILENCED_SYSTEM_CHECKS
[]
STATICFILES_DIRS
[]
STATICFILES_FINDERS
['django.contrib.staticfiles.finders.FileSystemFinder', 'django.contrib.staticfiles.finders.AppDirectoriesFinder']
STATICFILES_STORAGE
'django.contrib.staticfiles.storage.StaticFilesStorage'
STATIC_ROOT
None
STATIC_URL
'/static/'
TEMPLATES
[{'APP_DIRS': True, 'BACKEND': 'django.template.backends.django.DjangoTemplates', 'DIRS': ['C:\\Users\\starr\\Code\\pet_memorial\\pet_memorial/templates/pet_memorial/', 'C:\\Users\\starr\\Code\\pet_memorial\\pet_profile/templates/pet_profile/'], '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']}}]
TEMPLATE_APP_DIR
'C:\\Users\\starr\\Code\\pet_memorial\\pet_profile/templates/pet_profile/'
TEMPLATE_PROJECT_DIR
'C:\\Users\\starr\\Code\\pet_memorial\\pet_memorial/templates/pet_memorial/'
TEST_NON_SERIALIZED_APPS
[]
TEST_RUNNER
'django.test.runner.DiscoverRunner'
THOUSAND_SEPARATOR
','
TIME_FORMAT
'P'
TIME_INPUT_FORMATS
['%H:%M:%S', '%H:%M:%S.%f', '%H:%M']
TIME_ZONE
'UTC'
USE_DEPRECATED_PYTZ
False
USE_I18N
True
USE_L10N
True
USE_THOUSAND_SEPARATOR
False
USE_TZ
True
USE_X_FORWARDED_HOST
False
USE_X_FORWARDED_PORT
False
WSGI_APPLICATION
'pet_memorial.wsgi.application'
X_FRAME_OPTIONS
'DENY'
YEAR_MONTH_FORMAT
'F Y'

You’re seeing this error because you have DEBUG = True in your Django settings file. Change that to False, and Django will display a standard page generated by the handler for this status code.

I understand my code isn't the cleanest, but I don't see why the core mechanism of url template tagging to a url named in one of the urls.py files isn't working.

Any help is appreciated.

Michael

[Michael Starr]

I have found some resources in the mangy mess of disorganized misinformation known as the internet

{% extends "base.html" %}

{% block header %}

   

{% endblock %}

{% block content %}

    <a href="{% url 'owner_profile' slug=owner.slug %}">test</a>

{% endblock %}

is my new home.html template. Note that I am trying to pass in slug by delineating explicitly "slug=" and  "owner" comes from the parameter name in the view (or should)

class PetOwnerProfileView(DetailView):

    model = PetOwner

    context_object_name = "owner"

    template_name = "pet_owner_profile.html"

as you can see, I have "context_oibject_name = "owner"". Which is correct syntax, I have tested it and found it in numerous resources.

What's strange is there are nearly NO RESOURCES on google regarding how to simply pass in a slug as a parameter to a url template tag in django.

This is the only relevant website I found:

https://forum.djangoproject.com/t/django-how-to-add-slug-as-arguments-in-url-tag-using-django/12636

to quote:

desphixs

Mar '22

i want to add slug in url using django like this <a href="{% url 'base:tutorial-page' p.slug p.slug2 %}" </a> i dont really know how to pass in double slug in the url for example: i want to access the html page before going to the tutorial page related to html.

getting-started.html

{% for p in prglangcat %}> {{ p.title }} <a href="{% url 'base:tutorial-page' p.slug p.slug %}" </a> {% endfor %}

views.py

def gettingStarted(request): prglangcat = ProgrammingLanguagesCategory.objects.all() context = { 'prglangcat': prglangcat } return render(request, 'base/getting-started.html', context) def programmingLanguageTutorial(request, prg_slug, prglangcat): prglangcat = ProgrammingLanguagesCategory.objects.get(slug=prglangcat_slug) prglangtut = ProgrammingLanguageTutorial.objects.get(slug=prg_slug, prglangcat=prglangcat) context = { 'prglangtut': prglangtut } return render(request, 'base/tutorial-page.html', context)

models.py

class ProgrammingLanguagesCategory(models.Model): title = models.CharField(max_length=100) icon = models.ImageField(upload_to='programming-category', default="default.jpg") description = models.TextField(default="Learn ...") slug = models.SlugField(max_length=100, unique=True) def get_absolute_url(self): return reverse('programming-languages-category', args=[self.slug]) def __str__(self): return self.title class ProgrammingLanguageTutorial(models.Model): prglangcat = models.ForeignKey(ProgrammingLanguagesCategory, on_delete=models.CASCADE, null=True) slug = models.SlugField(max_length=10000, unique=True) title = models.CharField(max_length=10000) description = models.TextField(null=True) image = models.ImageField(upload_to='Tutorial Image', default="default.jpg", null=True) code_snippet = models.CharField(max_length=1000000000, null=True, blank=True) video_url = models.URLField(null=True) views = models.IntegerField(default=0) def __str__(self): return self.title

urls.py

app_name = 'base' urlpatterns = [ path('', views.index, name="index"), path('getting-started/', views.gettingStarted, name="getting-started"), path('getting-started/<slug:prglangcat_slug>/<slug:prg_slug>', views.programmingLanguageTutorial, name="tutorial-page"), ]

taceback

NoReverseMatch at /getting-started/ Reverse for 'tutorial-page' with no arguments not found. 1 pattern(s) tried: ['getting\\-started/(?P<prglangcat_slug>[-a-zA-Z0-9_]+)/(?P<prg_slug>[-a-zA-Z0-9_]+)

what i have tried
{% url 'base:tutorial-page' prg_slug=p.prg_slug prglangcat_slug=p.prglangcat_slug%}

Perfect. Now then - how would you refer to a field named slug in that same object? Finally then, that is what you need to use in your template to access the slug field in the url tag, if in your template you have an object named p that is referring to an instance of ProgrammingLanguagesCategory.

But there's no note as to whether the [context variable name].[slugname] is the correct way to do it or not, in the end.

They're sort of roundabout and quizzical in that they ask more questions instead of actually helping or answering them. Very Yoda, having a good time I see they are.

But this doesn't work. I now get the error:

NoReverseMatch at /home/ Reverse for 'owner_profile' with keyword arguments '{'slug': ''}' not found. 1 pattern(s) tried: ['owner/(?P<slug>[-a-zA-Z0-9_]+)/\\Z']
Request Method:
GET
Request URL:
http://127.0.0.1:8000/home/
Django Version:
4.1.7
Exception Type:
NoReverseMatch
Exception Value:
Reverse for 'owner_profile' with keyword arguments '{'slug': ''}' not found. 1 pattern(s) tried: ['owner/(?P<slug>[-a-zA-Z0-9_]+)/\\Z']
Exception Location:

C:\Users\starr\Code\pet_memorial\.venv\Lib\site-packages\django\urls\resolvers.py, line 828, in _reverse_with_prefix

Raised during:
pet_memorial.views.HomeView
Python Executable:

C:\Users\starr\Code\pet_memorial\.venv\Scripts\python.exe

Python Version:
3.11.2
Python Path:

['C:\\Users\\starr\\Code\\pet_memorial', 'C:\\Program Files\\Python311\\python311.zip', 'C:\\Program Files\\Python311\\DLLs', 'C:\\Program Files\\Python311\\Lib', 'C:\\Program Files\\Python311', 'C:\\Users\\starr\\Code\\pet_memorial\\.venv', 'C:\\Users\\starr\\Code\\pet_memorial\\.venv\\Lib\\site-packages']

Server time:
Tue, 28 Feb 2023 23:12:12 +0000

Error during template rendering

In template C:\Users\starr\Code\pet_memorial\pet_memorial\templates\pet_memorial\home.html, error at line 6

Reverse for 'owner_profile' with keyword arguments '{'slug': ''}' not found. 1 pattern(s) tried: ['owner/(?P<slug>[-a-zA-Z0-9_]+)/\\Z']
1
{% extends "base.html" %}
2
{% block header %}
3

4
{% endblock %}
5
{% block content %}

6
<a href="{% url 'owner_profile' slug=owner.slug %}">test</a>
7
{% endblock %}

COOKIES
Variable
Value
csrftoken
'l6JTjHi46PwSI1jYALvcH9SSo517mqhE'
sessionid
'nc60k9j7w318bzh707je4ekwhfbszyvb' META
Variable
Value
ALLUSERSPROFILE
'C:\\ProgramData'
APPDATA

'C:\\Users\\starr\\AppData\\Roaming'

CHOCOLATEYINSTALL
'C:\\ProgramData\\chocolatey'
CHOCOLATEYLASTPATHUPDATE
'132763030117094841'
CHROME_CRASHPAD_PIPE_NAME
'\\\\.\\pipe\\LOCAL\\crashpad_7356_VDJSPXLOEBBONWTJ'
COLORTERM
'truecolor'
COMMONPROGRAMFILES

'C:\\Program Files\\Common Files'

COMMONPROGRAMFILES(X86)

'C:\\Program Files (x86)\\Common Files'

COMMONPROGRAMW6432

'C:\\Program Files\\Common Files'

COMPUTERNAME
'DAFFY'
COMSPEC
'C:\\WINDOWS\\system32\\cmd.exe'
CONFIGSETROOT
'C:\\WINDOWS\\ConfigSetRoot'
CONTENT_LENGTH
''
CONTENT_TYPE
'text/plain'
CSRF_COOKIE
'l6JTjHi46PwSI1jYALvcH9SSo517mqhE'
DJANGO_SETTINGS_MODULE
'pet_memorial.settings'
DRIVERDATA

'C:\\Windows\\System32\\Drivers\\DriverData'

GATEWAY_INTERFACE
'CGI/1.1'
GIT_ASKPASS
'********************'
HOMEDRIVE
'C:'
HOMEPATH
'\\Users\\starr'
HTTP_ACCEPT
'text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8'
HTTP_ACCEPT_ENCODING
'gzip, deflate, br'
HTTP_ACCEPT_LANGUAGE
'en-US,en;q=0.5'
HTTP_CONNECTION
'keep-alive'
HTTP_COOKIE
('csrftoken=l6JTjHi46PwSI1jYALvcH9SSo517mqhE; ' 'sessionid=nc60k9j7w318bzh707je4ekwhfbszyvb')
HTTP_HOST
'127.0.0.1:8000'
HTTP_SEC_FETCH_DEST
'document'
HTTP_SEC_FETCH_MODE
'navigate'
HTTP_SEC_FETCH_SITE
'none'
HTTP_SEC_FETCH_USER
'?1'
HTTP_SEC_GPC
'1'
HTTP_UPGRADE_INSECURE_REQUESTS
'1'
HTTP_USER_AGENT

LANG
'en_US.UTF-8'
LOCALAPPDATA

LOGONSERVER
'\\\\DAFFY'
NUMBER_OF_PROCESSORS
'12'
ONEDRIVE
'C:\\Users\\starr\\OneDrive'
ONEDRIVECONSUMER
'C:\\Users\\starr\\OneDrive'
ORIGINAL_XDG_CURRENT_DESKTOP
'undefined'
OS
'Windows_NT'
PATH

PATHEXT

PATH_INFO
'/home/'
PROCESSOR_ARCHITECTURE
'AMD64'
PROCESSOR_IDENTIFIER

PROCESSOR_LEVEL
'6'
PROCESSOR_REVISION
'9e0a'
PROGRAMDATA
'C:\\ProgramData'
PROGRAMFILES
'C:\\Program Files'
PROGRAMFILES(X86)
'C:\\Program Files (x86)'
PROGRAMW6432
'C:\\Program Files'
PSMODULEPATH

PUBLIC
'C:\\Users\\Public'
QUERY_STRING
''
REMOTE_ADDR
'127.0.0.1'
REMOTE_HOST
''
REQUEST_METHOD
'GET'
RUN_MAIN
'true'
SCRIPT_NAME
''
SERVER_NAME
'Daffy'
SERVER_PORT
'8000'
SERVER_PROTOCOL
'HTTP/1.1'
SERVER_SOFTWARE
'WSGIServer/0.2'
SESSIONNAME
'Console'
SYSTEMDRIVE
'C:'
SYSTEMROOT
'C:\\WINDOWS'
TEMP

TERM_PROGRAM
'vscode'
TERM_PROGRAM_VERSION
'1.75.1'
TMP

USERDOMAIN
'DAFFY'
USERDOMAIN_ROAMINGPROFILE
'DAFFY'
USERNAME
'starr'
USERPROFILE
'C:\\Users\\starr'
VIRTUAL_ENV

VIRTUAL_ENV_PROMPT
'.venv'
VSCODE_GIT_ASKPASS_EXTRA_ARGS
'********************'
VSCODE_GIT_ASKPASS_MAIN
'********************'
VSCODE_GIT_ASKPASS_NODE
'********************'
VSCODE_GIT_IPC_HANDLE
'\\\\.\\pipe\\vscode-git-74a970d2f2-sock'
VSCODE_INJECTION
'1'
WINDIR
'C:\\WINDOWS'
ZES_ENABLE_SYSMAN
'1'
_OLD_VIRTUAL_PATH

wsgi.errors

wsgi.file_wrapper
<class 'wsgiref.util.FileWrapper'>
wsgi.input
<django.core.handlers.wsgi.LimitedStream object at 0x000001FC91517410>
wsgi.multiprocess
False
wsgi.multithread
True
wsgi.run_once
False
wsgi.url_scheme
'http'
wsgi.version
(1, 0) Settings Using settings module pet_memorial.settings
Setting
Value
ABSOLUTE_URL_OVERRIDES
{}
ADMINS
[]
ALLOWED_HOSTS
[]
APPEND_SLASH
True
AUTHENTICATION_BACKENDS
['django.contrib.auth.backends.ModelBackend']
AUTH_PASSWORD_VALIDATORS
'********************'
AUTH_USER_MODEL
'auth.User'
BASE_DIR

CACHES
{'default': {'BACKEND': 'django.core.cache.backends.locmem.LocMemCache'}}
CACHE_MIDDLEWARE_ALIAS
'default'
CACHE_MIDDLEWARE_KEY_PREFIX
'********************'
CACHE_MIDDLEWARE_SECONDS
600
CSRF_COOKIE_AGE
31449600
CSRF_COOKIE_DOMAIN
None
CSRF_COOKIE_HTTPONLY
False
CSRF_COOKIE_MASKED
False
CSRF_COOKIE_NAME
'csrftoken'
CSRF_COOKIE_PATH
'/'
CSRF_COOKIE_SAMESITE
'Lax'
CSRF_COOKIE_SECURE
False
CSRF_FAILURE_VIEW
'django.views.csrf.csrf_failure'
CSRF_HEADER_NAME
'HTTP_X_CSRFTOKEN'
CSRF_TRUSTED_ORIGINS
[]
CSRF_USE_SESSIONS
False
DATABASES

DATABASE_ROUTERS
[]
DATA_UPLOAD_MAX_MEMORY_SIZE
2621440
DATA_UPLOAD_MAX_NUMBER_FIELDS
1000
DATA_UPLOAD_MAX_NUMBER_FILES
100
DATETIME_FORMAT
'N j, Y, P'
DATETIME_INPUT_FORMATS

DATE_FORMAT
'N j, Y'
DATE_INPUT_FORMATS

DEBUG
True
DEBUG_PROPAGATE_EXCEPTIONS
False
DECIMAL_SEPARATOR
'.'
DEFAULT_AUTO_FIELD
'django.db.models.AutoField'
DEFAULT_CHARSET
'utf-8'
DEFAULT_EXCEPTION_REPORTER
'django.views.debug.ExceptionReporter'
DEFAULT_EXCEPTION_REPORTER_FILTER
'django.views.debug.SafeExceptionReporterFilter'
DEFAULT_FILE_STORAGE
'django.core.files.storage.FileSystemStorage'
DEFAULT_FROM_EMAIL
'webmaster@localhost'
DEFAULT_INDEX_TABLESPACE
''
DEFAULT_TABLESPACE
''
DISALLOWED_USER_AGENTS
[]
EMAIL_BACKEND
'django.core.mail.backends.smtp.EmailBackend'
EMAIL_HOST
'localhost'
EMAIL_HOST_PASSWORD
'********************'
EMAIL_HOST_USER
''
EMAIL_PORT
25
EMAIL_SSL_CERTFILE
None
EMAIL_SSL_KEYFILE
'********************'
EMAIL_SUBJECT_PREFIX
'[Django] '
EMAIL_TIMEOUT
None
EMAIL_USE_LOCALTIME
False
EMAIL_USE_SSL
False
EMAIL_USE_TLS
False
FILE_UPLOAD_DIRECTORY_PERMISSIONS
None
FILE_UPLOAD_HANDLERS
['django.core.files.uploadhandler.MemoryFileUploadHandler', 'django.core.files.uploadhandler.TemporaryFileUploadHandler']
FILE_UPLOAD_MAX_MEMORY_SIZE
2621440
FILE_UPLOAD_PERMISSIONS
420
FILE_UPLOAD_TEMP_DIR
None
FIRST_DAY_OF_WEEK
0
FIXTURE_DIRS
[]
FORCE_SCRIPT_NAME
None
FORMAT_MODULE_PATH
None
FORM_RENDERER
'django.forms.renderers.DjangoTemplates'
IGNORABLE_404_URLS
[]
INSTALLED_APPS

INTERNAL_IPS
[]
LANGUAGES

LANGUAGES_BIDI

LANGUAGE_CODE
'en-us'
LANGUAGE_COOKIE_AGE
None
LANGUAGE_COOKIE_DOMAIN
None
LANGUAGE_COOKIE_HTTPONLY
False
LANGUAGE_COOKIE_NAME
'django_language'
LANGUAGE_COOKIE_PATH
'/'
LANGUAGE_COOKIE_SAMESITE
None
LANGUAGE_COOKIE_SECURE
False
LOCALE_PATHS
[]
LOGGING
{}
LOGGING_CONFIG
'logging.config.dictConfig'
LOGIN_REDIRECT_URL
'/accounts/profile/'
LOGIN_URL
'/accounts/login/'
LOGOUT_REDIRECT_URL
None
MANAGERS
[]
MEDIA_ROOT
''
MEDIA_URL
'/'
MESSAGE_STORAGE
'django.contrib.messages.storage.fallback.FallbackStorage'
MIDDLEWARE

MIGRATION_MODULES
{}
MONTH_DAY_FORMAT
'F j'
NUMBER_GROUPING
0
PASSWORD_HASHERS
'********************'
PASSWORD_RESET_TIMEOUT
'********************'
PREPEND_WWW
False
ROOT_URLCONF
'pet_memorial.urls'
SECRET_KEY
'********************'
SECRET_KEY_FALLBACKS
'********************'
SECURE_CONTENT_TYPE_NOSNIFF
True
SECURE_CROSS_ORIGIN_OPENER_POLICY
'same-origin'
SECURE_HSTS_INCLUDE_SUBDOMAINS
False
SECURE_HSTS_PRELOAD
False
SECURE_HSTS_SECONDS
0
SECURE_PROXY_SSL_HEADER
None
SECURE_REDIRECT_EXEMPT
[]
SECURE_REFERRER_POLICY
'same-origin'
SECURE_SSL_HOST
None
SECURE_SSL_REDIRECT
False
SERVER_EMAIL
'root@localhost'
SESSION_CACHE_ALIAS
'default'
SESSION_COOKIE_AGE
1209600
SESSION_COOKIE_DOMAIN
None
SESSION_COOKIE_HTTPONLY
True
SESSION_COOKIE_NAME
'sessionid'
SESSION_COOKIE_PATH
'/'
SESSION_COOKIE_SAMESITE
'Lax'
SESSION_COOKIE_SECURE
False
SESSION_ENGINE
'django.contrib.sessions.backends.db'
SESSION_EXPIRE_AT_BROWSER_CLOSE
False
SESSION_FILE_PATH
None
SESSION_SAVE_EVERY_REQUEST
False
SESSION_SERIALIZER
'django.contrib.sessions.serializers.JSONSerializer'
SETTINGS_MODULE
'pet_memorial.settings'
SHORT_DATETIME_FORMAT
'm/d/Y P'
SHORT_DATE_FORMAT
'm/d/Y'
SIGNING_BACKEND
'django.core.signing.TimestampSigner'
SILENCED_SYSTEM_CHECKS
[]
STATICFILES_DIRS
[]
STATICFILES_FINDERS
['django.contrib.staticfiles.finders.FileSystemFinder', 'django.contrib.staticfiles.finders.AppDirectoriesFinder']
STATICFILES_STORAGE
'django.contrib.staticfiles.storage.StaticFilesStorage'
STATIC_ROOT
None
STATIC_URL
'/static/'
TEMPLATES

TEMPLATE_APP_DIR

TEMPLATE_PROJECT_DIR

TEST_NON_SERIALIZED_APPS
[]
TEST_RUNNER
'django.test.runner.DiscoverRunner'
THOUSAND_SEPARATOR
','
TIME_FORMAT
'P'
TIME_INPUT_FORMATS

TIME_ZONE
'UTC'
USE_DEPRECATED_PYTZ
False
USE_I18N
True
USE_L10N
True
USE_THOUSAND_SEPARATOR
False
USE_TZ
True
USE_X_FORWARDED_HOST
False
USE_X_FORWARDED_PORT
False
WSGI_APPLICATION
'pet_memorial.wsgi.application'
X_FRAME_OPTIONS
'DENY'
YEAR_MONTH_FORMAT
'F Y'

Key information in error:

Reverse for 'owner_profile' with keyword arguments '{'slug': ''}' not found. 1 pattern(s) tried: ['owner/(?P<slug>[-a-zA-Z0-9_]+)/\\Z']
Exception Location:

C:\Users\starr\Code\pet_memorial\.venv\Lib\site-packages\django\urls\resolvers.py, line 828, in _reverse_with_prefix

Raised during:
pet_memorial.views.HomeView

So at least it seems A) that I am passing in as slug= correctly, it recogniazes "keyword arguments '{'slug: ''}'.

However, I now see that it is rendering from the home view, not the pet owner profile view.

Now that question is: I don't know how to send the owner slug specifically information into home view context.

And I think

def get_context_data(self,*args, **kwargs):

        context = super(Intro, self).get_context_data(*args,**kwargs)

        context['users'] = YourModel.objects.all()

        return context

get_context_data is the answer. I've done this once before but apparently I didn't remember or write it down and deleted my files.

 this is from https://www.geeksforgeeks.org/how-to-pass-additional-context-into-a-class-based-view-django/.

So my code for the HOME view (NOT pet owner detail view) is now

from django.views.generic import TemplateView

from pet_profile.models import PetOwner

class HomeView(TemplateView):

    template_name = "home.html"

    def get_context_data(self, *args, **kwargs):

        context['pet_owner'] = PetOwner.objects.all()

        return context

but I am now getting an error that context is not defined. Seems the framework doesn't want to let go, and insists on breakin gat all costs!

This reference

https://stackoverflow.com/questions/60156251/get-context-data-method-django

recommends a circular reference of assigning context to get_context_data, inside of get_context_data. Bad idea. Won't even try it.

Or maybe not. I guess pairing it with super. fixes it.

https://stackoverflow.com/questions/60156251/get-context-data-method-django

context = super().get_context_data(**kwargs)

I'm still not sure how super works, despite reading the documentation. It's too esoteric for me to understand. But that's for another day.

Once again NoReverseMatch at /home/ Reverse for 'owner_profile' with keyword arguments '{'slug': ''}' not found. 1 pattern(s) tried: ['owner/(?P<slug>[-a-zA-Z0-9_]+)/\\Z'].

Does it need to be in quotes? Why am i guessing? Why doesn't the documentation delineate all this? Frustrating.

Wiht quotes:

NoReverseMatch at /home/ Reverse for 'owner_profile' with keyword arguments '{'slug': 'pet_owner.slug'}' not found. 1 pattern(s) tried: ['owner/(?P<slug>[-a-zA-Z0-9_]+)/\\Z']

At least it recognizes the parameter now. Sort of. It doesn't find it though. I don't know why. I expressed it in the home view's context dictionary, so it should be found!

And that's as far as I've gotten. I don't know what else to do. The google searches are starting to require semantic understanding, and google doesn't do that. I think a limit has been reached.

Michael

[Michael Starr]

{% extends "base.html" %}

{% block header %}

   

{% endblock %}

{% block content %}

    <a href="{% url 'owner_profile' slug=pet_owner %}">test</a>

{% endblock %}

yields progress with

NoReverseMatch at /home/ Reverse for 'owner_profile' with keyword arguments '{'slug': <QuerySet [<PetOwner: Jasper Morello>]>}' not found. 1 pattern(s) tried: ['owner/(?P<slug>[-a-zA-Z0-9_]+)/\\Z']
Request Method:
GET
Request URL:
http://127.0.0.1:8000/home/
Django Version:
4.1.7
Exception Type:
NoReverseMatch
Exception Value:
Reverse for 'owner_profile' with keyword arguments '{'slug': <QuerySet [<PetOwner: Jasper Morello>]>}' not found. 1 pattern(s) tried: ['owner/(?P<slug>[-a-zA-Z0-9_]+)/\\Z']
Exception Location:

C:\Users\starr\Code\pet_memorial\.venv\Lib\site-packages\django\urls\resolvers.py, line 828, in _reverse_with_prefix

Raised during:
pet_memorial.views.HomeView
Python Executable:

C:\Users\starr\Code\pet_memorial\.venv\Scripts\python.exe

Python Version:
3.11.2
Python Path:

['C:\\Users\\starr\\Code\\pet_memorial', 'C:\\Program Files\\Python311\\python311.zip', 'C:\\Program Files\\Python311\\DLLs', 'C:\\Program Files\\Python311\\Lib', 'C:\\Program Files\\Python311', 'C:\\Users\\starr\\Code\\pet_memorial\\.venv', 'C:\\Users\\starr\\Code\\pet_memorial\\.venv\\Lib\\site-packages']

Server time:
Tue, 28 Feb 2023 23:45:05 +0000

this is better because it indicates that the context dictionary does understand the PetOwner object (I have a pet owner named "Jasper Morello").

Try the name parameter:

NoReverseMatch at /home/ Reverse for 'owner_profile' with keyword arguments '{'slug': ''}' not found. 1 pattern(s) tried: ['owner/(?P<slug>[-a-zA-Z0-9_]+)/\\Z']

So the bug seems to be that any parameter of the context dictionary object (the object being recognized), the parameters can not be referenced, and/or I am using improper syntax to reference them. I don't know what else to do.

TemplateSyntaxError at /home/ Could not parse the remainder: '[name]' from 'pet_owner[name]'

for

{% extends "base.html" %}

{% block header %}

   

{% endblock %}

{% block content %}

    <a href="{% url 'owner_profile' slug=pet_owner[name] %}">test</a>

{% endblock %}

So I guess, if anyone knows how to reference context dictionary parameters (sub-objects) in a View from the template, let me know. I'll keep digging.

Michael

[Michael Starr]

To clarify,

<a href="{% url '<url name>' <parameter, such as slug>=<view context object name>.<context object parameter> %}">blah blah</a>

does not work. And I don't know why.

.<context object parameter>

is not recognized, to be specific.

Michael

[Michael Starr]

According to this https://stackoverflow.com/questions/44891060/how-to-pass-context-objects-as-django-url-template-tag-arguments

I am not doing anything wrong. But it doesn't work.

I would browse through the docs, I think I will, but for now I am tired of the bs from the framework that is for perfectionists with deadlines.

More like for perfectionists who like agonizing over unspecified errors ad nauseum.

Michael

[Michael Starr]

Good relevant reading: https://stackoverflow.com/questions/20957388/what-is-a-context-in-django

https://stackoverflow.com/questions/63782504/how-to-send-dictionary-context-data-to-view-from-template-in-django

https://stackoverflow.com/questions/47273297/python-understanding-dictionary-view-objects

I will go over these etc.

Michael

[Michael Starr]

I just now realized I am returning a list of pet owners, not one pet owner, and as such no parameter will be valid. I have to either loop through the list, or filter it in the view.

Will update on results.

Michael

[Michael Starr]

Yeah it works now.

Here's the final code:

(or some of it anyway)

home.html

{% extends "base.html" %}

{% block header %}

   

{% endblock %}

{% block content %}

    {% for pet_owner in pet_owners %}

        <a href="{% url 'owner_profile' slug=pet_owner.slug %}">test</a>

    {% endfor %}

{% endblock %}

views.py

from django.views.generic import TemplateView

from pet_profile.models import PetOwner

class HomeView(TemplateView):

    template_name = "home.html"

    def get_context_data(self, *args, **kwargs):

        context = super().get_context_data(**kwargs)

        context['pet_owners'] = PetOwner.objects.all()

        return context

Thanks for being a landing place to hash out my issues. Looking forward to help from others when needed next time.

Michael

[Michael Starr]

pet_owner.profile.html template

{% extends "base.html" %}

{% block header %}

{% endblock %}

{% block content %}

    {{ owner.name }}

    {{ owner.age }}

    {{ owner.location }}

    {{ owner.profile_photo }}

    {% for pet in owner.pets.all %}

        {{ pet.name }}

        {{ pet.animaltype }}

        {{ pet.age }}

        {{ pet.profile_photo }}

    {% endfor %}

{% endblock %}

[Michael Starr]

And I do apologize for hating on the django docs. The Index at the docs is super useful.

Michael