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Python

Meicki Jeldal
Meicki Jeldal
1,446 Points
Posted by Meicki Jeldal
Meicki Jeldal
1,446 Points

Django list index out of range error

Im getting an error: list index out of range after trying going to my teams page and trying loading all the teams from the database but i then get the above error cannot see why its happening

Error file

Environment:


Request Method: GET
Request URL: http://chaos.jeldal.art/teams/2/

Django Version: 1.11.6
Python Version: 3.6.3
Installed Applications:
['django.contrib.admin',
 'django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.messages',
 'django.contrib.staticfiles',
 'staff']
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 /home/melonendk/webapps/victory_genki_dk/victory/staff/templates/base.html, error at line 0
   list index out of range   1 : {% load static %}
   2 : 
   3 : <!DOCTYPE html>
   4 : 
   5 : <html lang="en">
   6 :  <head>
   7 :      <meta charset="utf-8">
   8 :      <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
   9 :      <meta name="apple-mobile-web-app-capable" content="yes">
   10 :         <link href="{% static 'img/icons/apple-touch-icon.png' %}" rel="apple-touch-icon" />


Traceback:

File "/home/melonendk/webapps/victory_genki_dk/lib/python3.6/Django-1.11.6-py3.6.egg/django/template/base.py" in _resolve_lookup
  882.                     current = current[bit]

During handling of the above exception ('Team' object is not subscriptable), another exception occurred:

File "/home/melonendk/webapps/victory_genki_dk/lib/python3.6/Django-1.11.6-py3.6.egg/django/core/handlers/exception.py" in inner
  41.             response = get_response(request)

File "/home/melonendk/webapps/victory_genki_dk/lib/python3.6/Django-1.11.6-py3.6.egg/django/core/handlers/base.py" in _get_response
  187.                 response = self.process_exception_by_middleware(e, request)

File "/home/melonendk/webapps/victory_genki_dk/lib/python3.6/Django-1.11.6-py3.6.egg/django/core/handlers/base.py" in _get_response
  185.                 response = wrapped_callback(request, *callback_args, **callback_kwargs)

File "/home/melonendk/webapps/victory_genki_dk/victory/staff/views.py" in team
  217.  return render(request, 'team.html', context)

File "/home/melonendk/webapps/victory_genki_dk/lib/python3.6/Django-1.11.6-py3.6.egg/django/shortcuts.py" in render
  30.     content = loader.render_to_string(template_name, context, request, using=using)

File "/home/melonendk/webapps/victory_genki_dk/lib/python3.6/Django-1.11.6-py3.6.egg/django/template/loader.py" in render_to_string
  68.     return template.render(context, request)

File "/home/melonendk/webapps/victory_genki_dk/lib/python3.6/Django-1.11.6-py3.6.egg/django/template/backends/django.py" in render
  66.             return self.template.render(context)

File "/home/melonendk/webapps/victory_genki_dk/lib/python3.6/Django-1.11.6-py3.6.egg/django/template/base.py" in render
  207.                     return self._render(context)

File "/home/melonendk/webapps/victory_genki_dk/lib/python3.6/Django-1.11.6-py3.6.egg/django/template/base.py" in _render
  199.         return self.nodelist.render(context)

File "/home/melonendk/webapps/victory_genki_dk/lib/python3.6/Django-1.11.6-py3.6.egg/django/template/base.py" in render
  990.                 bit = node.render_annotated(context)

File "/home/melonendk/webapps/victory_genki_dk/lib/python3.6/Django-1.11.6-py3.6.egg/django/template/base.py" in render_annotated
  957.             return self.render(context)

File "/home/melonendk/webapps/victory_genki_dk/lib/python3.6/Django-1.11.6-py3.6.egg/django/template/loader_tags.py" in render
  177.             return compiled_parent._render(context)

File "/home/melonendk/webapps/victory_genki_dk/lib/python3.6/Django-1.11.6-py3.6.egg/django/template/base.py" in _render
  199.         return self.nodelist.render(context)

File "/home/melonendk/webapps/victory_genki_dk/lib/python3.6/Django-1.11.6-py3.6.egg/django/template/base.py" in render
  990.                 bit = node.render_annotated(context)

File "/home/melonendk/webapps/victory_genki_dk/lib/python3.6/Django-1.11.6-py3.6.egg/django/template/base.py" in render_annotated
  957.             return self.render(context)

File "/home/melonendk/webapps/victory_genki_dk/lib/python3.6/Django-1.11.6-py3.6.egg/django/template/loader_tags.py" in render
  72.                 result = block.nodelist.render(context)

File "/home/melonendk/webapps/victory_genki_dk/lib/python3.6/Django-1.11.6-py3.6.egg/django/template/base.py" in render
  990.                 bit = node.render_annotated(context)

File "/home/melonendk/webapps/victory_genki_dk/lib/python3.6/Django-1.11.6-py3.6.egg/django/template/base.py" in render_annotated
  957.             return self.render(context)

File "/home/melonendk/webapps/victory_genki_dk/lib/python3.6/Django-1.11.6-py3.6.egg/django/template/base.py" in render
  1040.             output = self.filter_expression.resolve(context)

File "/home/melonendk/webapps/victory_genki_dk/lib/python3.6/Django-1.11.6-py3.6.egg/django/template/base.py" in resolve
  708.                 obj = self.var.resolve(context)

File "/home/melonendk/webapps/victory_genki_dk/lib/python3.6/Django-1.11.6-py3.6.egg/django/template/base.py" in resolve
  849.             value = self._resolve_lookup(context)

File "/home/melonendk/webapps/victory_genki_dk/lib/python3.6/Django-1.11.6-py3.6.egg/django/template/base.py" in _resolve_lookup
  890.                         current = getattr(current, bit)

File "/home/melonendk/webapps/victory_genki_dk/victory/staff/models.py" in teamleaders_listable
  22.       string = leaders[0].extendeduser.nickname

File "/home/melonendk/webapps/victory_genki_dk/lib/python3.6/Django-1.11.6-py3.6.egg/django/db/models/query.py" in __getitem__
  289.         return list(qs)[0]

Exception Type: IndexError at /teams/2/
Exception Value: list index out of range
Chris Freeman
Chris Freeman
Treehouse Moderator 68,441 Points
Chris Freeman
Chris Freeman
Treehouse Moderator 68,441 Points

It difficult to debug without seeing the code. Looking at the stacktrace, the two lines of your code shown are:

File "/home/melonendk/webapps/victory_genki_dk/victory/staff/views.py" in team
  217.  return render(request, 'team.html', context)

File "/home/melonendk/webapps/victory_genki_dk/victory/staff/models.py" in teamleaders_listable
  22.       string = leaders[0].extendeduser.nickname

Since only the second line explicitly uses indexing, could it be possible that the leaders list is empty making the [0] index undefined?