Advanced Tutorial (how to write reusable app), last step does not work

[Cate Liu]

I am a new newbie to Django.  Great tutorial BTW.  I followed it to the T and 99.9% worked.
Except the last step in the Advanced tutorial, the step 3 in 'Using your own package'.
I could see http://127.0.0.1:8000/admin/ and create polls without any problem.
But http://127.0.0.1:8000/polls/ would give me the following error.

I see there are two problems.
1. /Users/nnn/django_exercises/mysite/templates/polls/index.html is the wrong location, it should be $$/django_polls/polls/templates/polls/index.html.
2. What is polls/poll_list.html?  Nowhere in the tutorial ever created this file, no?

Thanks for any advice.


----------------------------------------------------------------------------------------------------------

TemplateDoesNotExist at /polls/

polls/index.html, polls/poll_list.html

Request Method:	GET
Request URL:	http://127.0.0.1:8000/polls/
Django Version:	1.5.1
Exception Type:	TemplateDoesNotExist
Exception Value:	polls/index.html, polls/poll_list.html
Exception Location:	/Library/Python/2.7/site-packages/django/template/loader.py in select_template, line 194
Python Executable:	/usr/bin/python
Python Version:	2.7.2
Python Path:	['/Users/nnn/django_exercises/mysite', '/Users/nnn/py_pkg/lib/python/django_polls-0.1-py2.7.egg', '/Users/nnn/py_pkg/lib/python', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python27.zip', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-darwin', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac/lib-scriptpackages', '/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-tk', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-old', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-dynload', '/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/PyObjC', '/Library/Python/2.7/site-packages']
Server time:	Fri, 26 Jul 2013 16:59:14 -0700

Template-loader postmortem

Django tried loading these templates, in this order:

• Using loader django.template.loaders.filesystem.Loader:
  • /Users/nnn/django_exercises/mysite/templates/polls/index.html, polls/poll_list.html (File does not exist)
• Using loader django.template.loaders.app_directories.Loader:
  • /Library/Python/2.7/site-packages/django/contrib/auth/templates/polls/index.html, polls/poll_list.html (File does not exist)
  • /Library/Python/2.7/site-packages/django/contrib/admin/templates/polls/index.html, polls/poll_list.html (File does not exist)

[Mike Dewhirst]

On 27/07/2013 10:20am, Cate Liu wrote:
>
> I am a new newbie to Django. Great tutorial BTW. I followed it to the
> T and 99.9% worked.
> Except the last step in the Advanced tutorial, the step 3 in 'Using your
> own package'.
> I could see http://127.0.0.1:8000/admin/ and create polls without any
> problem.
> But http://127.0.0.1:8000/polls/ would give me the following error.
>
> I see there are two problems.
> 1. |/Users/nnn/django_exercises/mysite/templates/polls/index.html is the
> wrong location, it should be
> $$/django_polls/polls/templates/polls/index.html.
> 2. What is ||polls/poll_list.html?| Nowhere in the tutorial ever
> created this file, no?

I don't know the tutorial and haven't looked through it but you have
definitely called for poll_list.html somewhere in your code.

The first place to look is in your urls.py. Try and see how the URL you
entered is being interpreted. It is probably calling a view (in
views.py?) which names poll_list.html directly.

I put print statements in my settings.py if DEBUG == True which show my
static, media and template locations every time I use manage.py
runserver. It is very helpful when debugging file locations.

You might also try http://127.0.0.1:8000/admin/polls/

> * Using loader |django.template.loaders.filesystem.Loader|:
> o |/Users/nnn/django_exercises/mysite/templates/polls/index.html,

> polls/poll_list.html| (File does not exist)

> * Using loader |django.template.loaders.app_directories.Loader|:
> o |/Library/Python/2.7/site-packages/django/contrib/auth/templates/polls/index.html,

> polls/poll_list.html| (File does not exist)

> o |/Library/Python/2.7/site-packages/django/contrib/admin/templates/polls/index.html,

> polls/poll_list.html| (File does not exist)
>
>

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[Christian Erhardt]

Django is using a coding "style" called covention over configuration. That means that you don't have to configure every bit of your application instead a convention is used to determine where you have to place stuff so django finds and uses it. For the beginner it seems like django is using some sort of magic to connect erlverything together.
In your case, having read the tutorial a long time ago, you surely created a View class that is derived from the ListView base class. The convention here is that you create a template called <modelnqme>_list.html. If you have a file with this name, the listview will use it for rendering. It seems the creation of this file is missing in the tutorial. But it is pretty straight forward if you look at the documentation of the listview base class.

[asherakhet06]

Hello.  I'm a rookie as well and I'm having exactly this same issue.  Trying to figure out what to do, but haven't been successful unfortunately.  Based on what I read (convention over configuration),  I understand that I should to make a poll_list.html file and store this in templates, to get my site to work.  Or should I just change the name of my index.html file in templates?  Am I missing something here? Thanks a lot guys.        

[Robin Lery]

In order to create a reusable app, you have to create a new 'templates' folder in your app and place the the absolute path in the templates directory in your settings.py. And then create the html files as concerned with your app in the templates directory you created within the app.

Robin

[Sebastian Wade]

hi,guys

  u should read this content: 

https://docs.djangoproject.com/en/1.0/intro/tutorial04/

We’re using two generic views here: object_list() and object_detail(). Respectively, those two views abstract the concepts of “display a list of objects” and “display a detail page for a particular type of object.”

• Each generic view needs to know what data it will be acting upon. This data is provided in a dictionary. The queryset key in this dictionary points to the list of objects to be manipulated by the generic view.
• The object_detail() generic view expects the ID value captured from the URL to be called "object_id", so we’ve changed poll_id to object_id for the generic views.
• We’ve added a name, poll_results, to the results view so that we have a way to refer to its URL later on (see the documentation about naming URL patterns for information). We’re also using the url() function fromdjango.conf.urls.defaults here. It’s a good habit to use url() when you are providing a pattern name like this.

By default, the object_detail() generic view uses a template called <app name>/<model name>_detail.html. In our case, it’ll use the template "polls/poll_detail.html". Thus, rename your polls/detail.html template to polls/poll_detail.html, and change the render_to_response() line in vote().

Similarly, the object_list() generic view uses a template called <app name>/<model name>_list.html. Thus, renamepolls/index.html to polls/poll_list.html.

Because we have more than one entry in the URLconf that uses object_detail() for the polls app, we manually specify a template name for the results view: template_name='polls/results.html'. Otherwise, both views would use the same template. Note that we use dict() to return an altered dictionary in place.

[Sebastian Wade]

hi, guys

hoped this may help you.

https://docs.djangoproject.com/en/1.0/intro/tutorial04/

We’re using two generic views here: object_list() and object_detail(). Respectively, those two views abstract the concepts of “display a list of objects” and “display a detail page for a particular type of object.”

• Each generic view needs to know what data it will be acting upon. This data is provided in a dictionary. The queryset key in this dictionary points to the list of objects to be manipulated by the generic view.
• The object_detail() generic view expects the ID value captured from the URL to be called "object_id", so we’ve changed poll_id to object_id for the generic views.
• We’ve added a name, poll_results, to the results view so that we have a way to refer to its URL later on (see the documentation about naming URL patterns for information). We’re also using the url() function fromdjango.conf.urls.defaults here. It’s a good habit to use url() when you are providing a pattern name like this.

By default, the object_detail() generic view uses a template called <app name>/<model name>_detail.html. In our case, it’ll use the template "polls/poll_detail.html". Thus, rename your polls/detail.html template to polls/poll_detail.html, and change the render_to_response() line in vote().

Similarly, the object_list() generic view uses a template called <app name>/<model name>_list.html. Thus, renamepolls/index.html to polls/poll_list.html.

Because we have more than one entry in the URLconf that uses object_detail() for the polls app, we manually specify a template name for the results view: template_name='polls/results.html'. Otherwise, both views would use the same template. Note that we use dict() to return an altered dictionary in place.

On Saturday, July 27, 2013 8:20:26 AM UTC+8, Cate Liu wrote:

[Raj]

Faced the same problem with the Django 1.6 tutorial... circumvented it by renaming "index.html" to "poll_list.html".

Read on if you want to know more about this issue...

It seems there is a problem with the template loader, or the specification of which template to load for the generic.ListView.

The generic.DetailView seems to find polls/detail.html and polls.results.html templates easily enough.

However, IndexView cannot find polls/index.html.

This is not a template folder specification problem, as all these files are in the same folder..

Also, Django specifically says in its error message /home/user/website/myweb/polls/templates/polls/index.html, polls/poll_list.html (File does not exist)

I don't understand what it means... is it looking for either of the files "index.html" (this file exists and is at the correct location) or "poll_list.html", or the weirder file "index.html, polls/poll_list.html". In the latter case, "index.html, polls" is a directory with a ", " in its name.

Template-loader postmortem

Django tried loading these templates, in this order:

• Using loader django.template.loaders.filesystem.Loader:
  • /home/user/website/myweb/templates/polls/index.html, polls/poll_list.html (File does not exist)
• Using loader django.template.loaders.app_directories.Loader:
  • /usr/local/lib/python2.7/dist-packages/django/contrib/admin/templates/polls/index.html, polls/poll_list.html (File does not exist)
  • /usr/local/lib/python2.7/dist-packages/django/contrib/auth/templates/polls/index.html, polls/poll_list.html (File does not exist)
  • /home/user/website/myweb/polls/templates/polls/index.html, polls/poll_list.html (File does not exist)

I tried a fun experiment... created a directory called "index.html, polls" under polls/templates/polls and added a file called poll_list.html. On refresh, the error message is

• /home/user/website/myweb/polls/templates/polls/index.html, polls/poll_list.html (File exists)

The theory is correct... Django generic.ListView is looking into a weird folder with ", " in its name.

Hopefully, this helps to track the problem.

[Gus Gutoski]

Try restarting the web server after installing your new polls package.

I was stuck on this problem for a bit.  You probably don't care anymore since this thread is over a year old.  But I thought it might be useful to others.

[Dennis Kao]

Hi 

I just face this same issue and stuck in it for few days, than find out the TEMPLATE_LOADERS setting,

by default it has two way to find templates:

'django.template.loaders.filesystem.Loader',
'django.template.loaders.app_directories.Loader'

but the 

'django.template.loaders.eggs.Loader',

is disable by default,

so, just add these codes to setting.py

TEMPLATE_LOADERS = (

    'django.template.loaders.filesystem.Loader',

    'django.template.loaders.app_directories.Loader',

    'django.template.loaders.eggs.Loader'

)

than it works fine :)