[BUG] placeholders-outside-cms TemplateDoesNotExist

[openHBP]

Description

https://docs.django-cms.org/en/latest/how_to/01-placeholders.html#placeholders-outside-cms

Following the steps described "structure mode template" does not work.
Django does not find the template in any places: root templates folder, myapp/templates, myapp/templates/myapp

django.template.exceptions.TemplateDoesNotExist

Additional information (CMS/Python/Django versions)

• Django==3.2.25
• django-cms==4.1.0
• Python==3.10

Do you want to help fix this issue?

• Yes, I want to help fix this issue and I will join #workgroup-pr-review on Slack to confirm with the community that a PR is welcome.
• No, I only want to report the issue.

[fsbraun]

Hi @openHBP ! Can you double-check your get_template() result and the template folders? I cannot reproduce this.

If get_template() returns "my_app/my_model_structure.html" the typical place for the template would be my_app/templates/my_app/my_model_structure.html.

[openHBP]

The template is indeed in my_app/templates/my_app/my_model_structure.html where my_app is msg

Content of msg.models.py

from cms.models.fields import PlaceholderRelationField
from cms.utils.placeholder import get_placeholder_from_slot

...
short_text3 = PlaceholderRelationField()
...

    def my_placeholder(self):
        return get_placeholder_from_slot(self.short_text3, "msgdet_slot")

    def get_template(self):
        return "msg/msgdet_model_structure.html"

Apart from that everything works fine. I can edit the placeholder text as if it was in the CMS

Here is the error (where /chapeau is the /admin path)

File "/home/pat/dev/pipenv/cpilote2/.venv/lib/python3.10/site-packages/django/template/base.py", line 938, in render
    bit = node.render_annotated(context)
  File "/home/pat/dev/pipenv/cpilote2/.venv/lib/python3.10/site-packages/django/template/base.py", line 905, in render_annotated
    return self.render(context)
  File "/home/pat/dev/pipenv/cpilote2/.venv/lib/python3.10/site-packages/django/template/library.py", line 192, in render
    output = self.func(*resolved_args, **resolved_kwargs)
  File "/home/pat/dev/pipenv/cpilote2/.venv/lib/python3.10/site-packages/cms/templatetags/cms_js_tags.py", line 36, in render_cms_structure_js
    obj_placeholders_by_slot = rescan_placeholders_for_obj(obj)
  File "/home/pat/dev/pipenv/cpilote2/.venv/lib/python3.10/site-packages/cms/utils/placeholder.py", line 352, in rescan_placeholders_for_obj
    declared_placeholders = get_declared_placeholders_for_obj(obj)
  File "/home/pat/dev/pipenv/cpilote2/.venv/lib/python3.10/site-packages/cms/utils/placeholder.py", line 374, in get_declared_placeholders_for_obj
    return get_placeholders(obj.get_template())
  File "/home/pat/dev/pipenv/cpilote2/.venv/lib/python3.10/site-packages/cms/utils/placeholder.py", line 252, in get_placeholders
    compiled_template = get_template(template)
  File "/home/pat/dev/pipenv/cpilote2/.venv/lib/python3.10/site-packages/django/template/loader.py", line 19, in get_template
    raise TemplateDoesNotExist(template_name, chain=chain)
django.template.exceptions.TemplateDoesNotExist: /msg/msgdet_model_structure.html

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/home/pat/dev/pipenv/cpilote2/.venv/lib/python3.10/site-packages/django/core/handlers/exception.py", line 47, in inner
    response = get_response(request)
  File "/home/pat/dev/pipenv/cpilote2/.venv/lib/python3.10/site-packages/django/core/handlers/base.py", line 181, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/home/pat/dev/pipenv/cpilote2/.venv/lib/python3.10/site-packages/django/utils/decorators.py", line 130, in _wrapped_view
    response = view_func(request, *args, **kwargs)
  File "/home/pat/dev/pipenv/cpilote2/.venv/lib/python3.10/site-packages/django/views/decorators/cache.py", line 44, in _wrapped_view_func
    response = view_func(request, *args, **kwargs)
  File "/home/pat/dev/pipenv/cpilote2/.venv/lib/python3.10/site-packages/django/contrib/admin/sites.py", line 232, in inner
    return view(request, *args, **kwargs)
  File "/home/pat/dev/pipenv/cpilote2/.venv/lib/python3.10/site-packages/cms/views.py", line 263, in render_object_structure
    return render(request, 'cms/toolbar/structure.html', context)
  File "/home/pat/dev/pipenv/cpilote2/.venv/lib/python3.10/site-packages/django/shortcuts.py", line 19, in render
    content = loader.render_to_string(template_name, context, request, using=using)
  File "/home/pat/dev/pipenv/cpilote2/.venv/lib/python3.10/site-packages/django/template/loader.py", line 62, in render_to_string
    return template.render(context, request)
  File "/home/pat/dev/pipenv/cpilote2/.venv/lib/python3.10/site-packages/django/template/backends/django.py", line 63, in render
    reraise(exc, self.backend)
  File "/home/pat/dev/pipenv/cpilote2/.venv/lib/python3.10/site-packages/django/template/backends/django.py", line 84, in reraise
    raise new from exc
django.template.exceptions.TemplateDoesNotExist: /msg/msgdet_model_structure.html
[29/Apr/2024 12:13:56] "GET /chapeau/cms/placeholder/object/53/structure/1271/ HTTP/1.1" 500 260510

[fsbraun]

When does the error happen? I would assume that the structure view is necessary to edit the content. So if that works, the template should be found. Maybe it is accessed elsewhere, too?