'WSGIRequest' object has no attribute 'dpd_content_handler'

[brylie]

I set up a working template with the plotly_app template tag, and the SimpleExample Dash app rendered. However, when I change plotly_app to plotly_direct, I get the following error:

'WSGIRequest' object has no attribute 'dpd_content_handler'

What is missing from the SimpleExample app that would provide the dpd_content_handler?

[brylie]

Traceback

Environment:


Request Method: GET
Request URL: http://127.0.0.1:8000/dashboard/example

Django Version: 2.1.3
Python Version: 3.6.7
Installed Applications:
['django.contrib.admin',
 'django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.messages',
 'django.contrib.staticfiles',
 'django_plotly_dash.apps.DjangoPlotlyDashConfig']
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/brylie/code/Python/django/django_dash_test/templates/example.html, error at line 3
   'WSGIRequest' object has no attribute 'dpd_content_handler'
   1 : {%load plotly_dash%}
   2 : 
   3 :  {% plotly_direct name="SimpleExample"%} 

Traceback:

File "/home/brylie/.local/share/virtualenvs/django_dash_test-BZBwNn38/lib/python3.6/site-packages/django/core/handlers/exception.py" in inner
  34.             response = get_response(request)

File "/home/brylie/.local/share/virtualenvs/django_dash_test-BZBwNn38/lib/python3.6/site-packages/django/core/handlers/base.py" in _get_response
  126.                 response = self.process_exception_by_middleware(e, request)

File "/home/brylie/.local/share/virtualenvs/django_dash_test-BZBwNn38/lib/python3.6/site-packages/django/core/handlers/base.py" in _get_response
  124.                 response = wrapped_callback(request, *callback_args, **callback_kwargs)

File "/home/brylie/code/Python/django/django_dash_test/dashboard_test/views.py" in example
  22.     return render(request, template_name=template_name, context=context)

File "/home/brylie/.local/share/virtualenvs/django_dash_test-BZBwNn38/lib/python3.6/site-packages/django/shortcuts.py" in render
  36.     content = loader.render_to_string(template_name, context, request, using=using)

File "/home/brylie/.local/share/virtualenvs/django_dash_test-BZBwNn38/lib/python3.6/site-packages/django/template/loader.py" in render_to_string
  62.     return template.render(context, request)

File "/home/brylie/.local/share/virtualenvs/django_dash_test-BZBwNn38/lib/python3.6/site-packages/django/template/backends/django.py" in render
  61.             return self.template.render(context)

File "/home/brylie/.local/share/virtualenvs/django_dash_test-BZBwNn38/lib/python3.6/site-packages/django/template/base.py" in render
  171.                     return self._render(context)

File "/home/brylie/.local/share/virtualenvs/django_dash_test-BZBwNn38/lib/python3.6/site-packages/django/template/base.py" in _render
  163.         return self.nodelist.render(context)

File "/home/brylie/.local/share/virtualenvs/django_dash_test-BZBwNn38/lib/python3.6/site-packages/django/template/base.py" in render
  937.                 bit = node.render_annotated(context)

File "/home/brylie/.local/share/virtualenvs/django_dash_test-BZBwNn38/lib/python3.6/site-packages/django/template/base.py" in render_annotated
  904.             return self.render(context)

File "/home/brylie/.local/share/virtualenvs/django_dash_test-BZBwNn38/lib/python3.6/site-packages/django/template/library.py" in render
  214.         _dict = self.func(*resolved_args, **resolved_kwargs)

File "/home/brylie/.local/share/virtualenvs/django_dash_test-BZBwNn38/lib/python3.6/site-packages/django_plotly_dash/templatetags/plotly_dash.py" in plotly_direct
  108.     eh = context.request.dpd_content_handler.embedded_holder

Exception Type: AttributeError at /dashboard/example
Exception Value: 'WSGIRequest' object has no attribute 'dpd_content_handler'

[brylie]

I changed my dashboard template to the following, but still get the error. Only now, the error points to the line with {% load plotly_dash %}.

<!DOCTYPE html>
<html>
    {%load plotly_dash%}
    <head>
        {% plotly_header %}
    </head>


    <body>
        {% plotly_direct name="SimpleExample"%}
    </body>


    {% plotly_footer %}
</html>

Traceback

Environment:


Request Method: GET
Request URL: http://127.0.0.1:8000/dashboard/example

Django Version: 2.1.3
Python Version: 3.6.7
Installed Applications:
['django.contrib.admin',
 'django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.messages',
 'django.contrib.staticfiles',
 'django_plotly_dash.apps.DjangoPlotlyDashConfig']
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/brylie/code/Python/django/django_dash_test/templates/example.html, error at line 5
   'WSGIRequest' object has no attribute 'dpd_content_handler'
   1 : <!DOCTYPE html>
   2 : <html>
   3 :     {%load plotly_dash%}
   4 :     <head>
   5 :          {% plotly_header %} 
   6 :     </head>
   7 : 
   8 : 
   9 :     <body>
   10 :         {% plotly_direct name="SimpleExample"%}
   11 :     </body>
   12 : 
   13 : 
   14 :     {% plotly_footer %}
   15 : </html>

Traceback:

File "/home/brylie/.local/share/virtualenvs/django_dash_test-BZBwNn38/lib/python3.6/site-packages/django/core/handlers/exception.py" in inner
  34.             response = get_response(request)

File "/home/brylie/.local/share/virtualenvs/django_dash_test-BZBwNn38/lib/python3.6/site-packages/django/core/handlers/base.py" in _get_response
  126.                 response = self.process_exception_by_middleware(e, request)

File "/home/brylie/.local/share/virtualenvs/django_dash_test-BZBwNn38/lib/python3.6/site-packages/django/core/handlers/base.py" in _get_response
  124.                 response = wrapped_callback(request, *callback_args, **callback_kwargs)

File "/home/brylie/code/Python/django/django_dash_test/dashboard_test/views.py" in example
  22.     return render(request, template_name=template_name, context=context)

File "/home/brylie/.local/share/virtualenvs/django_dash_test-BZBwNn38/lib/python3.6/site-packages/django/shortcuts.py" in render
  36.     content = loader.render_to_string(template_name, context, request, using=using)

File "/home/brylie/.local/share/virtualenvs/django_dash_test-BZBwNn38/lib/python3.6/site-packages/django/template/loader.py" in render_to_string
  62.     return template.render(context, request)

File "/home/brylie/.local/share/virtualenvs/django_dash_test-BZBwNn38/lib/python3.6/site-packages/django/template/backends/django.py" in render
  61.             return self.template.render(context)

File "/home/brylie/.local/share/virtualenvs/django_dash_test-BZBwNn38/lib/python3.6/site-packages/django/template/base.py" in render
  171.                     return self._render(context)

File "/home/brylie/.local/share/virtualenvs/django_dash_test-BZBwNn38/lib/python3.6/site-packages/django/template/base.py" in _render
  163.         return self.nodelist.render(context)

File "/home/brylie/.local/share/virtualenvs/django_dash_test-BZBwNn38/lib/python3.6/site-packages/django/template/base.py" in render
  937.                 bit = node.render_annotated(context)

File "/home/brylie/.local/share/virtualenvs/django_dash_test-BZBwNn38/lib/python3.6/site-packages/django/template/base.py" in render_annotated
  904.             return self.render(context)

File "/home/brylie/.local/share/virtualenvs/django_dash_test-BZBwNn38/lib/python3.6/site-packages/django/template/library.py" in render
  192.         output = self.func(*resolved_args, **resolved_kwargs)

File "/home/brylie/.local/share/virtualenvs/django_dash_test-BZBwNn38/lib/python3.6/site-packages/django_plotly_dash/templatetags/plotly_dash.py" in plotly_header
  92.     return context.request.dpd_content_handler.header_placeholder

Exception Type: AttributeError at /dashboard/example
Exception Value: 'WSGIRequest' object has no attribute 'dpd_content_handler'

[delsim]

Do you have the middleware installed? It looks like the documentation forplotly_direct tells you to use the plotly_header and plotly_footer tags but doesn't also mention the need to add the middleware.

[brylie]

Ok, I will double check the middleware ASAP.

[delsim]

Sounds good. A new patch release - with updated documentation regarding the middleware - was pushed out this morning, so the RTD online docs should now be updated.

[brylie]

Yes, adding the middleware works! Thanks for clarifying the documentation @delsim

From my basic understanding, the plotly_direct approach to rendering feels a bit more secure than the iframe approach, as it would seem to adhere to django authorization code (such as a view decorator).

[GibbsConsulting]

I don't think that the use of an iframe will have any impact on security; with or without one the way Dash works is to repeatedly call the various URLs, notably dash-update-component. Issue #82 calls for more documentation which should help clarify this point.

[GibbsConsulting]

Issue #82 has been merged into master and released. Closing this issue as I think it has now been addressed; please reopen if not.