CODEWITHSUNDEEP
djangoplotly-dash
e2718281
e2718281

Reputation: 35

ValueError: server must be a Flask app or a boolean

I'm trying to work through the simplest dashboard example in the django-plotly-dash documentation, but I'm consistently getting the ValueError above.

For the code below, assume the django project name is django_project and the django app name is dashboard.

My ROOT_URLCONF at django_project/urls.py has the following relevant code:

import dashboard.dash_app
from dashboard.views import test_view

urlpatterns = [
    ...
    path('dashboard/', test_view, name='test_view'),
    path('django_plotly_dash/', include('django_plotly_dash.urls')),
]

My dashboard app view, located at dashboard/views.py is as follows:

from django.shortcuts import render

def test_view(request):
    return render(request, 'dashboard/main.html')

The main.html template is as follows:

from django.shortcuts import render

def test_view(request):
    return render(request, 'dashboard/main.html')

{% load plotly_dash %}

{% plotly_app name="SimpleExample" %}

Finally, the DjangoDash app instance is created in a file called dashboard/dash_app.py. As shown earlier, this module is imported in django_project/urls.py, as above. Code is as follows:

import dash
import dash_core_components as dcc
import dash_html_components as html

from django_plotly_dash import DjangoDash

app = DjangoDash('SimpleExample')

app.layout = ...

@app.callback(...)
def callback_color(...):
    ...

During the debugging process, the only other seemingly relevant information that I have is that the base_pathname is '/django_plotly_dash/app/SimpleExample/'

Any other ideas?

Upvotes: 0

Views: 941

Answers (2)

tabre
tabre

Reputation: 26

This is caused by the recent update to Dash version 1.0 on 2019-06-20. The Dash class now checks to ensure that server is either boolean or an instance of Flask. Since django plotly_dash uses it's own PseudoFlask object, it fails this check and it is incompatible with Dash 1.0 and will need to be updated for use with the current Dash version.

Upvotes: 1

Wessel Klijnsma
Wessel Klijnsma

Reputation: 68

I experienced the same problem today. Using an older version of Dash (0.43.0) solved it for me.

Upvotes: 1

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