Downloading dynamically generated files from a Dash/Flask app

Question

I tried to build a minimal example of a Dash app that illustrates the problem of dynamically generating a file that can then be downloaded via a download button.

If

Answer 1

Solution here:

import uuid

import dash
from dash.dependencies import Input, Output, State
import flask
from flask.helpers import send_file

import dash_core_components as dcc
import dash_html_components as html

stylesheets = [
    "https://cdnjs.cloudflare.com/ajax/libs/bulma/0.7.2/css/bulma.min.css", # Bulma
]

server = flask.Flask('app')

# create app
app = dash.Dash(
    __name__,
    external_stylesheets=stylesheets, 
    server=server                       # <-- do not forget this line
)

# (...) your code here

@server.route("/downloadable/")
def download_file (path = None):
    return send_file("downloadable/" + path, as_attachment=True)