Create a universal `url_4` that works across dash and flask

[aaron-schroeder]

The dash page registry is kind of a black box to me. Where it's accessible, how it stores its routing information, etc. But I think it holds the key to writing a function that can serve as a combination of url_for and

For dash page routing, I have stuck to mostly hardcoding route urls, with a small amount of hacky uses of the dash page registry.

Example entry in dash.page_registry ordered dict:

(pages.training_stress, {'module': 'pages.training_stress', 'supplied_path': None, 'path_template': '/stress', 'path': '/stress', 'supplied_name': 'Training Stress Dashboard', 'name': 'Training Stress Dashboard', 'supplied_title': 'Training Stress Dashboard', 'title': 'Training Stress Dashboard', 'description': '', 'order': None, 'supplied_order': None, 'supplied_layout': None, 'supplied_image': None, 'image': None, 'image_url': None, 'redirect_from': None, 'relative_path': '/stress', 'layout': <function layout at 0x7faaf6c1b700>}

References

• Flask routing
  • https://flask.palletsprojects.com/en/2.2.x/api/#flask.Flask.url_for
  • https://flask.palletsprojects.com/en/2.2.x/api/#flask.url_for
• Dash Pages routing
  • https://github.com/plotly/dash/blob/dev/dash/dash.py#L2066-#L2068
  • https://github.com/plotly/dash/blob/47a7acb05114543cf5feb2b41666c765bcd32b1e/dash/dash.py#L2027-#L2038