Fix APPLICATION_ROOT example in docs

[aristocrates]

If the application is hosted on the path /somestring, static asset paths need to have prefix /somestring/static/ but setting APPLICATION_ROOT to "somestring" will result in a relative path which will give a 4XX. Using "/somestring" fixes this.

e.g. static assets should look like this in source:

<link rel="stylesheet" type="text/css" href="/somestring/static/css/main.css">

but without the leading slash they have href="somestring/static/css/main.css" which results in a network request for {DOMAIN}/somestring/{PROJECT_NAME}/somestring/static/css/main.css

The test suite includes the leading slash in test_prefixed:

ihatemoney/ihatemoney/tests/main_test.py

Lines 76 to 77 in 76e8b3b

	def test_prefixed(self):
	self.app.config["APPLICATION_ROOT"] = "/foo"

---

Also fix default value, which is "/" and not the empty string:

ihatemoney/ihatemoney/default_settings.py

Line 13 in 76e8b3b

APPLICATION_ROOT = "/"

ihatemoney/Dockerfile

Line 29 in 76e8b3b

APPLICATION_ROOT="/" \

ihatemoney/docker-compose.yml

Line 38 in 76e8b3b

- APPLICATION_ROOT=/

ihatemoney/ihatemoney/conf-templates/ihatemoney.cfg.j2

Lines 50 to 51 in 76e8b3b

	# Set this to a URL path under which the application will be served. Defaults to "/"
	APPLICATION_ROOT = "/"

ihatemoney/ihatemoney/tests/main_test.py

Line 72 in 76e8b3b

self.app.config["APPLICATION_ROOT"] = "/"

[almet]

Thanks, that looks good to me.

[aristocrates]

Thanks, I also added the s/If empty/By default/ change

[zorun]

Thanks for catching the doc issue.

From what I remember from last time I looked at this, the default value from Flask was an empty string. We merely force this to be / in all our example configs, see 3788b6f . But it seems I remember wrong: https://flask.palletsprojects.com/en/2.3.x/config/#APPLICATION_ROOT

By the way, this is all a hack, normally we are supposed to get this variable from the web server / runtime environment, and not define it ourselves. But anyway :)

In any case, this looks good to me!