The Bing sitemap submission was removed in sitemap_generator 6.3.0 [1],
and Google has also deprecated the ping and we're getting an error when
deploying:
```
Ping failed for Google: #<OpenURI::HTTPError: 404 Sitemaps ping is
deprecated.
```
Since those were the only two search engines we were pinging in the
past, we're removing the code that did so.
[1] Pull request 408 in https://github.com/kjvarga/sitemap_generator
We were using the same logic in many different places, so we're
simplifying the code. I'm not convinced about the method names, though,
so we might change them in the future.
Note using this method for the default tenant in the `TenantDiskService`
class resulted in a `//` in the path, which is probably harmless but
very ugly and it also generates a different key than the one we got
until now. I've added an extra test to make sure that isn't the case.
Note that the `sitemap:refresh` task only pings search engines at the
end, so it only does so for the `Sitemap.default_host` defined last. So
we're using the `sitemap:refresh:no_ping` task instead and pinging
search engines after creating each sitemap.
Note we're pinging search engines in staging and preproduction
environments. I'm leaving it that way because that's what we've done
until now, but I wonder whether we should only do so on production.
Since we're creating a new method to get the current url_options, we're
also using it in the dev_seeds.
In the dev seeds, we were using `Setting["url"]/proposals`, but we can
use `proposals_url` instead, similar to what we do in the rest of the
application.
We can do a similar thing in the sitemap. This way the sitemap will also
work on installations who haven't manually set the "url" setting.
Since we aren't using `Setting["url"]` anywhere anymore, we're removing
it.
This setting was mainly redundant, since we already had the
`server_name` in the secrets. Furthermore, `server_name` is
automatically configured when running the installer, while
`Setting["url"]` had to be manually set in the admin section the
application was installed.
Note we're using `ActionMailer::Base` setting to generate URLs. Sounds a
bit strange, but it's a standard way Rails provides to generate URLs
outside the context of a request.
We were very inconsistent regarding these rules.
Personally I prefer no empty lines around blocks, clases, etc... as
recommended by the Ruby style guide [1], and they're the default values
in rubocop, so those are the settings I'm applying.
The exception is the `private` access modifier, since we were leaving
empty lines around it most of the time. That's the default rubocop rule
as well. Personally I don't have a strong preference about this one.
[1] https://rubystyle.guide/#empty-lines-around-bodies
