Having exceptions is better than having silent bugs.
There are a few methods I've kept the same way they were.
The `RelatedContentScore#score_with_opposite` method is a bit peculiar:
it creates scores for both itself and the opposite related content,
which means the opposite related content will try to create the same
scores as well.
We've already got a test to check `Budget::Ballot#add_investment` when
creating a line fails ("Edge case voting a non-elegible investment").
Finally, the method `User#send_oauth_confirmation_instructions` doesn't
update the record when the email address isn't already present, leading
to the test "Try to register with the email of an already existing user,
when an unconfirmed email was provided by oauth" fo fail if we raise an
exception for an invalid user. That's because updating a user's email
doesn't update the database automatically, but instead a confirmation
email is sent.
There are also a few false positives for classes which don't have bang
methods (like the GraphQL classes) or destroying attachments.
For these reasons, I'm adding the rule with a "Refactor" severity,
meaning it's a rule we can break if necessary.
We were getting a 500 Internal Server Error because `find_by` returned
`nil`, but the code assumed it returned an object responding to
`encrypted_password`. In this case, maybe some other status code (like
400 or 401) might be more appropriate, but I've kept 404 because it was
easier to implement and I wasn't sure which one was better.
Also note ideally we would test the controller using:
expect(response).to have_http_status(:not_found)
However, we would need to configure the test to show exceptions and not
to consider all requests local. I haven't been able to do so for
controller tests, and doing so for feature/request specs seems to
require changes in the test environment configuration which would affect
other tests.
