Rails 5.2 is raising a warning in some places:
DEPRECATION WARNING: Dangerous query method (method whose arguments are
used as raw SQL) called with non-attribute argument(s). Non-attribute
arguments will be disallowed in Rails 6.0. This method should not be
called with user-provided values, such as request parameters or model
attributes. Known-safe values can be passed by wrapping them in
Arel.sql().
IMHO this warning is simply wrong, since we're using known PostgreSQL
functions like LOWER() or RANDOM(). AFAIK this code works without warnings
in Rails 6.0 [1][2]
However, since the warning is annoying, we need to take measures so our
logs are clean.
[1] https://github.com/rails/rails/commit/6c82b6c99d
[2] https://github.com/rails/rails/commit/64d8c54e16
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
Using arrays made it difficult to order by more than one field (like the
`most_voted` scope does), and so we were ordering by `confidence_score`
and ignoring the `created_at` column.
Using an AR relation makes it easy to reuse the existing `most_voted`
scope.
This change has one side effect: now comments with equal votes are
ordered in descending order instead of having no specific order. That
means flaky specs which failed sometimes because they assumed comments
were ordered by date are now always green.
I've also re-added the `oldest` scope removed in 792b15b thinking it was
removed because using it with arrays was too hard.
