There is a bug https://github.com/rails/arel/issues/531 in Rails 5.0 and
5.1 in Arel/ActiveRecord.
This commit converts arel based queries to their raw counterparts to
make the finder work in Rails 5.0.
These changes should be reverted when on Rails 5.2 as since that version
such queries work well again. See the bug link.
This applies the changes introduced in `Project.public_or_visible_to_user`
to the snippets finder only.
We know that for `SnippetsFinder`, this change improves SQL timing from
5/23/25s to 0.7/2/4s (mean/p95/p99). At the same time, the scope was too
broad, (negatively) affecting SQL timings in various other places:
https://gitlab.com/gitlab-com/infrastructure/issues/3772
With this commit, the snippets dashboard stays usuable as we generally
don't run into statement timeouts. In contrast to the earlier change in
!17088, the scope of the change is limited to `SnippetsFinder` only,
thus not affecting other places.
Immediately using #from here requires a lot of changes in
other finders (e.g. IssuableFinder, TodosFinder). In all places where we
use #merge, this goes completely the wrong way when passed in a relation
that was built with `#from(...)`: The original query's FROM part gets
completely replaced.
This avoids changing all other places and focuses on improving
SnippetFinder with the downside of two (small) codepaths to do the same
thing.
Adding the necessary API for the new /snippets Restful resource
added with this commit. Added a new Grape class `Snippets`, as
well as a `PersonalSnippet` entity.
Issue: #20042
Merge-Request: !6373
Signed-off-by: Guyzmo <guyzmo+gitlab+pub@m0g.net>
blackst0ne