Jan Christophersen authored 7 years ago and James Lopez committed 7 years ago

Resolve "Projects API: filter 'with_issues_enabled=true' returns projects with 'issues_enabled=false'"

with .public_send we can't make sure that the scope on the model
actually exists.

This should reduce the number of SQL queries and lookups needed to look up a
project of a build and pipeline and vice versa.

Before:

```
[1] pry(main)> Ci::Build.reflect_on_association(:project).has_inverse?
=> false
[2] pry(main)> Project.reflect_on_association(:builds).has_inverse?
=> false
[3] pry(main)> Ci::Pipeline.reflect_on_association(:project).has_inverse?
=> false
[4] pry(main)> Project.reflect_on_association(:pipelines).has_inverse?
=> :project
```

After:

```
[1] pry(main)> Ci::Build.reflect_on_association(:project).has_inverse?
=> :builds
[2] pry(main)> Project.reflect_on_association(:builds).has_inverse?
=> :project
[3] pry(main)> Ci::Pipeline.reflect_on_association(:project).has_inverse?
=> :pipelines
[4] pry(main)> Project.reflect_on_association(:pipelines).has_inverse?
=> :project
```

with StrongMemoize

We'd need to keep track of project full path otherwise directory tree created with hashed storage enabled cannot be usefully imported using the import rake task.

This reverts merge request !15712

* new merge request can be created by sending an email to the specific
email address (similar to creating issues by email)
* for the first iteration, source branch must be specified in the mail
subject, other merge request parameters can not be set yet
* user should enable "Receive notifications about your own activity" in
user settings to receive a notification about created merge request

Part of #32878

Note the dependency on gitlab-shell v5.10.0

Comments from code review applied. Also switched forked_from_project and ForkedProjectLinks to ForkNetworkMember