Bug/65740 error when exporting wp table grouped by project phase

[EinLama]

Ticket

https://community.openproject.org/wp/65740

What are you trying to accomplish?

The PDF export breaks since the query generated by our project_phase_select uses an alias for a sub select. The export and other modules such as costs generate a query that surrounds the original query. The surrounding query expects a certain structure and does not work with generated aliases.

I tried coming up with multiple solutions to this issue:

• Get rid of the sub select alias by defining a scope on WorkPackage (or Phase). This fails since the group by query will only work with ActiveRecord associations.
• Set up a virtual table and define it as an association -> Could not get this to work properly.
• Define a view as a new association and use that for grouping/querying.
  • Works well for the most obvious parts. However, since inactive and invisible (to the user) phases should be treated like non-existing phases, a view cannot deliver the correct data, as the permission is determined on a per-request basis. Adding this additional rule afterwards is too late in the query. Attempts at resolving this later failed.
• ...

Merge checklist

• Added/updated tests
• Added/updated documentation in Lookbook (patterns, previews, etc)
• Tested major browsers (Chrome, Firefox, Edge, ...)