Question

Sorry if this is a simple question, I haven’t had much luck with the search terms I’ve been using…

In my rails 3 project I have the models Project, User and UserProjectRole.

a User has many Projects, as well as a role for each project that is defined in UserProjectRole (which contains a user_id, project_id, and role).

There are 2 roles: editor and lead.

If I want to group the list of projects so current_user sees the projects they lead listed first, the projects they can edit listed second, and the projects for which they have no role listed last, how can I do this?

Thanks in advance.

Answer 1

Here is one method:

select project, decode(sort, 1, 'LEAD', 2, 'EDITOR', 'Not Assigned') role
from (
select project, role, case when user_id = <current_user_id> and role = 'LEAD' then 1
                           when user_id = <current_user_id> and role = 'EDITOR' then 2
                           else 3 end sort
from UserProjectRole
) order by sort, project;