"assignable?" is just a filter to select roles that have attribute
"assignable" set to true.
Regarding roles... I want to select not all roles, but roles that are
members of project. And also I cannot change database structure. So I
have the following entities relations:
Roles <- Members -> Projects
|
\ /
Users
Unfortunately I don't know how to select (using RoR) unique roles that
regard only defined project.
In SQL it looks like:
SELECT Roles.id, Roles.name
FROM Roles, Members
WHERE Members.project_id=5
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