class Ability def self.allowed(object, subject) case subject.class.name when "Project" then project_abilities(object, subject) else [] end end def self.project_abilities(user, project) rules = [] rules << [ :read_project, :read_issue, :read_snippet, :read_team_member, :read_note ] if project.readers.include?(user) rules << [ :write_project, :write_issue, :write_snippet, :write_note ] if project.writers.include?(user) rules << [ :admin_project, :admin_issue, :admin_snippet, :admin_team_member, :admin_note ] if project.admins.include?(user) rules.flatten end end