+ ##
+ # returns true if the user has the moderator role, false otherwise
+ def moderator?
+ has_role? 'moderator'
+ end
+
+ ##
+ # returns true if the user has the administrator role, false otherwise
+ def administrator?
+ has_role? 'administrator'
+ end
+
+ ##
+ # returns true if the user has the requested role
+ def has_role?(role)
+ roles.any? { |r| r.role == role }
+ end
+
+ ##
+ # returns the first active block which would require users to view
+ # a message, or nil if there are none.
+ def blocked_on_view
+ active_blocks.detect { |b| b.needs_view? }
+ end
+