Added skif check to create vote

docker/api/src/api/schema/mutation.cr

@@ -136,8 +136,19 @@ module API
       def create_vote(context : Context, input : VoteCreateInput) : Vote
         context.student!
 
-        if input.teacher_ids.any? { |id| Db::Teacher.find(id).nil? }
-          raise "Teachers not found"
+        skif = context.external.as(Db::Student).skif
+        input.teacher_ids.each do |id|
+          teacher = Db::Teacher.find(id)
+
+          if teacher.nil?
+            raise "Teachers not found"
+          elsif teacher.skif != skif
+            if teacher.skif
+              raise "Teacher is SKIF, student is not"
+            else
+              raise "Teacher is not SKIF, student is"
+            end
+          end
         end
 
         student = context.external.not_nil!.as(Db::Student)