competition: fix

app/forms/competitions/save_team_form.rb

@@ -15,11 +15,15 @@ class Competitions::SaveTeamForm
 
   validate :check_teachers_enrollable
   def check_teachers_enrollable
-    if competition.teacher_enroll_forbidden? && teacher_ids.present?
+    if competition.teacher_enroll_forbidden? # 禁止老师报名
+      if teacher_ids.present?
         errors.add(:teacher_ids, :enroll_forbidden)
         return
       end
 
+      return if creator.is_teacher? # 因为创建者有单独校验，所以这里跳过
+    end
+
     self.teacher_ids = teacher_ids.map(&:to_i)
     all_teachers = creator.is_teacher? ? teacher_ids + [creator.id] : teacher_ids
     all_teachers.uniq!
@@ -43,11 +47,15 @@ class Competitions::SaveTeamForm
 
   validate :check_members_enrollable
   def check_members_enrollable
-    if competition.member_enroll_forbidden? && member_ids.present?
+    if competition.member_enroll_forbidden? # 禁止学生报名
+      if member_ids.present?
         errors.add(:member_ids, :enroll_forbidden)
         return
       end
 
+      return unless creator.is_teacher? # 因为创建者有单独校验，所以这里跳过
+    end
+
     self.member_ids = member_ids.map(&:to_i)
     all_members = creator.is_teacher? ? member_ids : member_ids + [creator.id]
     all_members.uniq!