competition error message

app/forms/competitions/save_team_form.rb

@@ -39,9 +39,9 @@ class Competitions::SaveTeamForm
 
     # 存在已报名老师
     enrolled_teacher_members = competition.team_members.where(user_id: all_teachers)
-                                 .where.not(competition_team_id: team.id).includes(:user)
+                                 .where.not(competition_team_id: team.id).pluck(:user_id)
     if enrolled_teacher_members.present?
-      errors.add(:teacher_ids, :enrolled, names: enrolled_teacher_members.map { |m| m.user.real_name }.join('，'))
+      errors.add(:teacher_ids, :enrolled, names: User.where(id: enrolled_teacher_members).map(&:real_name).join('，'))
       return
     end
   end
@@ -72,9 +72,9 @@ class Competitions::SaveTeamForm
 
     # 存在已报名成员
     enrolled_members = competition.team_members.where(user_id: all_members)
-                         .where.not(competition_team_id: team.id).includes(:user)
+                         .where.not(competition_team_id: team.id).pluck(:user_id)
     if enrolled_members.present?
-      errors.add(:member_ids, :enrolled, names: enrolled_members.map { |m| m.user.real_name }.join('，'))
+      errors.add(:member_ids, :enrolled, names: User.where(id: enrolled_members).map(&:real_name).join('，'))
       return
     end
   end