外键问题

app/models/user.rb

@@ -43,7 +43,7 @@ class User < ApplicationRecord
   has_many :myshixuns, :dependent => :destroy
   has_many :study_shixuns, through: :myshixuns, source: :shixun   # 已学习的实训
   has_many :course_messages
-  has_many :courses, dependent: :destroy
+  has_many :courses, foreign_key: 'tea_id', dependent: :destroy
 
   #试卷
   has_many :exercise_banks, :dependent => :destroy