管理员界面专业添加新的迁移

db/migrate/20170827023117_managements_zhuanye.rb

@@ -0,0 +1,12 @@
+class ManagementsZhuanye < ActiveRecord::Migration
+  def up
+    sql = "SELECT distinct(major_id) FROM `major_courses`"
+    MajorCourse.where("0=0").update_all(:support_shixuns, 0)
+    MajorCourse.find_by_sql(sql).each do |mc|
+      Major.where(:id => mc.try(:major_id)).first.update_column(:support_shixuns, 1)
+    end
+  end
+
+  def down
+  end
+end