class CreateCourseMemberAttendances < ActiveRecord::Migration[5.2] def change create_table :course_member_attendances do |t| t.references :course_member, index: true t.references :user t.references :course, index: true t.references :course_attendance t.references :course_group, index: true t.integer :attendance_mode, default: 0 t.integer :attendance_status, default: 0 t.timestamps end add_index :course_member_attendances, [:course_attendance_id, :user_id], unique: true, name: "index_on_user_attendance" end end