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class CourseAttendance < ApplicationRecord
# mode: 0 两种签到， ，
belongs_to :course
belongs_to :user
has_many :course_attendance_groups , dependent : :destroy
has_many :course_member_attendances , dependent : :destroy
validates :name , presence : true
validates :mode , presence : true
validates :attendance_date , presence : true
validates :start_time , presence : true
validates :end_time , presence : true
after_create :generate_attendance_code
# 延迟生成邀请码
def attendance_code
return generate_attendance_code
end
# 生成邀请码
CODES = %W( 2 3 4 5 6 7 8 9 A B C D E F G H J K L N M O P Q R S T U V W X Y Z )
def generate_attendance_code
code = read_attribute ( :attendance_code )
if ! code || code . size < 4
code = CODES . sample ( 4 ) . join
return generate_attendance_code if CourseAttendance . where ( attendance_code : code ) . present?
update_attribute ( :attendance_code , code )
end
code
end
end
