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class CourseAttendance < ApplicationRecord
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# mode: 0 两种签到，1 二维码签到，2 数字签到
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belongs_to :course
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belongs_to :user
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has_many :course_attendance_groups, dependent: :destroy
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has_many :course_member_attendances, dependent: :destroy
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validates :name, presence: true
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validates :mode, presence: true
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validates :attendance_date, presence: true
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validates :start_time, presence: true
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validates :end_time, presence: true
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after_create :generate_attendance_code
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# 延迟生成邀请码
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def attendance_code
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return generate_attendance_code
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end
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# 生成邀请码
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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)
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def generate_attendance_code
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code = read_attribute(:attendance_code)
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if !code || code.size < 4
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code = CODES.sample(4).join
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return generate_attendance_code if CourseAttendance.where(attendance_code: code).present?
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update_attribute(:attendance_code, code)
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end
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code
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end
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end
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