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psfpeqmhf/db/migrate/20200403113406_migrate_cour...

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class MigrateCourseAttendanceMember < ActiveRecord::Migration[5.2]
def change
course = Course.find_by(id: 5401)
if course.present?
course.course_attendances.each do |attendance|
course_group_ids = attendance.course_attendance_groups.pluck(:course_group_id)
students = course_group_ids.include?(0) ? course.students : course.students.where(course_group_id: course_group_ids)
none_students = students.where.not(user_id: attendance.course_member_attendances.pluck(:user_id))
none_students.each do |student|
CourseMemberAttendance.create!(user_id: student.user_id, course_member_id: student.id,
course_group_id: student.course_group_id, course_attendance_id: attendance.id, course_id: course.id)
end
end
end
end
end