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class Ecs :: CreateCourseManagerService < ApplicationService
Error = Class . new ( StandardError )
COURSE_MANAGER_COUNT_LIMIT = 2 # 课程管理员数量限制
attr_reader :ec_course , :user_ids
def initialize ( ec_course , user_ids )
@ec_course = ec_course
@user_ids = user_ids
end
def call
users_count = User . where ( id : user_ids ) . count
raise Error , '用户不存在' if users_count != user_ids . size
if ec_course . ec_course_users . exists? ( user_id : user_ids )
raise Error , '用户已经是该课程的管理员'
end
if ec_course . ec_course_users . count + user_ids . size > COURSE_MANAGER_COUNT_LIMIT
raise Error , " 课程管理员数量过多（最多 #{ COURSE_MANAGER_COUNT_LIMIT } ） "
end
ActiveRecord :: Base . transaction do
user_ids . each do | user_id |
ec_course . ec_course_users . create! ( user_id : user_id )
end
end
end
end
