You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
29 lines
768 B
29 lines
768 B
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_id
|
|
|
|
def initialize(ec_course, user_id)
|
|
@ec_course = ec_course
|
|
@user_id = user_id
|
|
end
|
|
|
|
def call
|
|
user = User.find_by(id: params[:user_id])
|
|
raise Error, '该用户不存在' if user.blank?
|
|
|
|
if ec_course.ec_course_users.exists?(user_id: user.id)
|
|
raise Error, '该用户已经是该课程的管理员了'
|
|
end
|
|
|
|
if ec_course.ec_course_users.count >= COURSE_MANAGER_COUNT_LIMIT
|
|
raise Error, '该课程管理员数量已达上限'
|
|
end
|
|
|
|
ec_course.ec_course_users.create!(user: user)
|
|
|
|
user
|
|
end
|
|
end |