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29 lines
768 B
29 lines
768 B
6 years ago
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class Ecs::CreateCourseManagerService < ApplicationService
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Error = Class.new(StandardError)
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COURSE_MANAGER_COUNT_LIMIT = 2 # 课程管理员数量限制
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attr_reader :ec_course, :user_id
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def initialize(ec_course, user_id)
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@ec_course = ec_course
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@user_id = user_id
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end
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def call
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user = User.find_by(id: params[:user_id])
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raise Error, '该用户不存在' if user.blank?
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if ec_course.ec_course_users.exists?(user_id: user.id)
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raise Error, '该用户已经是该课程的管理员了'
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end
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if ec_course.ec_course_users.count >= COURSE_MANAGER_COUNT_LIMIT
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raise Error, '该课程管理员数量已达上限'
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end
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ec_course.ec_course_users.create!(user: user)
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user
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end
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end
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