|
|
class Subjects::CourseUsedInfoService < ApplicationService
|
|
|
attr_reader :subject
|
|
|
def initialize(subject)
|
|
|
@subject = subject
|
|
|
@shixun_ids = subject.shixuns.pluck(:id)
|
|
|
end
|
|
|
|
|
|
def call
|
|
|
return if subject.blank?
|
|
|
homework_commons =
|
|
|
HomeworkCommon.joins(:homework_commons_shixun)
|
|
|
.where(homework_type: %i[practice])
|
|
|
.where(homework_commons_shixuns: {shixun_id: @shixun_ids})
|
|
|
course_ids = homework_commons.pluck(:course_id)
|
|
|
homework_common_ids = homework_commons.pluck("homework_commons.id")
|
|
|
schools = School.joins(courses: [:course_members, :homework_commons])
|
|
|
|
|
|
# name：将该课程使用到课堂的单位
|
|
|
# course_count: 将该课程使用到课堂的数量
|
|
|
# student_count: 课堂的学生总数（去掉重复）
|
|
|
# choice_shixun_num: 选用该课程实训的个数（去重）
|
|
|
# choice_shixun_frequency: 选用该课程实训的次数
|
|
|
course_info =
|
|
|
schools.map do |school|
|
|
|
name = school.name
|
|
|
course_count = school.where(courses: {id: course_ids}).count
|
|
|
student_count = school.where(course_members: {role: 4}).select("course_members.user_id").distinct.size
|
|
|
homework_commons = school.where(homework_commons: {id: homework_common_ids})
|
|
|
.select("homework_commons.id")
|
|
|
choice_shixun_num = homework_commons.distinct.size
|
|
|
choice_shixun_frequency = homework_commons.size
|
|
|
{name: name, course_count: course_count, student_count: student_count, choice_shixun_num: choice_shixun_num,
|
|
|
choice_shixun_frequency: choice_shixun_frequency}
|
|
|
end
|
|
|
# 默认按照选用实训的次数作为排序
|
|
|
course_info.sort{|x,y| y['choice_shixun_frequency'] <=> x['choice_shixun_frequency']}
|
|
|
end
|
|
|
|
|
|
end
|
|
|
|
