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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 ) . where ( courses : { id : course_ids } ) . group ( " schools.id " ) . select ( " schools.*, count(courses.id) course_count " )
# name：
# 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 . find_in_batches do | s |
s . each do | school |
name = school . name
course_count = school . course_count
student_count = school . courses . joins ( :course_members ) . where ( course_members : { role : 4 , course_id : course_ids } ) . size
shixun_ids = school . courses . joins ( homework_commons : :homework_commons_shixun )
. where ( homework_commons : { id : homework_common_ids } )
. pluck ( " homework_commons_shixuns.shixun_id " )
choice_shixun_frequency = shixun_ids . size
choice_shixun_num = shixun_ids . uniq . size
course_info << { school_id : school . id , school_name : name , course_count : course_count , student_count : student_count ,
choice_shixun_num : choice_shixun_num , choice_shixun_frequency : choice_shixun_frequency }
end
end
course_info
end
end
