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80 lines
3.0 KiB
80 lines
3.0 KiB
5 years ago
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class Admins::StatisticSchoolContrastDataService < ApplicationService
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ParameterError = Class.new(StandardError)
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PAGE_SIZE = 20
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CONTRAST_COLUMN_LIST = %w(
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teacher_increase_count student_increase_count course_increase_count
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shixun_increase_count active_user_count shixun_homework_count shixun_evaluate_count
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).freeze
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attr_reader :params, :sort_direction, :contrast_column
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def initialize(params)
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@params = params
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@sort_direction = params[:sort_direction].to_s
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@contrast_column = params[:contrast_column].to_s
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end
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def call
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validate_parameter!
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reports = School.joins(:school_daily_reports).select(select_columns)
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keyword = params[:keyword].try(:to_s).try(:strip)
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if keyword.present?
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reports = reports.where("schools.name LIKE :keyword OR schools.id LIKE :keyword", keyword: "%#{keyword}%")
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end
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count = reports.count('distinct(schools.id)')
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sql = query_report_sql(reports.group('schools.id').to_sql)
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reports = SchoolDailyReport.find_by_sql(sql)
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[count, reports]
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end
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private
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def validate_parameter!
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if %i[begin_date end_date other_begin_date other_end_date].any? { |key| params[key].blank? }
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raise ParameterError
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end
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unless %w(desc asc).include?(sort_direction)
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raise ParameterError
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end
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unless CONTRAST_COLUMN_LIST.include?(contrast_column)
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raise ParameterError
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end
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end
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def format_date(date)
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Time.zone.parse(date).strftime("%Y-%m-%d")
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end
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def offset
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(params[:page].to_i.zero? ? 0 : params[:page].to_i - 1) * PAGE_SIZE
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end
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def select_columns
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if contrast_column != 'active_user_count'
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"schools.id school_id, schools.name school_name,"\
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"(SUM(IF(date BETWEEN '#{format_date(params[:begin_date])}' AND '#{format_date(params[:end_date])}', #{contrast_column}, 0))) total,"\
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"(SUM(IF(date BETWEEN '#{format_date(params[:other_begin_date])}' AND '#{format_date(params[:other_end_date])}', #{contrast_column}, 0))) other_total"
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else
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# 活跃用户对比时处理方法不同
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relations = SchoolDailyActiveUser.select('COUNT(distinct user_id)').joins(:school_daily_report)
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.where('school_id = schools.id')
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total_subquery = relations.where("date BETWEEN '#{format_date(params[:begin_date])}' AND '#{format_date(params[:end_date])}'").to_sql
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other_total_subquery = relations.where("date BETWEEN '#{format_date(params[:other_begin_date])}' AND '#{format_date(params[:other_end_date])}'").to_sql
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"schools.id school_id, schools.name school_name, (#{total_subquery}) AS total, (#{other_total_subquery}) AS other_total"
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end
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end
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def query_report_sql(from_sql)
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order_by = "(total = 0 AND other_total != 0) #{sort_direction}, (percentage != 0) #{sort_direction}, percentage #{sort_direction}"
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"SELECT reports.*, (other_total - total) increase, (IF(other_total - total = 0, 0.0, round((other_total - total) / IF(total = 0, 1, total), 5))) percentage "\
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"FROM (#{from_sql}) reports ORDER BY #{order_by} LIMIT #{PAGE_SIZE} OFFSET #{offset}"
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end
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end
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