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56 lines
1.4 KiB
56 lines
1.4 KiB
6 years ago
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class BatchExportShixunReportService
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Error = Class.new(StandardError)
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MAX_BATCH_LIMIT = 20
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attr_reader :homework, :student_work_ids
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def initialize(homework, student_work_ids)
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@homework = homework
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@student_work_ids = student_work_ids
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end
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def filename
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@_filename ||= "#{Time.now.strftime('%Y%m%d%H%M%S')}-#{homework.name}.zip"
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end
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def zip
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validate!
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student_works = homework.student_works.where(id: student_work_ids).includes(:myshixun, user: :user_extension)
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if student_works.count.zero?
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raise Error, '请选择要导出的学生实训报告'
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end
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pdfs = []
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zip_file = Tempfile.new(filename)
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Zip::File.open(zip_file.path, Zip::File::CREATE) do |zip|
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student_works.find_each.map do |student_work|
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export = ExportShixunReportService.new(homework, student_work)
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pdf = export.to_pdf
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pdfs << pdf
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begin
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zip.add(export.filename, pdf.path)
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rescue => ex
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Rails.logger.error(ex.message)
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zip.get_output_stream('FILE_NOTICE.txt'){|os| os.write('文件重复') }
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next
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end
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end
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zip_file
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end
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end
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private
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def validate!
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if student_work_ids.size.zero?
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raise Error, '请选择学生实训作业'
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end
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if student_work_ids.size > MAX_BATCH_LIMIT
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raise Error, '导出实训报告太多，请分批导出'
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end
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end
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end
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