实训作业导出评语

app/helpers/export_helper.rb

@@ -179,7 +179,7 @@ module ExportHelper
         # 关卡评语
         shixun.challenges.pluck(:id).each do |challenge_id|
           challenge_comment = w.shixun_work_comments.select{|comment| comment.challenge_id == challenge_id}.first
-          row_cells_column << challenge_comment ? "学生可见：\n #{challenge_comment.comment.to_s} \n\n  老师可见：\n#{challenge_comment.hidden_comment.to_s}" : "--"
+          row_cells_column << challenge_comment.present? ? "学生可见：\n #{challenge_comment.comment.to_s} \n\n  老师可见：\n#{challenge_comment.hidden_comment.to_s}" : "--"
         end
 
         row_cells_column = row_cells_column.reject(&:blank?)