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@ -1297,7 +1297,7 @@ class ExercisesController < ApplicationController
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if @user_course_identity > Course::ASSISTANT_PROFESSOR
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tip_exception(403,"无权限操作")
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else
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if @export_ex_users.exercise_user_committed.size == 0
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if (@exercise_users_size == 0) ||( @export_ex_users&.exercise_user_committed.size == 0)
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normal_status(-1,"暂无用户提交")
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else
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get_export_users(@exercise,@course,@export_ex_users)
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